Time-dependent motion of a confined bubble in a tube: transition between two steady states

Time-dependent motion of a confined bubble in a tube: transition between two steady states
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管中受限气泡的时间相关运动:两个稳态之间的转变

DOI:
10.1017/jfm.2018.835
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发表时间:
2018
影响因子:
3.7
通讯作者:
Stone, Howard A.
Stone, Howard A.
中科院分区:
工程技术2区
文献类型:
--
作者:
Yu, Yingxian Estella;Zhu, Lailai;Shim, Suin;Eggers, Jens;Stone, Howard A.

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当受限气泡在不考虑重力影响的圆柱形毛细管内稳定平移时,气泡表面和管壁之间会形成一层均匀的液体薄膜。在这项工作中,我们通过考虑气泡在两个不同气泡速度的稳态之间调节其膜厚分布时的过渡运动来研究这种稳态是如何建立的。在转变过程中,两个均匀的薄膜区域共存,由一个阶梯状的过渡区隔开。过渡运动还需要修改气泡后部附近的薄膜溶液,这取决于两个毛细管数的比率。这些理论结果得到了实验和数值模拟的验证。
When a confined bubble translates steadily in a cylindrical capillary tube, without the consideration of gravity effects, a uniform thin film of liquid separates the bubble surface and the tube wall. In this work, we investigate how this steady state is established by considering the transitional motion of the bubble as it adjusts its film thickness profile between two steady states, characterized by two different bubble speeds. During the transition, two uniform film regions coexist, separated by a step-like transitional region. The transitional motion also requires modification of the film solution near the rear of the bubble, which depends on the ratio of the two capillary numbers. These theoretical results are verified by experiments and numerical simulations.
铠装限制了胶体悬浮液流动中的气泡。
DOI: --
发表时间: 2017
期刊: Soft Matter
影响因子: 3.4
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