On the motion of a sessile drop on an incline: Effect of non-monotonic thermocapillary stresses

被引:20
|
作者
Mamalis, Dimitrios [1 ]
Koutsos, Vasileios [1 ]
Sefiane, Khellil [1 ,2 ]
机构
[1] Univ Edinburgh, Inst Mat & Proc, Sch Engn, Kings Bldg, Edinburgh EH9 3FB, Midlothian, Scotland
[2] Tianjin Univ Commerce, Tianjin Key Lab Refrigerat Technol, Tianjin 300134, Peoples R China
基金
英国工程与自然科学研究理事会;
关键词
SELF-REWETTING FLUIDS; SURFACE-TENSION; SOLID-SURFACES; PHASE-CHANGE; HEAT PIPES; EVAPORATION; FLOW; SUBSTRATE; DYNAMICS; DRIVEN;
D O I
10.1063/1.4971396
中图分类号
O59 [应用物理学];
学科分类号
摘要
We studied the short-time contact-line dynamics of a self-rewetting sessile droplet sliding "freely" on a silicone oil layer, on an inclined, uniformly heated substrate under non-isothermal conditions (liquid-solid). The effect of thermocapillarity and the contribution of surface tension gradients (Marangoni effect) to the droplet motion was investigated. The temperature of the substrate in conjunction with the non-monotonic surface tension/temperature dependence of the deformed self-rewetting droplet was found to significantly affect the early-stage inertial-capillary spreading regime. Infrared (IR) thermography images were also acquired to investigate the generation of thermal patterns at the liquid surface due to the strong surface-tension gradients. Our results demonstrate that the presence of strong surface tension driven flows at the liquid interface combined with droplet deformation (contact-angle hysteresis) gives rise to complex droplet dynamics. The interplay between thermocapillary stresses and body forces results in enhanced spreading rates, temporal non-monotonic dependence of the contact-line speed, as well as the droplet motion overcoming gravity in some instances. Published by AIP Publishing.
引用
收藏
页数:5
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