Thermocapillary-driven coherent structures by low-Stokes-number particles and their morphology in high-aspect-ratio liquid bridges
Thermocapillary-driven coherent structures by low-Stokes-number particles and their morphology in high-aspect-ratio liquid bridges
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DOI：
10.1016/j.ijheatmasstransfer.2022.123772
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发表时间：
2022-12-23
影响因子：
5.2
通讯作者：
Ueno，Ichiro
中科院分区：
文献类型：
--
作者：
Terasaki，Sayo;Sensui，Shogo;Ueno，Ichiro
实验研究了低斯托克斯数粒子的热毛细驱动的相干结构。在高宽比或大长宽比的半区液桥中，诱导了随时间变化的对流。我们成功地实现了相干结构，由于所谓的热液波不稳定性，这种相干结构在方位波数上遵循m HTW=1的行波型对流，看起来是刚性旋转的。在旋转坐标系中，通过制备薄的光片，得到了形成相干结构的单个粒子在不同高度的庞加莱截面。还描绘了形成相干结构的多个粒子的投影分布，以检查与Poincaré点的相关性。通过跟踪液桥中呈现翻转运动的粒子，讨论了相干结构的稳定性。
Thermocapillary-driven coherent structures by low-Stokes-number particles are experimentally investigated. Time-dependent convection is induced in a tall or high-aspect-ratio half-zone liquid bridge. We successfully realize coherent structures, which seem rigidly rotating by following the traveling-wave-type convection of m HTW= 1 in azimuthal wave number due to so-called hydrothermal-wave instability. The Poincaré sections at different heights of a single particle forming the coherent structure are obtained in the rotating frame of reference by preparing a thin light sheet. Projected distribution of the multiple particles forming the coherent structure are also depicted to examine the correlation with the Poincaré points. The stability of the coherent structures is discussed by tracking the particles exhibiting turnover motion in the liquid bridge.