The effect of phase change on stability of convective flow in a layer of volatile liquid driven by a horizontal temperature gradient
The effect of phase change on stability of convective flow in a layer of volatile liquid driven by a horizontal temperature gradient
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DOI：
10.1017/jfm.2017.918
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发表时间：
2017-04
影响因子：
3.7
通讯作者：
R. Grigoriev;T. Qin
中科院分区：
文献类型：
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作者：
R. Grigoriev;T. Qin
由水平温度梯度驱动的挥发性液体层中的浮力-热毛细对流在多种情况下都会出现。最近的研究表明，气相（通常是蒸汽和空气的混合物）的组成对描述对流开始的临界马兰戈尼数以及观察到的对流模式有显着影响。具体来说，随着总压力或等效空气平均浓度的降低，导致对流卷出现的不稳定阈值显着增加。我们对该问题进行了线性稳定性分析，表明通过考虑热量和蒸汽在气相中的传输，可以很容易地理解这种趋势。特别是，我们表明，即使在大气条件下，当相变受到极大抑制时，气相传输也会产生显着的影响。
Buoyancy–thermocapillary convection in a layer of volatile liquid driven by a horizontal temperature gradient arises in a variety of situations. Recent studies have shown that the composition of the gas phase, which is typically a mixture of vapour and air, has a noticeable effect on the critical Marangoni number describing the onset of convection as well as on the observed convection pattern. Specifically, as the total pressure or, equivalently, the average concentration of air is decreased, the threshold of the instability leading to the emergence of convective rolls is found to increase rather significantly. We present a linear stability analysis of the problem which shows that this trend can be readily understood by considering the transport of heat and vapour through the gas phase. In particular, we show that transport in the gas phase has a noticeable effect even at atmospheric conditions, when phase change is greatly suppressed.