Cae Lab Report II

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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 :

Cae Lab Report II

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