The effects of the surface roughness on the dynamic behavior of the successive micrometric droplets impacting onto inclined hot surfaces
The effects of the surface roughness on the dynamic behavior of the successive micrometric droplets impacting onto inclined hot surfaces
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DOI：
10.1016/j.ijheatmasstransfer.2016.05.132
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发表时间：
2016-10
影响因子：
5.2
通讯作者：
Deendarlianto;Y. Takata;M. Kohno;S. Hidaka;Takaaki Wakui;A. I. Majid;H. Kuntoro;Indarto;A. Widyaparaga
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文献类型：
--
作者：
Deendarlianto;Y. Takata;M. Kohno;S. Hidaka;Takaaki Wakui;A. I. Majid;H. Kuntoro;Indarto;A. Widyaparaga
实验研究了表面粗糙度对多个连续微小水滴撞击倾斜加热固体表面的动力学行为和传热现象的影响。倾斜角度分别为15°、30°和45°。液滴直径为500 μm和700 μm。固体表面温度从500 °C降低到100 °C。试验材料为不锈钢级304（SUS 304），具有不同的表面粗糙度，范围从Ra0.04到Ra10。利用高速摄像机对液滴撞击倾斜热表面的动力学过程进行了研究。结果发现，表面粗糙度显着影响淬火行为。表面粗糙度越高，喷雾冷却过程中的淬火时间越短。随着表面粗糙度的增大，液滴与固体的接触时间和液滴的铺展直径增大。从而缩短了倾斜热壁的淬火时间。同时，临界热流密度和Leidenfrost温度被证明是不敏感的表面粗糙度。
The effect of surface roughness on the dynamic behavior and the heat transfer phenomena of multiple successive micrometric water droplets impacting onto inclined heated solid surfaces has been studied experimentally. The inclination angles were 15°, 30°, and 45° from horizontal. The droplet diameters were 500 μm and 700 μm. The solid surface temperatures were decreased from 500 °C to 100 °C. The test material was stainless steel-grade 304 (SUS 304) with different surface roughness ranged fromRa0.04 up toRa10. The droplet dynamics during the impacting onto inclined hot surfaces were investigated by using high-speed video camera. It was found that the surface roughness significantly affects quenching behavior. The higher the surface roughness, the lower the quenching time during the spray cooling. The solid-droplet contact time and the droplet spread diameter increase with the increase of surface roughness. Thus causing the decrease of the quenching time of inclined hot walls. Meanwhile, the critical heat flux and Leidenfrost temperatures are shown to be insensitive to the surface roughness.