大高宽比小槽道冷却大功率激光器的实验研究  

Experimental Studies on Large Height/Width Ratio and Mini-Channel Radiator for High Power Density Laser Cooling

作　　者：刘东[1] 刘明侯[1] 王亚青[1] 徐侃[1] 

机构地区：[1]中国科学技术大学热科学和能源工程系,安徽合肥230027

出　　处：《中国激光》2010年第3期640-645,共6页Chinese Journal of Lasers

摘　　要：针对大功率激光器散热需求,设计了大高宽比小槽道散热器,并用去离子水为工作介质对其换热性能进行实验研究。结果表明,当散热面温度为70℃,流量为58.2 L/h时,3 mm高槽道散热器散热能力达3×106W/m2;当流量一定时,不同高度的槽道散热器的表面温度和散热量成线性关系,但槽道高度存在最佳值;研究给出了槽道换热的努塞尔数(Nu)与雷诺数(Re)、槽道高宽比、槽道长径比和普朗特数(Pr)经验关系式,能较好反映该类散热器散热特性;槽道散热器的平均热阻随流速增加而降低,还与槽道高度有关;槽道散热器存在最佳流速和最佳高度。The radiators with different large height/width ratio mini-channels are designed for cooling high power density laser.Using deionized water as working fluid,it is found that the radiator with 3 mm height mini-channels can achieve heat dissipation of 3×106 W/m2 when surface temperature is 70 ℃ and flow rate is 58.2 L/h.The detailed experimental results show that the heat dissipating capacity is linearly with surface temperature for all mini-channel radiators when coolant flow rate is fixed.A suitable mini-channel height is required for maximum heat dissipation for this kind of radiator.A general empirical formula is proposed to evaluate cooling performance of the radiators with consideration of Nussel number（Nu） as a faction of Reynolds number（Re）,height/width ratio,length/diameter ratio,and Prandtl number（Pr）.Compared with the experimental data,it is found that the formula can describe heat dissipation performance of mini-channels radiator well.The average heat resistance of the radiator decreases with increasing of flow rate in mini-channels,while the trend is affected by the channel height.For maximum heat removal purpose,the mini-channels radiators have optimum working flow rate and channel height.

关 键 词：激光器 冷却 小槽道 大高宽比 

分 类 号：TK124[动力工程及工程热物理—工程热物理]