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