Flow distribution and the
effects of different boundary conditions are achieved for a steady-state
conjugate (Conduction & Convection) heat transfer process. A plate fin heat sink with horizontal fin
orientation along with a computer chassis is numerically investigated and
simulated using software ANSYS CFX. Fin orientation of a heat sink changes the
direction of fluid flow inside the chassis. For predicting turbulence of the
flow inside the domain, a two-equation basedk-ε turbulence model is chosen.
TheReynolds number based
on inflow velocity and geometry is found 4.2×103 that indicates that the
flow is turbulent inside the chassis. To get proper thermal cooling, the
optimum velocity ratio of inlet/outlet, dimension
of inlet/outlet and different positions
of outlet on the back sidewall of the
chassis are predicted.Aspect velocity ratio between the inlet airflow
and the outlet airflow has an effect on
the steadiness of the flow. Mass flow
rate dependson the dimension of
the inlet/outlet. The horizontal fin orientation with 1:1.6 inlet-outlet airflow velocity ratio gives better thermal
performance when outlet is located at the
top corner of the chassis, near to the
inner sidewall. Flow distribution and heat transfer characteristics are also
analyzed to obtain the final model.
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