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Title: Therminal states of thermocapillary migration of a planar droplet at moderate and large Marangoni numbers
Author: Wu ZB(武作兵)
Source: International Journal of Heat and Mass Transfer
Issued Date: 2017
Volume: 105, Pages:704-711
Abstract: In this paper, thermocapillary migration of a planar droplet at moderate and large Marangoni numbers is investigated analytically and numerically. By using the dimension-analysis method, the thermal diffusion time scale is determined as the controlling one of the thermocapillary droplet migration system. During this time, the whole thermocapillary migration process is fully developed. By using the front-tracking method, the steady/unsteady states as the terminal ones at moderate/large Marangoni numbers are captured in a longer time scale than the thermal diffusion time scale. In the terminal states, the instantaneous velocity fields in the unsteady migration process at large Marangoni numbers have the forms of the steady ones at moderate Marangoni numbers. However, in view of the former instantaneous temperature fields, the surface tension of the top surface of the droplet gradually becomes the main component of the driving force on the droplet after the inflection point appears. It is different from that the surface tension of the bottom surface of the droplet is the main component of the driving force on the droplet for the latter ones. The physical mechanism of thermocapillary droplet migration can be described as the significance of the thermal convection around the droplet is higher than/just as the thermal conduction across the droplet at large/moderate Marangoni numbers.
Language: 英语
Indexed Type: SCI ; EI
DOI: 10.1016/j.ijheatmasstransfer.2016.10.042
Classification: 一类
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/59603
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
Wu ZB. Therminal states of thermocapillary migration of a planar droplet at moderate and large Marangoni numbers[J]. International Journal of Heat and Mass Transfer,2017,105:704-711.
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