Benard-Marangoni instability in sessile droplet evaporating at constant contact angle mode on heated substrate
Benard-Marangoni instability in sessile droplet evaporating at constant contact angle mode on heated substrate
复制标题
固定液滴在加热基底上以恒定接触角模式蒸发的贝纳德-马兰戈尼不稳定性
DOI：
10.1016/j.ijheatmasstransfer.2019.01.082
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Feng Lin
中科院分区：
文献类型：
--
作者：
Zhu Ji Long;Shi Wan Yuan;Feng Lin
Marangoni instabilities in a sessile droplet evaporating at constant contact angle mode on a heated substrate were investigated through a series of experiments. The quasi-steady state flower-like patterns of Bénard-Marangoni instabilities were observed, which uniformly distributed along the azimuthal direction of droplet. With the receding of triple line, the cell number of the Bénard-Marangoni convection decreases one by one following a square function of the evaporating time while the flower-like pattern maintains the quasi-steady state continuously. Different from the classical polygonal cells in flat liquid layer, the shape of cells in droplet is circular-arc. The critical Marangoni numbers for the incipience as well as those for the disappearance of the Bénard-Marangoni patterns were determined experimentally. Besides numerical simulations were conducted and the detailed characteristics of the Bénard-Marangoni instability patterns inside the droplet are explained thoroughly.
