Pattern selection for convective flow in a liquid bridge subjected to remote thermal action
Pattern selection for convective flow in a liquid bridge subjected to remote thermal action
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DOI：
10.1063/5.0101901
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发表时间：
2022-08
影响因子：
4.6
通讯作者：
Y. Gaponenko;T. Yano;K. Nishino;Satoshi Matsumoto;V. Shevtsova
中科院分区：
文献类型：
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作者：
Y. Gaponenko;T. Yano;K. Nishino;Satoshi Matsumoto;V. Shevtsova
热毛细管/浮力流动的稳定性受到远程热源的影响。本文对在Marangoni力和浮力作用下以及在远距离热扰动影响下发展的液桥中的对流进行了非线性两相计算研究。气相(空气)占据一个典型的环形容器，保持液桥(正庚烷，Pr=14)，扰动以容器外壁上的热/冷点的形式局部施加。通过在较大范围内改变热源HF的强度，研究了两个温差ΔT的热波不稳定性和模式选择。在临界点附近，在所有情况下，不稳定性都以驻波的形式出现，但方位波数取决于外部扰动是由冷却(m=2)还是由加热(m=1)引起的。进一步进入超临界区，高于阈值的45%，在有热扰动区−200<；HF<；50中，流型包括但不限于方位波数m=2的热液行波。对于较热的扰动，不稳定发展为行波或驻波的形式，取决于HF，主模m=1，但存在强烈的其他模。
The stability of thermocapillary/buoyant flows is affected by an remote thermal source. We present a nonlinear two-phase computational study of convection in a liquid bridge that develops under the action of Marangoni and buoyancy forces, as well as under the influence of distant thermal disturbances. The gas phase (air) occupies a typical annular container holding a liquid bridge (n-decane, Pr=14), and the disturbances are locally imposed in the form of hot/cold spots on the outer wall of the container. The hydrothermal wave instability and pattern selection have been explored for two temperature differences ΔT by varying the intensity of thermal source Hf over a wide range. Not far from the critical point, in all the cases, the instability emerges in the form of a standing wave, but the azimuthal wavenumber depends on whether the external perturbation is caused by cooling (m=2) or by heating (m=1). Further into supercritical area, 45% above the threshold, in the region with thermal perturbations −200 < Hf < 50, the flow pattern comprises, but is not limited to, a hydrothermal traveling wave with the azimuthal wavenumber m=2. For hotter perturbations, the instability develops either in the form of traveling or standing waves, depending on Hf, with the prevailing mode m=1, but with a strong presence of other modes.