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Terminal states of thermocapillary migration of a planar droplet at moderate and large Marangoni numbers
Wu ZB(武作兵)
Source PublicationINTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
2017
Volume105Issue:6Pages:704-711
ISSN0017-9310
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. (C) 2016 Elsevier Ltd. All rights reserved.

KeywordInterfacial Tension Thermocapillary Migration Of a Droplet Large Marangoni Numbers Microgravity
DOI10.1016/j.ijheatmasstransfer.2016.10.042
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000389556800065
WOS KeywordInterfacial Tension ; Thermocapillary Migration Of a Droplet ; Large Marangoni Numbers ; Microgravity
WOS Research AreaThermodynamics ; Engineering ; Mechanics
WOS SubjectThermodynamics ; Engineering, Mechanical ; Mechanics
Funding OrganizationNational Natural Science Foundation of China [11172310, 11472284]
DepartmentLNM微纳米流体力学
Classification一类
Ranking1
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59979
Collection非线性力学国家重点实验室
Corresponding AuthorWu ZB(武作兵)
Recommended Citation
GB/T 7714
Wu ZB. Terminal states of thermocapillary migration of a planar droplet at moderate and large Marangoni numbers[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2017,105(6):704-711.
APA Wu ZB.(2017).Terminal states of thermocapillary migration of a planar droplet at moderate and large Marangoni numbers.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,105(6),704-711.
MLA Wu ZB."Terminal states of thermocapillary migration of a planar droplet at moderate and large Marangoni numbers".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 105.6(2017):704-711.
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