multiscale analysis of gas absorption in liquids wylock, dehaeck, mikaelian, larcy, talbot, colinet,...
TRANSCRIPT
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Multiscale analysis of gas absorption in liquids
Wylock, Dehaeck, Mikaelian, Larcy, Talbot, Colinet, HautTransfers, Interfaces and Processes (TIPs)
Université Libre de Bruxelles
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TIPs department
Main objective of the research :
• Development of methods for the analysis of multiphase
systems, with the focus on transport phenomena
Scientific topics :
• Gas absorption in liquids, drying, evaporation, small scale
fluid physics (thin liquid film, contact line dynamics, …)
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Outline of this presentationPresentation of 3 new theoretical, numerical and experimental
methods for the characterization of gas absorption in liquids
Characterization of the CO2 absorption in aqueous aminesolutions, in the frame of the development of capture processes
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Our experimental tool : interferometry
CO2CO2
CO2
CO2CO2
HEP aqueoussolution
CO2
CO2
CO2CO2
CO2
Absorption of CO2 in HEP aqueous solution in a Hele-Shaw cell
CO2
Hele Shaw cell
Various HEP initial concentration
and Various inital amount of
CO2 absorbed
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5
Gas
Liquid
Interface
LaserLaser
Polarizer
Polarizer
Spatial filter
Spatial filter
LensLens
Beam splitter
Beam splitter
Beam splitter
Beam splitter
Miror 2
Miror 2
Miror 1Miror 1
CameraCamera
Hele Shaw cell
Hele Shaw cell
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6
LaserLaser CameraCamera
6
CO2
Time evolution of the refractive index
variation field in the Hele-Shaw cell
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Contours of the refractive index variation field in the cell (n x 104)
CO2
HEP Solution
CO2
CO2
CO2
CO2
CO2
CO2
CO2
CO2
CO2
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Refractive index variations can be related to loading variations
Loading (): (local) total amount of carbon moles (whathever the molecule it belongs
to) per unit volume of the solution
0
is identified by refractometry
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Proposed model for the time evolution of the loading variation
field in the Hele Shaw cell
CO2 transfer rate between the gas and the liquid
max: max loading variation at the interfacek : interface saturation kinetic constant
D : pseudo diffusion coefficient describing the ability of the amine to move towards the interface
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Model parameters identification by comparison with experiments
[HEP]0 = 1000 mol/m3
No initial loading
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Outline of this presentationPresentation of 4 new theoretical, numerical and experimental
methods for the characterization of gas absorption in liquids
Characterization of the CO2 absorption in aqueous aminesolutions, in the frame of the development of capture processes
Development of a new experimental set up for the analysis ofthe dynamics and the morphology of bubbles rising in liquids
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The experimental set up
de=2.5mm80 % water
– 20 % glycerol
No perspective effect !
Data obtained :
Precise mesure of the bubble volume
Field of view : 14 cm150 Hz
1024-1024 pixels2
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Ellipsoidal bubbles with helical motion : frequency of the motion
f
A period of the helical motion is achieved when the bubble rise a
distance of approximately 10 times its diameter
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Outline of this presentationPresentation of 4 new theoretical, numerical and experimental
methods for the characterization of gas absorption in liquids
Characterization of the CO2 absorption in aqueous aminesolutions, in the frame of the development of capture processes
Development of a new experimental set up for the analysis ofthe dynamics and the morphology of bubbles rising in liquids
Characterization of gas absorption into a spherical liquid droplet, in the frame of the development of flue gas cleaning processes
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Transfer of a component A from a gas phase to a liquid droplet in free fall in this gas
Finite element resolution of dimensionless transport equations with COMSOL Multiphysics 3.4, in a reference frame attached
to the mass center of the droplet (Re < 250, low solubility)
Post processing :
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Results
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Results : low Re
Pure diffusion in a sphere :
Re = 0,1
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Results : high Re
Re = 200
• Instantaneous saturation of a toroidal vortex periphery
• Diffusion inside this vortex
0.97 2.4
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Conclusion
Presentation of 3 new methods for the characterization of gas absorption in liquids, at different scale
Focus given on the understanding of transport phenomena and their coupling
Based on analytical, numerical and experimental approaches
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Many thanks for your attention!