Abstract
In this paper, we present some findings from an experimental and numerical study aimed to obtain physical insight into the influence of the presence of the shield and its position on the hydraulic and thermal performance of square pin fin heat sink without top by-pass. The variation of the Nusselt number and friction factor is obtained under varied parameters such as Reynolds number and shield position. The numerical code is validated by comparing the numerical results with the available experimental data. It is shown that, there is a good agreement between the temperature predictions based on the model and the experimental data. Results show that, as the presence of the shield, the heat transfer of fin array is enhanced and the flow resistance increased. The surface temperature distribution of the heat sink base is more uniform when the dimensionless shield position equals to 1/3 or 2/3. The comprehensive performance evaluation approach based on identical pumping power criteria is adopted and shows that the optimum shield position is at x/L=0.43 where the smallest energy consumption is.
Highlights
The constant demand for speed and performance in electronics is accompanied by ever increasing thermal dissipation
After validation of the CFD code, either experimental or numerical data can be used to investigate the effect of Reynolds number and dimensionless shield position on the hydraulic and thermal performance of pin fin heat sink
The heat transfer performance of fin array is enhanced as the influence of the shield
Summary
The constant demand for speed and performance in electronics is accompanied by ever increasing thermal dissipation. Shaukatullah et al [5] measured the thermal performance for in-line square pin fins and plate heat sinks for different fin thickness, spacing, height, and angle of approach for velocities under 5 m/s, while allowing flow to partially by-pass the exchanger. Tsai et al [13] investigated the effect of the inclination angle of a plate heat shield on thermal and hydraulic performance of a plate fin heat sink It found that the minimum pressure drops for smaller fin heights appear for inclination angles of shield about 90° to 105°. The focus of the present work is to experimentally and numerically investigate the effect of a shield position on the hydraulic and thermal performance of pin fin heat sink.
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