不同通道尺寸的微通道相变散热器性能研究

Research on the performance of micro-channel phase change heat sinks with different channel sizes

为了解决高集成度高热流密度电子器件的散热需求,文中对微通道相变散热器进行研究,设计了5种不同尺寸的微通道来研究其对传热系数和压降特性的影响。通过搭建微通道相变散热验证系统对微通道相变散热器进行实验,以水为工作物质,流速为50~170 mL/min,热源热流密度为86~414 kW/m^(2)。研究结果表明,传热系数与水力直径成反比关系,当水力直径为0.333 mm、工质流速为170 mL/min时,传热系数值最大为116 kW/(m^(2)·℃);当工质流速不变时,压降随热流密度的增大先减小后增大;当工质流速和热流密度不变时,压降随水力直径的增大而减小,并且随着流速的增大,压降的变化趋势逐渐趋于平缓。

In order to meet the heat dissipation requirements of highly integrated and high heat flux electronic devices,the microchannel phase change heat sink is studied. Five microchannels of different sizes are designed to study their effects on the heat transfer coefficient and pressure drop characteristics.The microchannel phase change heat dissipation verification system was built to conduct experiments on the microchannel phase change heat sink. The water was used as the working substance,the flow rate was50~170 mL/min,and the heat flux density of the heat source was 86~414 kW/m^(2). The research results show that the heat transfer coefficient has an inverse relationship with the hydraulic diameter. When the hydraulic diameter is 0.333 mm and the working fluid flow rate is 170 mL/min,the maximum heat transfer coefficient value is 116 kW/(m^(2)·℃);when the working substance flow rate remains unchanged when the pressure drop first decreases and then increases with the increase of heat flux density;when the working fluid velocity and heat flux density remain unchanged,the pressure drop decreases with the increase of hydraulic diameter,and as the flow velocity increases,the pressure drop the trend of changes gradually flattened out.