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.