Thermal-hydraulic performance analysis of a liquid-jet-cooled heat sink with a macroscopic porous flow diverter

Abstract

In this work, a liquid-jet-cooled heat sink having a microporous flow diverter plate is proposed for the reduction of the maximum operating chip temperature, while simultaneously achieving uniform cooling rates. Different diverter opening ratios (ratio of the macroporous openings to the total diverter plate area) were considered, and the results indicate that the smaller opening ratios create a visible tradeoff between hydraulic and thermal performance. The contrast between thermal and hydraulic performance was assessed using the PPTR overall performance parameter. The heat sinks with smaller opening ratio diverters had better thermal performance and achieved more uniform temperatures than heat sinks with larger opening ratios. The results show that small opening ratio diverters produce higher flow velocities through the nozzles, thus increasing the pressure loss of the heat sinks. The results indicate that heat sinks with small opening ratios yield the lowest thermal resistance at the same pumping power input. In order to eliminate the recirculation zone of the flow chamber, three parametric structures were proposed. The parameterization of the flow chamber eliminated the recirculation regions, but pressure drop reductions of approximately 2.4% to 3.4% were obtained. It was concluded that the recirculation zone of the flow chamber had little effect on pressure drop, while more attention should be put into the openings of the diverter plate.