Simulation of drop impact on substrate with micro-wells
Simulation of drop impact on substrate with micro-wells
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DOI：
10.1063/5.0093826
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发表时间：
2022-06-01
影响因子：
4.6
通讯作者：
Lian, Yongsheng
中科院分区：
文献类型：
--
作者：
Islam, Ahmed;Sussman, Mark;Lian, Yongsheng
在本文中，我们通过数值模拟研究了液滴撞击在微孔基底上的非润湿性现象。采用密度投影法和自适应网格加密算法求解三维不可压Navier-Stokes方程。一个非常尖锐的界面重建算法，被称为矩的流体方法，被用来识别多材料和多相存在于计算域。我们的模拟预测，具有深腔的微孔可以显着减少液滴撞击时的固液接触。将在微孔基底上的液滴冲击的结果与在平坦基底上的液滴冲击的结果进行比较。这两种情况下，在润湿面积，铺展比，和动能方面观察到显着差异。我们的模拟表明，在相同的条件下，液滴更容易从微孔基底比从平坦表面跳跃，从而导致更小的润湿面积和更短的接触时间。根据仿真结果，绘制了水滴跳跃区域图。微孔基底具有比平坦表面基底更大的区域。最后，我们提出了一个平面基板和基板之间的比较分析与密集阵列的微孔，因此，表明阵列的微孔优于光滑的基板方面的非润湿性和液滴芯吸能力。由AIP Publishing独家授权出版。
In this paper, we numerically investigate drop impact on a micro-well substrate to understand the phenomena of non-wettability. The simulation is carried out by solving three-dimensional incompressible Navier-Stokes equations using a density projection method and an adaptive grid refinement algorithm. A very sharp interface reconstruction algorithm, known as the moment-of-fluid method, is utilized to identify the multi-materials and multi-phases present in the computation domain. Our simulations predicted that a micro-well with a deep cavity can significantly reduce a solid-liquid contact in the event of drop impact. The results from the drop impact on the micro-well substrate are compared with results from drop impact on a flat substrate. Significant differences are observed between these two cases in terms of wetted area, spreading ratio, and kinetic energy. Our simulation shows that under the same conditions, a drop is more apt to jump from a micro-well substrate than from a flat surface, resulting in smaller wetted area and shorter contact time. Based on the simulation results, we draw a drop jumping region map. The micro-well substrate has a larger region than the flat surface substrate. Finally, we present a comparative analysis between a flat substrate and a substrate constructed with a dense array of micro-wells and, therefore, show that the array of micro-wells outperforms the smooth substrate with regard to non-wettability and drop wicking capability. Published under an exclusive license by AIP Publishing.