Numerical and Experimental Study of Isotherm Field Inside a Desktop P.C.

Abstract

In this paper the heat transfer analysis from a heat generation components (centralprocessing unit CPU and power supply) in a P.C. desktop was studied. Experimentaland three – dimensional numerical study of laminar steady flow with mixedconvection has been analyzed(for Ra=8.3*10 5 ). The Computational Fluid Dynamics(CFD) techniques are employed in numerical solution to calculate the temperaturedistribution inside the computer, by solving continuity, momentum and energyequations. This technique is based on structured grid (staggered grid) and finitevolume formulation to discretize the governing equations (reduced to algebraicequations). The hybrid scheme and SIMPLE algorithm have been carried out to getthe final solution. Five cases are studies for different heat source and inlet air flowlocations. The temperature distribution and average temperature inside the computerare calculated to reach the optimum thermal design of the five cases. The numericalresults obtained are found in a satisfactory agreement with the experimental results.Further the results confirmed that the most important parameter affecting the thermalbehaviors is the position of heat-generation source and inlet air flow. The numericalsolution shows that the case (4) is the optimum thermal design by comparison withother cases.