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Numerical Analysis of Thermal Convection in a CPU Chassis

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Document pages: 16 pages

Abstract: Flow distribution and theeffects of different boundary conditions are achieved for a steady-stateconjugate (Conduction & Convection) heat transfer process. A plate fin heat sink with horizontal finorientation along with a computer chassis is numerically investigated andsimulated using software ANSYS CFX. Fin orientation of a heat sink changes thedirection of fluid flow inside the chassis. For predicting turbulence of theflow inside the domain, a two-equation based k-ε turbulence model is chosen.The Reynolds number basedon inflow velocity and geometry is found 4.2 × 103 that indicates that theflow is turbulent inside the chassis. To get proper thermal cooling, theoptimum velocity ratio of inlet outlet, dimensionof inlet outlet and different positionsof outlet on the back sidewall of thechassis are predicted. Aspect velocity ratio between the inlet airflowand the outlet airflow has an effect onthe steadiness of the flow. Mass flowrate depends on the dimension ofthe inlet outlet. The horizontal fin orientation with 1:1.6 inlet-outlet airflow velocity ratio gives better thermalperformance when outlet is located at thetop corner of the chassis, near to theinner sidewall. Flow distribution and heat transfer characteristics are alsoanalyzed to obtain the final model.

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