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Effects of Gravitational Force and Surface Orientation on the Jumping Velocity and Energy Conversion Efficiency of Coalesced Droplets
Microgravity Science and Technology ( IF 1.8 ) Pub Date : 2020-10-30 , DOI: 10.1007/s12217-020-09841-9
Xin Wang , Bo Xu , Zhenqian Chen , Yang Yang , Qian Cao

Due to potential applications in numerous fields (self-cleaning, anti-frosting, condensation enhancement, etc.), coalescence-induced droplet jumping has been investigated extensively by numerical simulations and experiments over the past decade. In this paper, the jumping dynamics of coalesced droplets on the microstructured superhydrophobic surfaces is simulated using the lattice Boltzmann model. Effects of gravity, inclined angle and droplet radius ratio on the jumping velocity and energy conversion efficiency are studied. The numerical results demonstrate that jumping droplets on inclined surfaces driven by the tangential gravity can successfully detach from the surface without returning to the original spot. The jumping velocity can be improved by a larger inclined angle. Coalescence-induced jumping of two-mismatched droplets on the horizontal surface can also produce a horizontal velocity that drives them detaching from the surface along x direction or coalescing with other droplets. Both jumping velocity and energy conversion efficiency are reduced by a lower radius ratio and a larger gravitational coefficient. In addition, no jumping behavior can be observed when energy conversion efficiency is less than 2%.



中文翻译:

重力和表面取向对聚结液滴的跳跃速度和能量转换效率的影响

由于在许多领域(自清洁,防霜,增强结露等)的潜在应用,在过去的十年中,通过数值模拟和实验对聚结引起的液滴跳跃进行了广泛的研究。本文利用晶格玻尔兹曼模型模拟了聚结液滴在微结构化超疏水表面上的跳跃动力学。研究了重力,倾斜角和液滴半径比对跳跃速度和能量转换效率的影响。数值结果表明,在切向重力的驱动下,倾斜表面上的跳跃液滴可以成功地脱离表面,而不会返回到原始点。可以通过更大的倾斜角来提高跳跃速度。x方向或与其他液滴合并。较低的半径比和较大的重力系数会同时降低跳跃速度和能量转换效率。另外,当能量转换效率小于2%时,没有观察到跳跃行为。

更新日期:2020-10-30
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