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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part C. Journal of mechanical engineering science >Lattice Boltzmann modeling for the coalescence between a free droplet in gases and a sessile droplet on wettable substrate with contact angle hysteresis
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Lattice Boltzmann modeling for the coalescence between a free droplet in gases and a sessile droplet on wettable substrate with contact angle hysteresis

机译：与接触角滞后的可润湿基板上的自由液滴与柄液滴之间的聚结的格子Boltzmann建模

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摘要

The coalescence between a free droplet and a sessile droplet on wettable substrate is numerically studied. The axisymmetric lattice Boltzmann method for two-phase flows is used in modeling. Here the contact angle hysteresis (prescribed by advancing angle θ A and receding angle θ R ) is taken into account. The effects of Ohnesorge number ( Oh ), contact angle and its hysteresis, and the radius of the free droplet on the coalescence dynamics are investigated in detail. The Oh numbers ranging from 0.02 to 0.15 here makes the radius of the liquid bridge r and the time t follow power law. Also, Oh has remarkable impact on the development of capillary wave and on the amount of kinetic energy released from coalescence. It is found that the curve of the wetting radius varying with time includes several plateau stages, which is a typical characteristic for the effect of contact angle hysteresis. The larger window of contact angle hysteresis would result in smaller steady wetting radius after coalescence. Compared with the existence of contact angle hysteresis, the absence of contact angle hysteresis makes the droplets system release more kinetic energy during the coalescence but the released kinetic energy decays more rapidly and soon reduces to zero. Oppositely, if the contact angle hysteresis exists, the released kinetic energy would oscillate for a period of time before approaching zero.
机译：在数值上研究了自由液滴和可湿性底物上的柄液滴之间的聚结。用于两相流的轴对称晶格Boltzmann方法用于建模。这里考虑接触角滞后（通过推进角度θa和后退角度θr规定）。研究了OHNESORGE（OH），接触角及其滞后的影响以及聚结动力学的自由液滴的半径。这里的OH数字在这里为0.02至0.15，使液体桥R和时间t跟随电力法的半径。此外，OH对毛细波的发育具有显着影响以及从聚结释放的动能量。发现润湿半径随时间变化的曲线包括几个平台阶段，这是接触角滞后效果的典型特性。较大的接触角滞后窗口将导致聚结后较小的稳定润湿半径。与接触角滞后的存在相比，没有接触角滞后使得液滴系统在聚结期间释放更多的动能，但释放的动能更快地衰减并很快减少到零。相反，如果存在接触角滞后，则释放的动能将在接近零之前振荡一段时间。

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