Thermocapillary droplet migration in a vertical temperature gradient controlled by thermal radiations

doi:10.1063/5.0082867

IMECH-IR > 非线性力学国家重点实验室

	Thermocapillary droplet migration in a vertical temperature gradient controlled by thermal radiations
	Wu ZB(武作兵)1,2
通讯作者	Wu, Zuo-Bing(wuzb@lnm.imech.ac.cn)
发表期刊	PHYSICS OF FLUIDS
	2022-02-01
卷号	34 期号:2 页码:17
ISSN	1070-6631
摘要	Thermocapillary migration of a droplet in a vertical temperature gradient controlled by uniform and non-uniform thermal radiations is theoretically analyzed and numerically investigated. A non-dimensionlized thermal radiation number is proposed to quantitatively depict the intensity ratio of the thermal radiation flux to the uniform temperature gradient. From the momentum and energy equations at zero limits of Reynolds and Marangoni numbers, analytical results for the uniform and non-uniform thermal radiations are determined. The steady migration velocity raises with the increasing of the thermal radiation number. By using the front-tracking method, it is observed that thermocapillary droplet migration under the uniform thermal radiation at moderate Marangoni and moderate thermal radiation numbers reaches a steady process. The steady migration velocity decreases with the increasing of Marangoni number and increases with the increasing of thermal radiation number. Moreover, the intensity of thermal energy transferred from the interface to both fluids depends on the volume heat capacity ratio. For the larger/smaller volume heat capacity ratio, more heat is transferred into the continuous phase fluid/the droplet. Furthermore, when the uniform thermal radiation is replaced by the non-uniform ones, the time evolutions, the structures of temperature fields, and parameter dependencies of thermocapillary droplet migration at moderate Marangoni and moderate thermal radiation numbers remain qualitatively unchanged. This study provides a profound understanding of thermocapillary droplet migration in a vertical temperature gradient controlled by thermal radiations, which is of great significance for practical applications in microgravity and microfluidic fields.
DOI	10.1063/5.0082867
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000761003900001
关键词[WOS]	TENSION-DRIVEN FLOWS ; MOTION
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
资助项目	National Natural Science Foundation of China[11172310] ; National Natural Science Foundation of China[11472284] ; CAS Strategic Priority Research Program[XDB22040403]
项目资助者	National Natural Science Foundation of China ; CAS Strategic Priority Research Program
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Wu, Zuo-Bing
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/88755
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wu ZB. Thermocapillary droplet migration in a vertical temperature gradient controlled by thermal radiations[J]. PHYSICS OF FLUIDS,2022,34,2,:17.
APA	武作兵.(2022).Thermocapillary droplet migration in a vertical temperature gradient controlled by thermal radiations.PHYSICS OF FLUIDS,34(2),17.
MLA	武作兵."Thermocapillary droplet migration in a vertical temperature gradient controlled by thermal radiations".PHYSICS OF FLUIDS 34.2(2022):17.

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