Numerical investigation of oscillatory thermocapillary flows under zero gravity in a circular liquid film with concave free surfaces
Numerical investigation of oscillatory thermocapillary flows under zero gravity in a circular liquid film with concave free surfaces
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DOI：
10.1063/1.4943246
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发表时间：
2016-03
影响因子：
4.6
通讯作者：
Takuya Yamamoto;Y. Takagi;Y. Okano;S. Dost
中科院分区：
文献类型：
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作者：
Takuya Yamamoto;Y. Takagi;Y. Okano;S. Dost
2003年和2011年，美国宇航局宇航员佩蒂特在国际空间站（ISS）上的固体环中悬浮的水膜中进行了热毛细流动实验。在其中一个实验中，观察到振荡热毛细流动。发展的流动破坏了它沿薄膜中心线的沿着对称性。据我们所知，有没有这样的振荡热毛细流动在薄膜的研究，和流动机制引起这样的振荡流也没有得到很好的理解。为了阐明这个问题，我们进行了数值模拟研究。模拟结果表明，水膜的几何形状（膜面形状;是凹的）是一个重要的参数，并引起膜中的三种振荡流动结构，即在加热段附近发展的热液波，由于温度变化引起的对称振荡流动，以及由于沿自由边界层的流体动力学不稳定性沿着对称破缺流动。
NASA astronaut Pettit has conducted thermocapillary flow experiments in water films suspended in a solid ring onboard the International Space Station (ISS) in 2003 and 2011. In one of these experiments, an oscillatory thermocapillary flow was observed. The developed flow broke its symmetry along the centerline of the film. To the best of our knowledge, there are no studies on such oscillatory thermocapillary flows in thin films, and the flow-mechanism giving rise to such oscillatory flows is also not well understood. In order to shed light on the subject, we have carried out a numerical simulation study. The simulation results have shown that the water film geometry (film surface shape; being concave) is an important parameter and give rise to three oscillatory flow structures in the film, namely, a hydrothermal wave developing near the heated section, a symmetric oscillatory flow due to temperature variations, and a symmetry breaking flow due to the hydrodynamic instability along the free boundary layer ...