Capillary rise of a meniscus with phase change.
Capillary rise of a meniscus with phase change.
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DOI：
10.1016/j.jcis.2008.08.016
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发表时间：
2008-11
影响因子：
9.9
通讯作者：
G. Ramon;A. Oron
中科院分区：
文献类型：
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作者：
G. Ramon;A. Oron
本文将描述毛细管中液体运动的Lucas-Washburn方程推广到考虑相变-蒸发或冷凝的影响。当界面上的温度跃变限制在一定范围内时，系统总是处于稳定的平衡态。我们发现，相变影响的平衡高度的弯月面，从单调的振荡动力学的过渡阈值，和振荡的频率，当存在。在较高的传质速率和/或大的毛细管半径，蒸汽反冲被发现是占主导地位的因素。蒸发降低了平衡高度，增加了振荡频率，降低了振荡的过渡阈值。对于冷凝，两个制度被确定：在高传质速率类似的趋势，蒸发观察，而相反的是发现低传质速率，导致增加的平衡高度，较低的振荡频率和转变阈值向单调动态。
The Lucas–Washburn equation, describing the motion of a liquid body in a capillary tube, is extended to account for the effect of phase change – evaporation or condensation. The system is found to always possess a stable equilibrium state when the temperature jump across the interface is confined to a certain range. We show that phase change affects the equilibrium height of the meniscus, the transition threshold from monotonic to oscillatory dynamics, and the frequency of oscillations, when present. At higher mass transfer rates and/or large capillary radii, vapor recoil is found to be the dominant factor. Evaporation lowers the equilibrium height, increases the oscillation frequency and lowers the transition threshold to oscillations. For condensation, two regimes are identified: at high mass transfer rates similar trends to those of evaporation are observed, whereas the opposite is found for low mass transfer rates, resulting in an increased equilibrium height, lower oscillation frequencies and a shift of the transition threshold toward monotonic dynamics.