摘要
采用雾化角60°的半实心旋流式机械雾化喷嘴,以水为冷却介质,对流量4.44～7.05 L·h-1,倾斜角在0°～49°之间变化时无沸腾区换热进行实验研究,并且给出了反映喷雾换热特性的量纲1换热准则公式。结果表明,倾斜角固定不变时,当喷射底面椭圆长轴与换热面相切时所对应的喷嘴高度为最佳高度,换热效果最好,冷却效率最高,其次分别是喷射底面椭圆长轴和换热面内接、外接的情况;对比不同倾斜角度、最佳高度下的换热,发现倾斜角度越大换热效果越佳,冷却效率越好。
Experiments were conducted to study the effect of inclination angle （the angle between the normal of surface and the axis of symmetry of the spray） on heat transfer of spray cooling in the nonboiling regime by using water as coolant. A generalized correlation was developed for local and average Nusseh numbers as a function of the spray Reynolds number and non-dimensional temperature when the mass flow rate ranged from 4. 44--7.05 L · h^-1. The spray was produced by using a semi-solid swirl nozzle under the atomization pressure of 0.5 MPa. The results showed that at a fixed inclination angle, the optimum orifice-to-surface distance where the heat transfer performance was the best was determined when the major axis of the elliptical spray impact area intersected the square test surface. Comparing different inclination angles from 0° to 49° at the optimum orifice-to-surface distance, the heat transfer performance and cooling efficiency increased with increasing inclination angle.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2009年第8期1912-1919,共8页
CIESC Journal
关键词
喷雾冷却
倾斜角
换热效果
冷却效率
spray cooling
inclination angle
cooling performance
cooling efficiency
