Research On Flow And Heat Transfer Characteristic In Rectangular Micro-channel Heat Sinks Based On Different Inlet Angles

A three-dimensional model with constant flux condition has been developed to simulate the laminar convective heat transfer in rectangular micro-channel heat sinks based on N-S equation using the FLUENT software. Firstly, the geometric dimensions effect on micro-channel heat sinks performance were studied numerically in order to choice the applicable dimensions of heat sinks. Then, flow and heat transfer characteristic in rectangular micro-channel heat sinks with different inlet angles were simulated numerically, At last, the experimental research on energy balance and flow pressure of the heat sinks were validated compared with the numerical predictions, and the conclusions were as follows:(1) with the increase of the length of manifold, the flow uniformity become better, the pumping power lower, but the maximum temperature of heat sinks rise and temperature uniformity of substrate become worse, the change in total thermal resistance is small.(2) with the increase of the length of micro-channel, the change in flow uniformity is small,the pumping power higher, but the maximum temperature of heat sinks can be approximated as constant and temperature uniformity of substrate become worse, total thermal resistance decreased.(3) Relatively, there exist a well outlet angle that makes the heat sinks obtain a better velocity and temperature fields and improve convective heat transfer coefficient and total thermal resistance and enhance the performance.(4) The experimental results show that with the increase of volume flow, the temperature difference between inlet and outlet decreased, the pressure drop increased.