Convective instabilities in liquid layers with free upper surface under the action of an inclined temperature gradient
Convective instabilities in liquid layers with free upper surface under the action of an inclined temperature gradient
复制标题
DOI：
10.1063/1.3251755
复制
发表时间：
2009-11
影响因子：
4.6
通讯作者：
A. Mizev;D. Schwabe
中科院分区：
文献类型：
--
作者：
A. Mizev;D. Schwabe
本文介绍了在倾斜温度梯度作用下，具有自由上表面的水平液体层中对流不稳定性的实验研究结果，当同时施加水平和垂直温度梯度时。使用10 cSt（普朗特数Pr=102）的硅油作为试验流体。我们研究了不同厚度的层，以研究重力对对流模式形成的影响。结果表明，系统的行为明显地依赖于动态键数，动态键数表现出浮力和热毛细力的关系。在小的动态邦德数的情况下，当浮力的影响是最小的，四种不同的流动模式，根据垂直和水平的Marangoni数的组合，已被发现：稳定的平行流，贝纳尔-Marangoni细胞，漂流贝纳尔-Marangoni细胞，和纵向辊。当动邦德数较大时，浮力的影响变得明显。
We present the results of an experimental study of convective instabilities in a horizontal liquid layer with free upper surface under the action of an inclined temperature gradient, i.e., when horizontal and vertical temperature gradients are applied at the same time. Silicone oil of 10 cSt (Prandtl number Pr=102) was employed as the test fluid. We investigated the layers with different thicknesses to examine the influence of gravity on the formation of the convective patterns. It is found out that the system behavior appreciably depends on the dynamic Bond number, which shows a relation of buoyancy and thermocapillary forces. In the case of small dynamic Bond numbers, when the influence of buoyancy is minimal, four different flow patterns, according to the combination of the vertical and horizontal Marangoni numbers, have been found: steady parallel flow, Benard–Marangoni cells, drifting Benard–Marangoni cells, and longitudinal rolls. At larger dynamic Bond number, when the influence of buoyancy becomes...