Viscoelastic Fluid Flow Through 3D Square-Square Expansions

P. C. Sousa", P. M. Coelho^ M. S. N. Oliveira' and M. A. Alves'

"Faculdade de Engenharia da Universidade do Porto, Departamento de Engenharia Quimica, CEFT, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal

Faculdade de Engenharia da Universidade do Porto, Departamento de Engenharia Mecdnica, CEFT, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal

Abstract. In this work we present an experimental study of the 3D laminar flow of Newtonian and Boger fluids through square-square expansions with expansion ratios of 1:2.4, 1:4, 1:8 and 1:12. Visualizations of the flow patterns were performed using streak line photography and the velocity field of the flow was measured in detail using Particle Image Velocimetry (PIV). The experimental results obtained with the Newtonian fluid are compared with numerical predictions. The numerical code used is based on a Finite-Volume method and an excellent agreement is found between experimental and numerical results. For all expansion ratios studied, a Moffatt comer vortex is observed downstream of the expansion and an increase in the flow inertia leads to an enhancement of the vortex size. On the other hand, the viscoelastic fluid flow also reveals the existence of a comer vortex downstream of the expansion, which decreases in size and strength when the Deborah number is increased. The vortices in square-square expansion flows exhibit a three-dimensional structure evidenced by a helical flow, which is well predicted by numerical simulation in the Newtonian fluid flow case.

Keywords: Square-Square Expansion; Flow Visualization; Particle Image Velocimetry; Boger Fluid PACS: 47.50.Ef, 83.50.Jf, 47.80.Jk, 47.80.Cb

INTRODUCTION

The square-square (SQ/SQ) geometry is an useful arrangement to study three-dimensional flow behavior. Due to its geometrical simplicity allied to the inherent complex 3D flow patterns [1,2], it can be set as an interesting test-case for validation of 3D numerical codes.

The viscoelastic fluid flow through this geometry, acting as a contraction, reveals different flow patterns (vortex growth, diverging flow and unstable flow), depending on the Deborah number [1-3] for a contraction ratio of 4. For other contraction ratios Sousa et al. [4] analyzed the effect of the contraction ratio upon the flow patterns of a Newtonian and a Boger fluid and showed that in the viscoelastic case, at high contraction ratios and high De, localized diverging streamlines appear near the contraction entrance. Oppositely, in the viscoelastic flow through square-square expansions the flow patterns are similar for all De studied and the vortex size decreases with an increase of fluid elasticity [2]. In contrast, the expansion flow of a Newtonian fluid presents an increase of the vortex size with increasing inertia (flow rate).

In this paper, we present an experimental study of a Newtonian and a Boger fluid flowing through square-square abrupt expansions. Moreover, we investigate the effect of the expansion ratio on the flow patterns. The results obtained with the Newtonian fluid are compared with numerical predictions in order to validate the experimental technique.

EXPERIMENTAL AND NUMERICAL TECHNIQUES

A Newtonian and a Boger fluid were used in the experiments. Their composition and densities are presented in

CP1027, The XV^'' International Congress on Rheology, The Society ofRheology 8(f Annual Meeting edited by A. Co, L. G. Leal, R. H. Colby and A. J. Giacomm

O2008 American Institute of Physics 978-0-7354-0549-3/08/$23.00

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Table 1. The fluids used in the experiments were characterized rheologically using a shear rheometer (Anton Paar, model Physica MCR301). For the Newtonian fluid, only steady shear measurements were made and the shear viscosity obtained at 20.0 °C was t] = 0.0982 Pa-s.

Fluid Newtonian

Boger

TABLE 1. Composition and properties of the test fluids, at 20 °C. PAA[ppm] Glycerin [%] Water [%] Kathon [ppm] NaCl [%]

84.99 15.01 24.5 100 90.96 7.52 24.8 1.5

P [kg/m ]̂ 1221 1249

For the viscoelastic fluid, dynamic shear measurements were also performed. The shear viscosity of the Boger fluid is 0.447 Pas and the relaxation time is A= 3.285 s, both at 20.0 °C. Further details of the steady and dynamic measurements carried out for the Boger fluid are described in [4].

The channel used in the experiments is made of transparent acrylic and is composed of two parts: the downstream square duct with a fixed size oflHj = 24 mm, and the upstream square duct with a size, 2Hi, that was varied, in order to obtain the desired expansion ratios, ER = Hj/Hi.

Visualization of the flow patterns were carried out through streak line photography and the velocity field was measured using Particle Image Velocimetry (PIV). In order to perform the optical experiments, the fluids were seeded with 10 ixm PVC tracer particles in a concentration of approximately 30 ppm. In streak line photography, the plane of the flow under study was continuously illuminated using a 532 nm 3 mW laser diode (Imatronic, model LLM115) or a 635 nm 5 mW laser diode (Vector, model 5200-20), depending on the flow rate ranges. The images were captured using a Canon EOS 30D digital camera equipped with a macro lens (Canon EFlOOmm, f/2.8) and the exposure time was adjusted depending on the flow conditions, ranging from ^ (1 s) to ^ (10^ s). In the velocity field measurements, the flow plane under investigation was illuminated using a double pulsed Nd:YAG laser (Solo PIV III from New Wave Research) and the images were acquired through a digital CCD camera (Flow Sense 2M from Dantec Dynamics coupled with a Nikon AF Micro 60 mm lens). FlowManager v4.60 software (Dantec Dynamics) was used to acquire and process the images.

The experimental results obtained with the Newtonian fluid were simulated numerically using a finite-volume method. Details of the numerical technique and the meshes used in the simulations are described elsewhere [5].

RESULTS AND DISCUSSION

The effect of inertia on the Newtonian fluid flow behavior is similar for all expansion ratios studied. The Reynolds number is defined asRci = pUi(2IIi)/r], where U-i is the average axial velocity in the upstream square channel of width IHi. At low Reynolds numbers, a Moffatt comer vortex is observed near the comer. Increasing Re leads to an increase of the vortex length, defined as the distance from the expansion plane to the top of the recirculation. In Figure 1 a) and b) we present experimental and numerically obtained streak line images at the center plane of the square channel for ER = 4 and 8, respectively, showing that the experimental results are well captured by the numerical predictions. To further attest this, in Figure 1 c), we compare experimental and numerical axial velocity profiles along the centerline. Note that near the expansion plane (x/(2//i) = 0), some experimental points are not represented because, during the PIV experiments, when the laser light sheet illuminates the measuring plane of the square duct, there was a shade upstream the expansion plane which leads to a reduction of the visibility of tracer particles, and therefore to a significant reduction of the precision of the PIV results in this region of the flow. Once again, the experimental results are in good agreement with those obtained from numerical simulations.

Figure 2 a) and b) show the flow patterns of the Boger fluid at two different ER. The Deborah number is defined as Dei ^ AUilHi. Comparing the flow of the Boger fluid to the corresponding flow observed for a shear-thinning fluid through a 1:4 square-square expansion [2], we found several similarities. For all ER studied, the viscoelastic fluid flow presents a comer vortex downsfream of the expansion plane. Increasing De leads to a decrease of the comer vortex length, which is in agreement with the findings of Alves [2] for a shear-thinning fluid. Figure 2 c) compares the axial velocity profile along the centerline for two different Dei values using the Boger fluid, where it is clear that a large difference in Dei does not influence significantly the velocity profiles along the centerline, which are also similar to those predicted for a Newtonian fluid under creeping flow conditions.

277

a) b) FIGURE 1. Streak lines of the Newtonian fluid flow at the center plane of the square-square expansion for:

a) Rei = 0.746 and ER = 4; b) Rei = 13.9 and ER = 8. c) Axial velocity profile along the centerline for Rei = 3.02.

ER = 4 ER = S

Dei = 4.91

De, = 80.3

Dei = 33.3

Boger fluid ER = 4

• De^ = 18.7 A De^ = 85.5

Newtonian

Dei= 92.7 X/(2H)

c) FIGURE 2. Streak line images of the Boger fluid at a) ER =4 and b) ER = 8; c) Axial velocity profiles taken along

the centerline for the Boger fluid.

A detailed investigation of the flow at several planes from the center plane to the wall of the channel was also carried out. The results obtained, not shown here due to space limitations, demonstrate that the flow through a square-square expansion is highly three-dimensional in nature and exhibits a complex open vortical structure. A detailed description of this flow behavior was reported previously for a 1:4 SQ/SQ expansion [2].

ACKNOWLEDGMENTS

The authors acknowledge the financial support from FEDER and FCT through projects PPCDT/EME/59338/ 2004 and PTDC/EQU-FTT/71800/2006. P.C. Sousa also acknowledges FCT through scholarship SFRH/BD/28846/ 2006.

REFERENCES

1. M. A. Alves, F. T. Pinho and P. J. Oliveira, AIChE J. 51, 2908-2922 (2005). 2. M.A. Alves, "Laminar Flow of Viscoelastic Fluids: Numerical, Theoretical and Experimental Analysis" (in Portuguese),

Ph.D. Thesis, University of Porto, 2004. 3. S. C. Xue, N. Phan-Thien and R. I. Tanner, /. Non-Newt. FluidMech. 74, 195-245 (1998). 4. P. C. Sousa, P. M. Coelho, M. S. N. Oliveira and M. A. Alves, "Viscoelastic Fluid Flow In Three-Dimensional

Square-Square Contractions", edited by J. Davis et al., 2007 AIChE Annual Meeting, American Institute of Chemical Engineering, New York, 2007.

5. P. C. Sousa, P. M. Coelho, M. S. N. Oliveira and M. A. Alves, "Three-dimension laminar flow in square/square contractions", edited by J. C. Sa et al., 2007 CMNE/CILAMCE Conference, APMTAC/FEUP, Porto, 2007.

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Welcome ScreenTitle PageProceedingsISBN/Copyright InformationPrefaceEditor's NoteContentsPART ONEMATERIALS PROCESSINGORAL PRESENTATIONSTransient Solutions of Nonlinear Dynamics in Film Blowing Accompanied by Flow-Induced CrystallizationOn the Interaction of an Air Jet with a Viscoelastic Tubular Film Produced During the Film Blowing ProcessModeling of Crystallizing Polymer Melts in ElectrospinningRheological and Film-Casting Properties of Well-Characterised Polyethylenes with Different Branching StructureEffects of Process Condition and Material Properties on Replication and Structural Development in Thermal Nano-ImprintingTransient Coating of the Inner Wall of a Straight Tube with a Viscoelastic MaterialCracking in Drying Silica-Polymer Films: Morphology TransitionsThe Effect of PVA Adsorption on Stress Development during Drying in PVA/Silica Suspension CoatingRheology and Wetting Properties of Fluxes for Flip Chip PackagesModeling of the Stress Distribution of the Pressure Sensitive Adhesive in the Multi-Layered StructuresExtruded Proton Exchange Membranes Based on Sulfonated Polyaromatic Polymers for Fuel Cell ApplicationHigh Strain Rate Rheometry of Polymer Melts Using an Instrumented Injection Molding MachineIn Situ X-Ray Scattering Measurements and Polydomain Simulations of Molecular Orientation Development during Injection Molding of Liquid Crystalline PolymersSimulation of Orientation in Injection Molding of High Aspect Ratio Particle Thermoplastic CompositesNumerical Study on the Impact of Additives on Shrinkage of Injection Molded PolypropyleneOn the Study of the Die Swell of Pure and Filled Linear PolystyreneCorrelations between High-Density Polyethylene Viscoelasticity and Annular Extrudate SwellUsing Hollow Microcapillaries to Explore the Extrusion Rheology of Polymer FilmsRheology at the Interface and the Role of the Interphase in Reactive Functionalized Multilayer Polymers in Coextrusion ProcessEffect of Polymer Processing Aids (PPAs) on the Elimination of Sharkskin Defect in LLDPE Extrusion: Influence of Die SurfacingImpact of Elasticity on Lubrication: Esters of PEG, Silanol and Their Blends as Polymer Processing AdditivesSimultaneous Determination of Electrical and Rheological Properties of Polypropylene Filled with Carbon NanotubesNew Approach of Ultrasonic Blend Process on PP/PC and Its NanocompositesImpact of Rheology on Meltblown Polymer NanofibersEpoxy/montmorillonite Nanocomposite Systems: Effect of the Dispersion Method and the Clay Modification on the Rheological Parameters of the Curing ProcessInterplay of Inertia and Elasticity, Enhanced Heat Transfer and Change of Type of Vorticity in Noncircular Tube Flow of Nonlinear Viscoelastic FluidsPlanar Extensional Viscosity of Polystyrene and Polystyrene/CO2 SolutionNumerical Simulation and Application Research on the Effect of Temperature for Deep-Drawing of TC1 Ti Alloy SheetInfluence of Cellulosic Nanofillers on the Rheological Properties of Polymer ElectrolytesShear Rheology of Suspensions of Porous Zeolite Particles in Concentrated Polymer SolutionsThe Squeeze Flow of Yield Stress FluidsExtrusion Criterion for Firm Cement-based MaterialsRheology of Carbon Black Suspensions: Effect of Carbon Black StructureThe Rheology of Optically Transparent Polystyrene Blends Filled with Cross-Linked Polystyrene BeadsA Study of the Rheology, Processing and Flow Induced Mesostructures of Glass Bead Filled PolystyreneThe Behavior of Particle Agglomerate in a Newtonian Molten Polymer in the Dispersion and Re-Agglomeration ProcessesStudies for Polyblend Behaviour in Screw Extrusion and Injection Molding ProcessesThe Rheology and Processing of Renewable Resource PolymersDeformation and Rheology of Co-Continuous BlendsIn-Situ Structural Characterization by SAXS and Flow Properties of Colloidal Suspensions during Cross-flow UltrafiltrationStability of the Annular Poiseuille Flow of a Newtonian Liquid with Slip along the WallsStability of Shear-Extensional Flow in Film Extrusion of Liquid Crystalline Polymer-Anisotropic Viscoelastic Fluid

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POSTERSShear Induced Chain Migration in Flowing Polymeric Solutions: A Molecular Dynamics StudyComponent Dynamics in Polystyrene/4-Pentyl-4/-Cyanobiphenyl BlendRheology and Adhesive Performance of Soft Polymer NetworksViscoelastic Behavior of Aqueous Solutions of Hydrophobically-Modified Water-Soluble PolypeptidesEffect of Hyaluronic Acid on the Self-Assembling Behaviour of PEO-PPO Copolymers in Aqueous SolutionGelation of Regenerated Fibroin Solution

BIO-RHEOLOGYORAL PRESENTATIONSLittle Shop of Horrors: Rheology of the Mucilage of Drosera sp., a Carnivorous PlantA Viscoelastic Deadly Fluid in Carnivorous Pitcher PlantsViscoelastic Properties of Sodium Hyaluronate SolutionsTextural Properties of Agarose Gels Described by FT-RheologyVinculin Contributes to Cell Invasion by Regulating Contractile ActivationModeling the Vortical Structures in Hemodynamics of Small Vessels and CapillariesRheometrical Studies of Blood Clot Formation by Oscillatory Shear, Thromboelastography, Sonoclot Analysis and Free Oscillation RheometryStress Analysis of Shear-Thinning Synovial Fluid FlowA Numerical Model of Viscoelastic Layer Entrainment by Airflow in CoughHigh Resolution MR-Elastography: A Unique Tool to Study the Rheological Properties of Tissue in Vivo and the Origin of Its Multiscale BehaviourTransient Extensional Rheology of an Aqueous Gelatin Solution: Before and during GelationDissipative Particle Dynamics Simulation of Polymer-amd Cell-Wall Depletion in Micro-Channels

POSTERSPreparation and Shear Modulus of Polyacrylamide Gels as Nerve Cell CultureRheology and Gelation Temperature of Aqueous Gelatin and Sodium Alginate SolutionsCharacterizing the Non-Linear Rheology of Biopolymer Networks Using Inertio-Elastic OscillationsSuperdiffusive Motion with Fractional Power-Law ExponentsThe Measurement of Thickened Liquids Used for the Management of DysphagiaAlkali and Acid Solubilization Effects on Rheological Properties of Horse Mackerel Muscle ProteinsBlended Solutions of Celluloses from Different Biological OriginsOcean Rheology and Plankton Biology

SUSPENSIONS AND COLLOIDSORAL PRESENTATIONSNumerical Simulations of Suspensions of Elastic Particles in Polymer MeltsMolecular Hydrodynamics in Nanoparticle SuspensionsRotation of a Sphere in a Viscoelastic Fluid under FlowElectrokinetic Boundary Condition Compatible with the Onsager Reciprocal Relation in the Thin Double Layer ApproximationModel Analysis on Dispersion Characteristics of Fine Particles in Newtonian Molten PolymerAnisotropic Diffusion Model for Suspensions of Short-Fiber Composite ProcessesSpherical Harmonic Solutions of Fiber Orientation Probability Distributions for Composite ProcessesDirect Numerical Simulation of Carbon Nanofiber Composites in Simple Shear FlowRheology and Extrusion of Cement-Fly Ashes PastesMulti-Scales Analysis to Study the Rheological Behavior of Natural Mud SuspensionsSuspensions of Noncolloidal Particles in Yield Stress Fluids: Experimental and Micromechanical ApproachesTheory of Thermodynamic Stresses in Colloidal Dispersions at the Glass TransitionStress Chains Formation under Shear of Concentrated SuspensionDynamics of Transient Vorticity-Aligned Structures and Internal Stresses in Shear Thickening Colloidal GelsExtreme Velocity Fluctuations: Transient Jamming in Concentrated Suspension FlowTransient Study on the Shear Thickening Behaviour of Surface Modified Fumed Silica Suspensions in Polypropylene GlycolImplementing the Split-Hopkinson Pressure Bar Technique for Shear Thickening Fluid EvaluationControlling Suspension Rheology with Novel Oligomeric DispersantsVery Concentrated Plate-Like Kaolin Suspensions under Large Amplitude Oscillatory Shear: A Microstructural ApproachTransition Pathways between Solid and Liquid States of Dense Suspensions in Transient and Oscillatory Shear FlowsMicrorheological Origins of the Irreversible Flow of SuspensionsThe Coagulated Behavior of Latex Particles in a Seed CoagulationFundamental Pair Interactions and Applications for Colloidal Silica Particles by Coarse-Grained SimulationsInfluence of Thixotropy on Pressures Required during Pumping of ConcreteTransition from a Simple Yield Stress Fluid to a Thixotropic MaterialComparative Study of Particle Interaction between PMMA Particles by Usui/s Thixotropy Model and AFMEffect of Latex Particles Addition on the Rheological Behavior of Concentrated Silica Suspensions Used as Cement Pastes Model SystemsThe Dynamic Behavior of a Concentrated Non-Brownian Glass Fiber Suspension in Simple Shear FlowRheology of Semi-Flexible Fiber SuspensionsEffects of Matrix Viscoelasticity on Rheology of Dilute and Semi-Dilute Suspensions of Non-Brownian Rigid SpheresParticle-Wall Interaction in a Viscoelastic FluidTracer Diffusion in a Soft Glassy MaterialFlow of Dense Granular Suspensions on an Inclined PlaneShear Stress Measurements of Non-Spherical Particles in High Shear Rate FlowsAn Experimental Investigation of Bubble Rise Characteristics in a Crystal Suspended Non-Newtonian FluidViscosity of a Suspension with Internal RotationsThe Response of Elongated Particles under Shear and Electric FieldsThe Rheology of Carbon Nanotube (CNT) Suspensions: Experiments and ModellingRheological Behavior of Polyamide-6 Based Nanocomposites: Experimental Study and Modeling

POSTERSRheological Influence of Synthetic Zeolite on Cement PastesInfluence of Water Content on the Flow Behavior of PVC PlastisolsRheology of Nanoparticle Suspensions in Hydroxypropylcellulose (HPC) SolutionsExtensional Flow and Electric Conductivity of Carbon Nanotube Dispersed SystemRheological Properties of Binary Suspensions TiO2 / Al2O3: Effect of Ionic StrengthRheological Properties and Transfer Phenomena of NanofluidsImpact and Spreading of a Particle-Laden Drop on the Solid SubstrateSAXS Studies on the Agglomerative Silica Suspension under ShearThe Concentration Effect on the Rheological Behavior of Bauxite SlurryRheological Behavior of an Epoxy Resin with Hollow Glass MicrospheresInteractions between Aggregated Particles in Stokes FlowDynamic and Steady Shear Properties of Reversibly Cross-Linked Guar Solutions and Their Effects on Particle Settling BehaviorRheological Behavior of Silica Suspensions in Aqueous Solutions of Associating PolymerElectrorheology of Poly (Ethylene Glycol) SuspensionRheological/Morphological Study of PS/CNT Nanocomposite Electrospun FibersEffect of Composite Ceramic Paste Velocity Profile on Extrudate MicrostructureShear Induced Alignment of Multi-Walled Carbon Nanotube Dispersions via Small Angle X-Ray ScatteringRelationship between the Rheological and the Adhesive Properties of Cementitious PastesRheology of Polyurethane Nanocomposite Films Containing Different Nanofillers Prepared from Homogeneous Aqueous Solution PolymerizationOnset of the Rheological Fluid Behavior in High Concentrated SuspensionsSqueezing Flow of Suspensions: Flow Regime Evaluation from Energy ApproachThe Structure Control of Catalyst Layer for Polymer Electrolyte Fuel Cell by the Preparation Condition of Catalyst Particle Suspension

PART TWOSURFACTANTS, EMULSIONS, AND FOAMSORAL PRESENTATIONSRheological Characterization of Foamy Oils under PressureFoam Structure and Rheology in Thin GapsFoam Rheology in Two DimensionsLocalization of Topological Changes in Couette and Poiseuille Flows of Two-Dimensional FoamsEffects of Film Elasticity and Surface Forces on the Stability of Foams and Lamellae Films in the Presence of Non-ionic SurfactantsMeasurements of Wall Slip during Rise of a Physically Blown FoamGas Permeability of Foam Films Stabilized by an Alpha Olefin Sulfonate (AOS) SurfactantsMorphology and Rheology of PolymerÕLiquid Crystal BlendsObservation of Shear Flow for Surfactant Solutions with a Rheometer of Cone and Plate TypeFlow of Viscoelastic Wormlike Micelle Solutions through a Periodic Array of CylindersNanoparticle Associated Surfactant Micellar FluidsMulti-Mode Relaxation Behavior of Drag-Reducing Surfactants with Excess Addition of Counter-IonsExtensional Rheology of Branched Wormlike Micelle SolutionsRelating Viscosity Changes to Phase Inversion during the Synthesis of Tackifier EmulsionsIn Situ Formation and Evolution of Gas Hydrates in Water-in-Oil Emulsions Using Pressure RheometryDeformation and Relaxation of PMMA/PS and PMMA/PSOX BlendsNumerical Simulation of the Deformation and Break-Up of Droplets Subjected to Complex, Time Dependent Strain RatesEvidence of Droplet Coalescence in Extensional Flow Using Microfluidic DevicesMorphology and Rheology of Model Immiscible Blends with Interfacial Crosslinking

POSTERSNumerical Modeling of Ferrofluid Droplets in Magnetic FieldsViscoelasticity and Crystallization of PC/mPP Nanoblends Prepared via In Situ Polymerization and CompatiblizationThermo-Gelation of Surface-Modified Polyethylene Microgels from Fragmentation and Immiscible BlendsInvestigation on Drop Formation Process by CaBER /Hanging Drop/ ExperimentsThree-Dimensional Numerical Simulations of a Rising Bubble in a Viscoelastic FENE-CR Model FluidA Look behind the Salt Curve: An Examination of Thickening Mechanisms in Shampoo FormulationsTheoretical Model of Viscous Friction inside Steadily Sheared Foams and Concentrated EmulsionsThermal, Morphological and Rheological Properties of Rigid Polyurethane Foams as Thermal Insulating Materials

GRANULAR MATERIALS AND AGINGORAL PRESENTATIONSFluctuations and Response in Granular Gases: Validity and Failure of Einstein RelationDoes the Chapman-Enskog Expansion for Viscous Granular Flows Converge?Segregation in Moderately Dense Granular Binary MixturesRheology of Dense Sheared Granular FlowsExperimental Study of the Freely Evolving Granular Gas under Microgravity ConditionFluid Injection into Granular Media under ConfinementRheophysical Investigation in Concentrated Particle SuspensionsDensification of a 3D Granular Bed by Horizontal VibrationsInitiation of Submarine Granular Avalanches: Role of the Initial Volume FractionDense Granular Flows: Rheology and SegregationA Dissipative Coulomb Model for Dense Granular FlowsDirect Numerical Simulation of Polygonal Particles Sedimentation with CollisionsShear Flow of Sphere Packings in the Geometric LimitFlow and Blockage of Concentrated Granular Suspensions

POSTERSRheological Properties of a Granular Impurity in the Couette Flow

MICROFLUIDICSORAL PRESENTATIONSUse of Stagnation Point Flows for DNA Trapping, Manipulation, and Target Sequence DetectionElongation Deformation of DNA Polymers in Micro FlowConformation and Diffusion of a Single Polyelectrolyte Chain in Confined Spaces of Nano/Microchannels: Simulation and ExperimentPolyelectrolyte Adsorption in Shear Flow with Hydrodynamic Interaction: Kinetic Theory and Brownian Dynamics SimulationsEffect of Viscoelasticity on Drop Deformation in 5:1:5 Contraction/Expansion Micro-Channel FlowFlow and Stability of Wormlike Micellar and Polymeric Solutions in Converging and T-Shaped MicrochannelsReversible and Irreversible Flow-induced Phase Transitions in Micellar SolutionsMorphology Development of Immiscible Polymer Blends in Extensional Flows Developed within a Microfluidic DeviceExtensional Effects in Viscoleastic Fluid Flow through a Micro-Scale Double Cross-SlotCoating of Model Rheological Fluids in MicrochannelsSpreading Dynamics of Non-Newtonian Inkjet Drop on Solid SurfaceAnomalous Reduction in Pressure Drops of the Water Flow through Micro-Orifices in High Velocity RangesImpact of Viscosity Ratio on the Dynamics of Droplet Breakup in a Microfluidic Flow Focusing DeviceFlow of Oil-Water Emulsion through Constricted Capillary TubesSteady State Droplet Deformation and Orientation during Bulk and Confined Shear Flow in Blends with One Viscoelastic Component: Experiments, Modeling and Simulations

POSTERSDiffusive and Convective Mass Transfer in Two-Phase Microchannel Flow: Non-Equilibrium Interfacial TensionElectrohydrodynamic Generation and Transport of a Single or Multiple Droplets of Aqueous Two-Phase System in Microfluidic DeviceA Novel Microfluidic Mixing Element for Viscoelastic Fluids

COLLOIDAL GELS AND GLASSESORAL PRESENTATIONSAge-Dependent Relaxation Times of Soft Colloidal Suspensions with Tunable GlassinesAging under Shear: Effect of Stress and Temperature FieldRheological Properties and Structure of Gels Generated from Stable Polymer Colloids through High Shear in a MicrochannelRheology of Frustrated Colloidal States: Transition from a Colloidal Gel to an Attractive GlassStructure and Rheology of Dense Micelles Suspensions Formed by Hydrophobically End-Capped PEONetwork Induced Relaxation Dynamics in Colloidal GelsAging and Yielding of Colloidal Suspension by MRI VelocimetryYielding and Aging in Sheared Lyotropic Phases of Interconnected BilayersGravitary Free Surface Flows Used as a Rheometrical Tool: The Case of Viscoplastic FluidsInfluence of the Shear Stress Applied during the Flow Stoppage and Rest on the Mechanical Properties of Thixotropic Suspensions

POSTERSAvalanches of Concentrated Granular Suspensions Down an Inclined Plane

INTERFACIAL RHEOLOGYFlow-Induced Assembly of Nickel NanoparticlesSelf-Assembly and Surface Rheology of 2D Suspension of EllipsoidsInterfacial Shear Rheology of Coffee SamplesAdvancing Contact Line Dynamics Induced by Soluble Surfactant Deposition on a Thin Liquid FilmComplex Rheology of Molecularly Thin Films and the Role of Surface and StructureLinear and Nonlinear Rheology of Two Dimensional Polymers: A Brownian Dynamics StudyDynamics of Adhesion between the Spherical PDMS Rubber and the Glass SubstrateDirect and Indirect Polymer-Polymer Interfacial Slip Measurements in Multilayered FilmsInterfacial Elasticity of Reactively Compatibilized PP/PA6 BlendsViscoelasticity of Semifluorinated Alkanes at the Air-Water InterfaceModeling and Characterization of Encapsulated Microbubbles for Ultrasound Imaging and Drug Delivery

MICRO-RHEOLOGYMultiple Particle Tracking (MPT) Measurements of Heterogeneities in Acrylic Thickener SolutionsMicrorheology of Responsive Hydrogel NetworksModeling Aspects of Two-Bead MicrorheologyMaterial Assembly and Gelation Kinetics of PEG-Heparin Hydrogels Using Multiple Particle Tracking MicrorheologyMicro-Rheology Using Multispeckle DWS with Video Camera: Application to Film Formation, Drying and Rheological Stability

NEW EXPERIMENTAL METHODSORAL PRESENTATIONSMeasuring the Elongational Properties of Polymer Melts: A Simple Task?Measurement of Reversed Extension Flow Using the Filament Stretch RheometerA New Dual Controlled Stress/Rate Extensional Rheometer for High Viscosity SystemsDetermination of Extensional Rheological Properties by Hyperbolic Contraction FlowThe Effect of Step-Stretch Parameters on Capillary Breakup Extensional Rheology (CaBER) MeasurementsBreak-Up in Capillary Thinning Experiments: Using the CaBER to Determine Maximum Tensile Strength at Low Stressing RatesMeasurement of Rheological Properties under High Shear Rate Induced by Collision of MicrodropletsPulse Jets, Rims, and Elastic-Liquid Sheets: Rheology at High Strain Rates and Rupture CriteriaEvaluation of Planar Elongation Viscosity by Drag Force Acting on a Bullet BobA Conveyor Belt Setup for Studying Gravitary Free-surface Flows of Complex FluidsAn Ontology for Large Amplitude Oscillatory Shear FlowNon-Linear Oscillation Testing with a Separate Motor Transducer RheometerOn the Use of Rheology for the Investigation of the Morphology of Blends of Natural Rubber (NR) and Polybutadiene (PB)Measurement of the Rheological Properties of Magnetorheological Fluids Using a Double Concentric Halbach Cylinder ArraySimultaneous Light Scattering-Rheology Measurements for Studying Stress Induced Phase TransitionsLinear to Branched Micelles Transition: A Rheometry and Diffusive Wave Spectroscopy (DWS) StudyNon-Contact Method for Measurement of Surface/Interfacial Liquid Properties with Laser Manipulation TechniqueDirect Observation of Phase Transition Dynamics in Suspensions of Soft Colloidal Hydrogel ParticlesVibrating Microcantilevers: Tools for MicrorheologyThe High Normal Force Partitioned Plate Rheometer MTR 25Determination of Normal Stress in Micrometer Thin FilmsA Flexible Platform for Tribological Measurements on a RheometerFrom Rheology to Tribology: Multiscale Dynamics of Biofluids, Food Emulsions and Soft MatterA Novel Method of Measuring the Phase Behavior and Rheology of Polyethylene Solutions Using a Multi-Pass RheometerLinear Viscoelasticity on Short Time Scales: Real-Frequency Mechanical Spectroscopy Up to kHz RangeThe Effects of Stressing Rate on Measurements of the Cavitation Threshold of Monograde Lubricants by Pulses of TensionA Continuous Lubricated Squeezing Flow Technique to Study the Rheological Behavior of Polymer Melts in Equibiaxial Elongational FlowNovel Instrument for Parallel Superposition MeasurementsCharacterisation of Large Deformation Behaviour of Starch Gels Using Compression and Indentation TechniquesCharacterization Theory and Technique for Polymer Melt Under the Superimposed Vibration

POSTERSFourier Transformation Analysis in Capillary Flow: A New Option to Detect Flow Instabilities (Shark Skin)From Sample Changer to the Robotic Rheometer: Automation and High Throughput Screening in Rotational RheometryUsing Rheo-Optical Methods to Analyse the Waxing of Crude OilInnovations in Rheometer Controlled-Rate Control Loop Design: Ultra Low Angular Speed Control and New ApplicationsExtending the Capabilities of the CaBER with Highly Sensitive Force MeasurementsIn-Situ Photorheology and Electron Spin Resonance to Assess Polymer PhotoagingUltrasound as a Complementary Tool to Internal Mixers for Investigation of Thermal Mechanical Degradation of PETA Real-Time Ultrasonic Technique for Viscosity Monitorintg during Polymer Processing

FOOD RHEOLOGYORAL PRESENTATIONSTowards a Simple Constitutive Model for Bread DoughRheology of Model Dough FormulationSignificance of Wheat Flour Dough Rheology to Gas Cell Structure Development in Bread and Other Baked ProductsCharacterisation of Fracture Behaviour of Starch Gels Using Conventional Fracture Mechanics and Wire Cutting TestsFirst Steps in Understanding Texture Perception in the Human Mouth as an Inverse Bio-Fluid Mechanical ProblemEffects of Sugar Content and Temperature on Rheology and Microrheology of Israeli HoneyRheology of Coating Materials and Their Coating CharacteristicsUltrasound Based In-Line Rheometry of Complex FluidsDeformation and Break-Up of Suspension Droplets Sheared in an Immiscible FluidNovel Rheology in a Structured Food Product—MarmiteTMRheological Characterization of Vegetal Pear (Sechium Edule)

POSTERSRheological Behavior, Granule Size Distribution, and Differential Scanning Calorimetry of Cross-Linked Banana (Musa paradisiaca) StarchRheological Study of Batter Dough for Yorkshire Pudding ProductionOlive Oil Based Emulsions in Frozen Puff Pastry ProductionInfluence of Fat Content on Chocolate RheologyMechanical Modeling of Foods Including Fracture and Simulation of Food CompressionRheology of Film-Forming Solutions Prepared with Modified Banana Starch and PlasticizerEffect of Frozen Storage on the Gel-Forming Ability of Surimi Treated by Acid and Alkaline SolubilizationRheological Modification of Reduced Fat Chocolate Induced by the Addition of LimoneneUtility of Squeeze Flow in Food Industry

RHEOLOGY OF SOLIDS AND GLASSESORAL PRESENTATIONSMultivariate Feature of Dielectric Relaxation Processes in Liquid Sugar Alcohol System with the Glass TransitionScaling of the Structural Relaxation in Supercooled Fragile Liquids and Simulated Liquid SilicaEmpirical Description of the Frequency Response of Glass Transition Related Relaxation ProcessesEffect of Crosslinking on Segmental and Secondary Dynamics of PolyvinylethyleneHeat Capacity and Entropy at the Glass TransitionMolecular Dynamics of Ultra-thin Supported Polysulfone FilmsEffects of Severe Confinement on the Structure and Dynamics in Polymer NanocompositesInfluence of Confinement and Substrate Interaction on the Crystallization Kinetics of PET Ultrathin FilmsAging Phenomena in Thin Polymer Films Observed Through Volume and Dielectric SusceptibilityAging in PMMA/Toluene FilmsEffect of Silica Nanoparticles on the Local Segmental Dynamics in PolyvinylacetateCrystals in Polymers May Afford Better Mechanical Performance than Solid MesophasesLinking Slow Dynamics and Local Structure in Simple Models of Glass-Forming LiquidsTemperature Dependence of Relaxation Time in Adam-Gibbs Model of Glass-Forming Liquids: Fluctuation EffectsSolid-State Constitutive Modelling of Glassy Polymers: Coupling the Rolie-Poly Equations for Melts with Anisotropic Viscoplastic FlowDirect Atomistic Modelling of Deformed Polymer GlassesFinite Strain Viscoplastic Modelling of Polymer GlassesQuantitative Prediction of Mechanical Performance of Polymer Products Directly from Processing ConditionsThe Strain Accumulation Process in Periodically Loaded Polymer Based Products due to Viscoelastic Behavior of PolymersEffects of Strain on the Long Term Rheology of Filled Viscoelastic SolidsMolecular Mobility of Soft Segment of Polyurethane Elastomers under Elongation

POSTERSThe Effect of Water on the Modification of Bitumen with MDI-PEG PrepolymerRheological Properties of Gels from Pyrene Based Low Molecular Weight GelatorsExperimental and Numerical Studies on Mudstone/s Creep Behavior during Water Injection and Its Effect on Casing DamageExtended Creep Recovery via Oscillatory Shear and Bending Beam RheometersKinetic Toy Model for Crystal PlasticityThe Research on Rheology Mechanism of Coal-rock Containing Gas

GENERAL RHELOGYORAL PRESENTATIONSOn the Use of Laplace Transform Inversion for Reconstruction of Relaxation SpectraConstitutive Equation for Polymer Networks with Phonon FluctuationsA New Approach to Determine the Nonlinear Parameter of the Giesekus Constitutive ModelEnergy Elastic Effects in Flowing Polymeric Liquids, and the Concept of Nonequilibrium TemperatureWall Slip during the Flow of Carbopol Solutions through a Parallel Plate ChannelLiquid-Liquid Displacement Flows in an Annular Space Including Viscoplastic EffectsBrownian Dynamics of Polymers at High Strain RatesSharing the World/s Advanced Rheology Knowledge through Rheo-HubVirtual Psychorheometry: Concept and ApplicationDevelopment of Branched Polycarbonate by an Ultrasound-Assisted Melt Mixing Process with Multifunctional AgentsCouette Rheometry from Differential Approach: Comparative Study and Experimental ApplicationEstimation of the Molecular Weight between Crosslinks of Crosslinked Semicrystalline PolyolefinsRheology of Carbon Fibre Reinforced Cement-Based MortarTransient Droplet Behavior and Droplet Breakup during Bulk and Confined Shear Flow in Blends with One Viscoelastic Component: Experiments, Modeling and SimulationsEffects of Particle Hardness on Shear Thickening Colloidal Suspension RheologyShear and Extensional Rheometry of PDMS Tamponade Agents Used In Vitroretinal SurgeryFlow Instability of Colloidal Dispersions Flowing through a Very Small Orifice

POSTERSExperimental Research on Pyromagnetic Effect of PVC SheetSlump Flows Inside Pipes: Numerical Results and Comparison with ExperimentsIn-Situ Rheo-SAXS Study on Shear Induced Alignment of Liquid Crystal (8CB) in the Smectic Phase under LAOSBack-Flow of Nematic Liquid Crystals and Its Application to Liquid Crystalline MicroactuatorsExperimental Results on Electrorheology of Liquid Crystalline Polymer SolutionsReverse Poiseuille Flow: The Numerical ViscometerFluid-Solid Transition Approach Using Continuum Damage MechanicsCorrelation between Organic Matter Degradation and the Rheological Performance of Waste Sludge during Anaerobic DigestionThe Generalized Power-Law: A New Viscosity ModelNumerical Simulation of Heat Transfer Enhancement in Laminar Flow of Viscoelastic Fluids through a Rectangular ChannelAbnormal Viscosity Behaviour of Ionic Liquid 1-n-Butyl-3-Methylimidazolium ChlorideRheological Properties of Vegetable Oil-Diesel Fuel BlendsDevelopment of EHD Motor of Water Solution Utilizing ElectrohydrodynamicsMotion Control of Disc Electrode by Electrorheological FluidsTransient Shear Flow of Model Lithium Lubricating GreasesGeometric Interpretation of Linear Viscoelasticity and Time-Temperature SuperpositionDetermination of Discrete Relaxation Time Spectrum by Use of Continuous Wavelet TransformNumerical Simulation in Steady Flow of Newtonian and Shear Thickening Fluids in Pipes with Circular Cross-SectionEmptying Time of a Tank Filled up with Explosive Paste: Comparison between Experimental Measurements and Predictions Based on Rheological Characterization of the Paste

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