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Fluid Flow and Thin-Film Evolution near the Triple Line during Droplet Evaporation of Self-Rewetting Fluids
Langmuir ( IF 3.7 ) Pub Date : 2018-03-07 00:00:00 , DOI: 10.1021/acs.langmuir.8b00170 Yang Yang 1 , Leping Zhou 1 , Xiaoze Du 1 , Yongping Yang 1
Langmuir ( IF 3.7 ) Pub Date : 2018-03-07 00:00:00 , DOI: 10.1021/acs.langmuir.8b00170 Yang Yang 1 , Leping Zhou 1 , Xiaoze Du 1 , Yongping Yang 1
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The microscopic region near the triple line plays an important role in the heat and mass transfer of droplets, although the mechanisms of evaporation and internal flow remain unclear. This paper describes an experimental study of fluid flow and thin-film evolution near the triple line in sessile droplets of self-rewetting fluids, aqueous solutions of alcohols with the number of carbon atoms varying from 1 to 7, to analyze the influence of various factors on the mesoscale flows. The mechanism of internal flow for self-rewetting fluid droplets was different from that of conventional fluids, and hence, a novel expression of the in-plane average velocity was fitted for them. The temporal and spatial evolution of the thin-film thickness near the triple line during droplet evaporation was obtained by using a proposed subregion method, which was developed from an evanescent-wave-based multilayer nanoparticle image velocimetry technique. The self-rewetting fluids are conducive to increase the microscopic critical contact angle and the energy barrier of the contact line, which reduces the rate of thin-film thickness variation. The inhibited impact of self-rewetting fluids on evaporation increases gradually with an increasing number of carbon atoms.
中文翻译：
自润湿液体的液滴蒸发过程中三重线附近的流体流动和薄膜演化
尽管蒸发和内部流动的机理仍不清楚，但三重线附近的微观区域在液滴的传热和传质中起着重要作用。本文描述了一种自研究流体的无滴液滴，碳原子数为1到7的醇类水溶液中的三重线附近的流体流动和薄膜演变的实验研究，以分析各种因素的影响在中尺度流动。自润湿液滴的内部流动机理与常规流体不同，因此，对它们进行了面内平均速度的新颖表达。液滴蒸发过程中三线附近的薄膜厚度随时间和空间的变化是通过使用拟议的子区域方法获得的，它是基于an逝波的多层纳米颗粒图像测速技术开发的。自润湿液体有利于增加微观临界接触角和接触线的能垒，从而降低了薄膜厚度的变化率。自粘性流体对蒸发的抑制作用随着碳原子数的增加而逐渐增加。
更新日期：2018-03-07
中文翻译：
自润湿液体的液滴蒸发过程中三重线附近的流体流动和薄膜演化
尽管蒸发和内部流动的机理仍不清楚，但三重线附近的微观区域在液滴的传热和传质中起着重要作用。本文描述了一种自研究流体的无滴液滴，碳原子数为1到7的醇类水溶液中的三重线附近的流体流动和薄膜演变的实验研究，以分析各种因素的影响在中尺度流动。自润湿液滴的内部流动机理与常规流体不同，因此，对它们进行了面内平均速度的新颖表达。液滴蒸发过程中三线附近的薄膜厚度随时间和空间的变化是通过使用拟议的子区域方法获得的，它是基于an逝波的多层纳米颗粒图像测速技术开发的。自润湿液体有利于增加微观临界接触角和接触线的能垒，从而降低了薄膜厚度的变化率。自粘性流体对蒸发的抑制作用随着碳原子数的增加而逐渐增加。
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