基于沸腾-空化耦合效应的微通道线阵LD用热沉

Micro-channel heat sink based on boiling-cavitation coupling effect for LD bar

针对大功率LD的冷却需求,基于沸腾-空化耦合效应,研制了一种微通道相变热沉,封装腔长1.5 mm的LD线阵。依据加工条件确定通道宽度、深度以及间距,采用2维数值模型估算了通道长度,热沉材料采用无氧铜,多层叠焊,外形尺寸为20 mm×12 mm×1.6 mm。实验测试了连续功率LD输出0~100 W时的电-光转换效率以及电流-输出功率等特性,冷却工质采用R134a,磁驱齿轮泵电机转速50 r/s时热沉热阻为0.3℃/W。结果显示微通道相变热沉具有良好的散热能力,能够满足大功率LD的散热要求。

A copper micro-channel phase-change heat sink has been developed for cooling high power continual laser diode based on coupling of boiling-cavitation in micro-channel.Its exterior size was 20 mm×12 mm×1.6 mm.The length of channel was estimated through 2D numerical calculation,and the width,depth and separation were determined according to processing conditions.The electron-optic efficiency,output wavelength and the relation between input current and output power were measured experimentally when LD output power changes from 0 to 100 W.The cooling refrigerant was R134a.The thermal resistance of heat sink was measured as 0.3 ℃/W,when the magnetic drive gear pump operated at 50 r/s motor speed.