毛细矩形微槽群表面喷雾冷却实验研究  

EXPERIMENTAL INVESTIGATION ON SPRING COOLING IN RECTANGULAR CAPILLARY MICRO-GROOVES

作　　者：谢宁宁[1,2] 胡学功[1] 唐大伟[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院研究生院,北京100190

出　　处：《工程热物理学报》2010年第5期805-809,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目资助(No.50776088)

摘　　要：本文是在开放式喷雾条件下,以一次蒸馏水为工质,通过改变毛细矩形微槽群表面的位置、喷嘴的出口压力P以及流量G对毛细矩形微槽群表面的换热特性进行实验研究。微槽表面的槽深、槽宽和槽间距分别为0.7 mm、0.55 mm及0.15 mm,微槽的有效加热表面为2 cm×2 cm,喷嘴出口压力P的变化范围为0.3～1.0 MPa。实验研究表明,加热表面的位置对换热效果有一定的影响,在毛细矩形微槽群表面微槽的法线方向与地面平行且轴向方向也与地面平行时的换热效果最好;同时,喷嘴的压力及流量的变化对喷雾冷却也有很大的影响,在单相换热区域,压力流量越大换热效果越好,但在两相换热区域,随着压力流量的增加换热效果则是先增加后减小,本实验在压力为0.51 MPa,流量为26.5 mL/min时所得的换热效果最好。Spray cooling experiments have been performed on rectangular capillary micro-grooves in an open chamber at the atmospheric pressure.Distilled water was used as working liquid in this experiment.The effects of entrance pressure of nozzle P,volumetric flux G and placement angle of the microgrooves on the heat transfer were investigated.Experimental testing took place in the 2 cm×2 cm effective heated area on the surface of rectangular microgrooves,with the groove width 0.55 mm, the depth 0.7 mm,the pitch 0.15 mm,and the range of entrance pressure of nozzle P 0.3～1.0 MPa. The experimental results show that the placement angle of the microgrooves,the entrance pressure of nozzle P and the working flux G have considerable effects on heat transfer,and the maximum heat flux in this experiment can be obtained when both the axial and the normal direction of the grooves are parallel to the ground.The results also indicate that the heat transfer rises as the pressure P increases in the single-phase regime,but in the two-phase regime,the heat transfer rises at first and then declines,and the maximum heat flux can be obtained when pressure P is 0.51 MPa and working flux 26.5 mL/min.

关 键 词：喷雾冷却 矩形毛细微槽群表面 喷嘴出口压力 

分 类 号：TK124[动力工程及工程热物理—工程热物理]