The interfacial dynamics of the micrometric droplet diameters during the impacting onto inclined hot surfaces
The interfacial dynamics of the micrometric droplet diameters during the impacting onto inclined hot surfaces
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DOI：
10.1016/j.ijheatmasstransfer.2018.05.023
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发表时间：
2018-11
影响因子：
5.2
通讯作者：
Deendarlianto;Y. Takata;A. Widyatama;A. I. Majid;Ardi Wiranata;A. Widyaparaga;M. Kohno;S. Hidaka;Indarto
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文献类型：
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作者：
Deendarlianto;Y. Takata;A. Widyatama;A. I. Majid;Ardi Wiranata;A. Widyaparaga;M. Kohno;S. Hidaka;Indarto
实验研究了微米级液滴撞击倾斜热表面时的界面动力学。表面温度从500 °C下降到100 °C时，液滴与水平方向成15°、30°和45°不同的倾角。液滴直径分别为500 μm和700 μm。被测材料为不锈钢级304(表面粗糙度从Ra0.04到Ra10)。用15,000 fps的高速摄像机研究了倾斜热表面撞击过程中的界面动力学。研究发现，取决于表面温度，液滴蒸发及其反弹过程对液滴从倾斜表面分离的机理起着重要作用。确定了微细液滴撞击斜热表面过程中界面演化的三个瞬态区。此外，还给出了接触角前移和后退等重要物理参数对界面动力学的贡献。
The interfacial dynamics of the micrometric size liquid droplets during impact onto inclined hot surfaces have been experimentally studied. The inclination angles were varied at 15°, 30°, and 45° from horizontal for surface temperatures were decreasing from 500 °C to 100 °C. The droplet diameters tested were 500 μm and 700 μm. The tested material was stainless steel-grade 304 (SUS 304) with varying surface roughness ranging from Ra 0.04 up to Ra 10. The interfacial dynamics during the impact onto inclined hot surfaces were investigated by using a high-speed video camera with the frame speed of 15,000 fps.The objectives of this study are to provide insight into the dynamic behaviors of contact angles and dependence of importance parameters at various surface temperatures. It was found that depending on the surface temperature the droplet evaporation and its bouncing process play an important role on the droplet detachment mechanisms from the inclined surface. Three transient regions of the interfacial evolution during the micrometric droplets impacting onto oblique hot surface were identified. Moreover, the contribution of the important physical parameters, such as, advancing and receding contact angles on the interfacial dynamics are presented.