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。 In order to meet the demand of high power laser, a large channel radiator with large aspect ratio is designed, and its heat transfer performance is experimentally studied by using deionized water as working medium. The results show that when the cooling surface temperature is 70 ℃ and the flow rate is 58.2 L / h, the cooling capacity of the 3 mm high channel radiator reaches 3 × 106 W / m2. When the flow rate is constant, the surface temperature of the radiator with different height And the heat output is linear, but the channel height has the best value. The Nusselt number (Re), Reynolds number (Re), channel aspect ratio, channel aspect ratio And Prandtl (Pr) empirical relationship, which can better reflect the radiator cooling characteristics; channel heat sink average thermal resistance decreases with the flow rate increases, but also with the channel height; channel radiator exists Good flow and the best height.