几何形状对颗粒链蒸发去湿的影响
Effect of geometry on the dewetting of granular chains by evaporation
摘要：
尽管最近取得了进展，但理解颗粒介质中的蒸发或干燥仍然很复杂。蒸发取决于液体从本体到表面穿过连接的膜网络的传输。在这项研究中，我们调查的稳定性的膜网络作为一个功能的颗粒包装。使用一个受控的实验方法，我们改变了颗粒填料的几何形状，并显示在蒸发过程中的液体膜网络的高度的变化，作为包装从松散的包装转移到紧密包装的安排。该高度可以根据流体静压力和垂直膜网络中两点之间的压差之间的平衡来计算。本文采用数值模拟的方法计算了空气/水两相区的蒸发前缘和蒸发前缘的压力。结果表明，模型和实验之间有很好的协议。
英文摘要：
Understanding evaporation or drying in granular media still remains complex despite recent advancements. Evaporation depends on liquid transport across a connected film network from the bulk to the surface. In this study, we investigate the stability of film networks as a function of granular packing. Using a controlled experimental approach, we vary the granular packing geometry and show the changes in the height of the liquid film network during evaporation as packing shifts from a loose-packed to a close-packed arrangement. This height can be calculated from an equilibrium between hydrostatic pressure and the pressure difference between two points in the vertical film network. We use a simulation approach to calculate the pressure in both the percolating front and evaporating front within the two-phase zone of air/water mixture. Results show good agreement between the model and the experiment.
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