Effect of surfactant on elongated bubbles in capillary tubes at high Reynolds number
Effect of surfactant on elongated bubbles in capillary tubes at high Reynolds number
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表面活性剂对高雷诺数毛细管内拉长气泡的影响
DOI：
10.1103/physrevfluids.5.093605
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发表时间：
2020
影响因子：
2.7
通讯作者：
Batchvarov A
中科院分区：
文献类型：
--
作者：
Batchvarov A
表面活性剂的尾部和膜动力学的细长气泡通过圆形毛细管传播的影响进行了研究，通过广泛的三维数值研究，使用混合前沿跟踪/水平集方法。重点是粘惯性制度，这发生在雷诺数的流量是远远大于单位。在这些条件下，“干净”的气泡在尾部附近表现出界面波动，其幅度随着雷诺数的增加而增加。我们进行了系统的分析，广泛的表面活性剂的性质，包括弹性，散装表面活性剂的浓度，溶解度和扩散性，在惯性效应的存在下的气泡和流动动力学的影响。结果表明，表面活性剂的引入是有效的抑制尾部波动，因为它们往往积累在气泡尾部附近。在这里，产生大的马兰戈尼应力，这导致气泡的局部“硬化”。这种效果变得更明显的较大的表面活性剂的弹性和吸附深度。在表面活性剂溶解度降低时，在气泡后部形成较厚的刚性膜区域，其中建立了库埃特膜流，而波动仍然出现在下游“清洁”膜区域的后缘处。在这种情况下，气泡长度成为一个有影响力的参数，短气泡变得完全刚性。
The effect of surfactants on the tail and film dynamics of elongated gas bubbles propagating through circular capillary tubes is investigated by means of an extensive three-dimensional numerical study using a hybrid front-tracking/level-set method. The focus is on the visco-inertial regime, which occurs when the Reynolds number of the flow is much larger than unity. Under these conditions, “clean” bubbles exhibit interface undulations in the proximity of the tail, with an amplitude that increases with the Reynolds number. We perform a systematic analysis of the impact of a wide range of surfactant properties, including elasticity, bulk surfactant concentration, solubility, and diffusivity, on the bubble and flow dynamics in the presence of inertial effects. The results show that the introduction of surfactants is effective in suppressing the tail undulations as they tend to accumulate near the bubble tail. Here large Marangoni stresses are generated, which lead to a local “rigidification” of the bubble. This effect becomes more pronounced for larger surfactant elasticities and adsorption depths. At reduced surfactant solubility, a thicker rigid film region forms at the bubble rear, where a Couette film flow is established, while undulations still appear at the trailing edge of the downstream “clean” film region. In such conditions, the bubble length becomes an influential parameter, with short bubbles becoming completely rigid.
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铠装限制了胶体悬浮液流动中的气泡。
影响因子：
3.4
作者：
Y. Yu;S. Khodaparast;H. Stone
通讯作者：
H. Stone
可溶性表面活性剂对长气泡通过圆柱形毛细管流动的影响
DOI：
--
发表时间：
1989
期刊：
影响因子：
--
作者：
G. M. Ginley;C. Radke
通讯作者：
C. Radke
DOI：
10.1016/j.ijmultiphaseflow.2014.04.009
发表时间：
2014-12-01
影响因子：
3.8
作者：
Borhani, Navid;Thome, John Richard
通讯作者：
Thome, John Richard
在多个尺度的搅拌容器中混合粘塑性流体：实验和 CFD 相结合的方法
DOI：
--
发表时间：
2019
期刊：
Chemical Engineering and Science
影响因子：
--
作者：
Andrew Russell;L. Kahouadji;Karan Mirpuri;A. Quarmby;P. Piccione;O. Matar;P. Luckham;C. Markides
通讯作者：
C. Markides
影响因子：
4.6
作者：
Giavedoni, MD;Saita, FA
通讯作者：
Saita, FA