微通道-微槽群中间换热器特性实验研究

对用于固体激光介质冷却的组合式中间换热器的流动与传热特性进行了实验研究。实验研究结果表明：努塞尔数随雷诺数的增加而增加，总热阻随微通道侧蒸馏水流量的增加而减小，总换热量随微通道侧蒸馏水流量的增加而增加，且换热器的传热系数可以达到1.5×104 W/(m2·K)，总热阻小于0.3 K/W，能较好地解决当前固体激光介质冷却系统中间换热器所存在的问题。

Experimental study on characteristics of an microchannels-microgrooves middle heat exchanger

A middle heat exchanger with microchannels- microgrooves(MC- MG) is used to cool solid- state laser medium. Flow and heat transfer characteristics of MC- MG heat exchanger have been studied experimentally. The experimental results indicate that the Nusselt number increases as the Reynolds number increases, and the general thermal resistance decreases as the distilled water flow in microchannels increases. The total heat transfer quantity increases with the increase of distilled water flux in microchannels. The average heat transfer coefficient of the MC- MG heat exchanger can reach 1.5×104 W/ (m2·K) and its general thermal resistance is smaller than 0.3 K/W. The solution of cooling high power laser with MC- MG heat exchanger is preferable.