cae lab report ii
TRANSCRIPT
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CAE LAB REPORT II
MOHAMMAD SALIMUDDIN
ME08B016
31/08/2010
AIM: To determine the temperature distribution plot and heat transfer rate, using FLUENT for a
given geometry with two different cases: a). Short fin b). Long fin
Case I - Short Fin:
y The meshed 2D geometry is imported into FLUENT and input conditions are fed, whichare:
Mesh: L=200 mm , b= 50 mm
Fin
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1. Models:Model Settings
-------------------------------------
Space 2DTime Steady
Viscous Laminar
Heat Transfer Enabled
2. Material Properties:Material: air (fluid)
Property Units Method Value(s)
------------------------------------------------------------------------------------
Density kg/m3 boussinesq 1
Cp (Specific Heat) j/kg-k constant 1006.43Thermal Conductivity w/m-k constant 0.0242
Viscosity kg/m-s constant 9.9999997e-06
Molecular Weight kg/kgmol constant 28.966
Thermal Exp. Coeff. 1/k constant 0.0024999999
Material: aluminum (solid)
Property Units Method Value(s)
--------------------------------------------------------------------------------------
Density kg/m3 constant 2719
Cp (Specific Heat) j/kg-k constant 871
Thermal Conductivity w/m-k constant 202.4
Cell zone Settings: Operating temperature is 300K and this is the fluid ambient temp.
Boundary Conditions Settings: Fin base temp. is 500K, rest of the settings are kept at default
Solution Settings:
Solution method PISO/SIMPLEC Solution Controls: Under relaxation factors are assigned for pressure, density, body
forces, momentum and energy. It should be some value less than or equal to unity.
Initialized Solution Run the calculation
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y Contours and Plots:1. Pressure:
2. Temperature:
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3. Velocity Contours:i). X-component:
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ii). Y-component:
iii). Velocity Vector:
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4. Temperature distribution plot:
y Results: Surface area (new wall) : 0.021000002 m2 Heat Flow rate: 32.993713 W Fin Temperature (Volume Average) : 499.3858 K
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Case II Long fin:
y The meshed 2D geometry is imported into FLUENT and input conditions are fed, whichare:
Mesh:
Models:Model Settings
-------------------------------------
Space 2D
Time Steady
Viscous Laminar
Heat Transfer Enabled
Material Properties: Same as that for short fin case Cell zone settings: Same as that for short fin case Boundary conditions settings : Same as that for short fin case Solution settings:
Again, idea is to play with the under-relaxation factors and take what is suitable Finally, run the solution
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3. Contours and Plots:1. Pressure:
2. Temperature:
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3. Velocity Contours:i). X-Component:
ii). Y-Component:
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iii). Velocity vector:
4. Temperature distribution plot:
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y Results: Surface area (new wall) : 0.021000002 m2 Heat Flow rate: 148.5107 W Fin Temperature (Volume Average) : 475.18008 K
y Iteration1: Keeping all other input conditions same except Viscous option changed from
Laminar to Standard k-epsilon turbulence model , when the long fin problem
was solved, I got the following results:
Heat Flow rate: 1150.1173 W Fin Temperature (Volume Average) : 363.98773 K Temp. Distribution Plot :