Transition of Marangoni convection instability patterns during evaporation of sessile droplet at constant contact line mode
Transition of Marangoni convection instability patterns during evaporation of sessile droplet at constant contact line mode
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恒定接触线模式下固着液滴蒸发过程中马兰戈尼对流不稳定模式的转变
DOI：
10.1016/j.ijheatmasstransfer.2019.119138
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发表时间：
2020-02
影响因子：
5.2
通讯作者：
Shi Wan-Yuan
中科院分区：
文献类型：
--
作者：
Wang Tian-Shi;Shi Wan-Yuan
Due to continuous variation of contact angle of a sessile droplet during evaporation at constant contact line mode, the behaviors of Marangoni convection inside the droplet would inevitably vary with evaporation. In order to understand these behaviors, the Marangoni convection instability patterns and their transition phenomena in a sessile droplet during evaporation are investigated through a series of experiments. For easily volatile droplet of methanol the hydrothermal waves occur firstly near the three-phase contact line and then they are transformed to Bénard-Marangoni cells when the contact angle is lower than a critical value. The hydrothermal waves finally disappear with only Bénard-Marangoni cells remaining in the droplet when the contact angle is below the second threshold. For highly volatile droplet of R-113 the stationary longitudinal rolls appear firstly and then they are replaced by the Bénard-Marangoni cells. The basic linear flow in R-113 droplet caused by fast evaporation is a crucial reason to form the stationary longitudinal rolls in it. The critical conditions for the transitions between these kinds of the Marangoni convection instability patterns are determined and the underlying mechanisms of these transition phenomena are analyzed carefully.
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