Ringlike Migration of a Droplet Propelled by an Omnidirectional Thermal Gradient

被引：25

作者：

Dai, Qingwen ^{[1
]}

Huang, Wei ^{[1
]}

Wang, Xiaolei ^{[1
]}

Khonsari, M. M. ^{[2
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mech & Elect Engn, Nanjing 210016, Jiangsu, Peoples R China

[2] Louisiana State Univ, Dept Mech & Ind Engn, 3283 Patrick Taylor Hall, Baton Rouge, LA 70803 USA

来源：

LANGMUIR | 2018年 / 34卷 / 13期

基金：

中国国家自然科学基金;

关键词：

HORIZONTAL SOLID-SURFACE; THERMOCAPILLARY MIGRATION; WETTABILITY GRADIENT; SELF-PROPULSION; MARANGONI FLOW; MOTION; TEMPERATURE; DYNAMICS; ACTUATION; VIBRATION;

D O I：

10.1021/acs.langmuir.7b04259

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The interfacial phenomenon associated with the ringlike motion of a liquid droplet subjected to an omnidirectional thermal gradient is investigated. An experimentally verified model is proposed for estimating the droplet migration velocity. It is shown that the unbalanced interfacial tension acting on the liquid in the radial direction provides the necessary propulsion for the migration, whereas the internal force acting on the adjoining liquid contributes to the equilibrium condition in the circumferential direction. This study puts forward the understanding of the interfacial spreading phenomenon, the knowledge of which is important in applications where liquid lubricants are encountered with directionally unstable thermal gradients.

引用

页码：3806 / 3812

页数：7

共 38 条

[1] The migration of a drop in a uniform temperature gradient at large Marangoni numbers [J].