Thermal Analysis of the Novel Throat-Type Micro-Channel Heat Sink: Achieving Minimal Power Consumption and Maximal Thermal Performance

Abstract

This study numerically investigates, for the first time, the enhanced heat transfer performance of throttled microchannel structures with heat sinks (TMCSH) under energy-saving and consumption-reduction conditions. By comparing with conventional straight-channel heat sink structures, the effects of various factors-such as throat opening size, throat length, and the number of throat elements arranged within the microchannel-on enhanced heat transfer capability, thermal control efficiency, overall heat exchange performance, and energy-saving efficiency are systematically analyzed. Moreover, the influence of different operating conditions, such as Reynolds number and heat flux, on the heat transfer characteristics of TMCSH is thoroughly explored. The results show that, compared to traditional straight-channel structures, the incorporation of throat elements can effectively improve the system's heat transfer performance. The optimal throat configuration-termed the converging acceleration microchannel (CAM)-reduces the maximum temperature by approximately 27 K and lowers energy consumption by around 36.4%. The degree of throat opening and throat length significantly affect the thermal management performance of TMCSH, with optimal structural dimensions (Lc/Dh=0.30 and Lt/Lx2=0.1) enabling highly efficient comprehensive heat exchange while reducing energy consumption by more than 30%. Furthermore, increasing the number of throat elements can further enhance the thermal control performance of TMCSH, with a maximum energy-saving efficiency of approximately 80%.

Keywords: microchannel, Thermal control management, Energy Saving, Numerical simulation.