喷雾高度和流量对不同表面结构传热系数影响的实验研究

Experimental Study on the Influence of Spray Height and Flow Rate on Heat Transfer Coefficients of Different Surface Structures

设计搭建了喷雾冷却实验台,以去离子水为冷却工质,研究了喷雾高度和流量对光滑表面和方肋表面传热系数的影响。喷雾高度从29 mm降低到10 mm,喷雾流量的变化范围为20~32 L/h。实验结果表明:喷雾高度从29 mm降低到14 mm,表面传热系数增加72%,而从14 mm降低到10 mm,表面传热系数仅增加2.7%;喷雾流量从20 L/h增加到32 L/h,表面温度降低2.4℃,表面传热系数增加10.6%;在相同的实验工况下,方肋表面的传热系数始终大于光滑表面。

A spray cooling experimental platform was designed and built,and the influence of spray height and spray flow on the heat transfer coefficients of smooth surface and square rib surface was studied with deionized water as the cooling medium.The spray height decreased from 29 mm to 10 mm,and the variation range of spray flow was between 20 L/h and 32 L/h.The experimental results show that the spray height decreases from 29 mm to 14 mm,and the surface heat transfer coefficient is increased by 72%.While the spray height decreases from 14 mm to 10 mm,the surface heat transfer coefficient is increased by just 2.7%.When the spray flow rate increases from 20 L/h to 32 L/h,the surface temperature is decreased by 2.4℃,and the surface heat transfer coefficient is increased by 10.6%.Under the same experimental conditions,the heat transfer coefficient of the square rib surface is always greater than that of the smooth surface.