风力和重力强迫跌落脱钉
Wind- and Gravity-Forced Drop Depinning
摘要：
液滴由于表面张力而粘附到固体表面，但由于风或重力的作用，液滴可以沿着表面脱钉并往回跑。这项工作开发了一个简单的机械模型，结合重力和高雷诺数风强迫和测试，模型使用粗糙的铝表面上的水滴脱钉。在非倾斜表面上，滴depin在恒定的临界韦伯数，$W\!e_{\mathrm{crit}}=7.9$，对于目前的润湿性条件。在倾斜表面上，$W\!e_{\mathrm{crit}}$随Bond数和非强制液滴的宽高比的乘积线性减小。在$W\!e_{\mathrm{crit}}=4$之上和之下的不同的风和重力主导的强迫制度的线性斜率是不同的。接触线形状和液滴轮廓形状在脱钉条件下测量，但不能充分解释两个强制制度之间的差异。
英文摘要：
Liquid drops adhere to solid surfaces due to surface tension but can depin and run back along the surface due to wind or gravity forcing. This work develops a simple mechanistic model for depinning by combined gravity and high-Reynolds-number wind forcing and tests that model using water drops on a roughened aluminum surface. On non-inclined surfaces, drops depin at a constant critical Weber number, $W\!e_{\mathrm{crit}}=7.9$, for the present wettability conditions. On inclined surfaces, $W\!e_{\mathrm{crit}}$ decreases linearly with the product of the Bond number and the width-to-height aspect ratio of the unforced drop. The linear slope is different in distinct wind- and gravity-dominated forcing regimes above and below $W\!e_{\mathrm{crit}}=4$. Contact line shapes and drop profile shapes are measured at depinning conditions but do not adequately explain the differences between the two forcing regimes.
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