IMECH-IR  > 非线性力学国家重点实验室
Thermocapillary migration of a planar droplet at moderate and large Marangoni numbers
Wu ZB(武作兵); Hu WR(胡文瑞); wuzb@lnm.imech.ac.cn
Source PublicationActa Mechanica
2012
Volume223Issue:3Pages:609-626
ISSN0001-5970
Abstract

Thermocapillary migration of a planar non-deformable droplet in flow fields with two uniform temperature gradients at moderate and large Marangoni numbers is studied numerically by using the front-tracking method. It is observed that the thermocapillary motion of planar droplets in the uniform temperature gradients is steady at moderate Marangoni numbers, but unsteady at large Marangoni numbers. The instantaneous migration velocity at a fixed migration distance decreases with increasing Marangoni numbers. The simulation results of the thermocapillary droplet migration at large Marangoni numbers are found in qualitative agreement with those of experimental investigations. Moreover, the results concerned with steady and unsteady migration processes are further confirmed by comparing the variations of temperature fields inside and outside the droplet. It is evident that at large Marangoni numbers the weak transport of thermal energy from outside of the droplet into inside cannot satisfy the condition of a steady migration process, which implies that the advection around the droplet is a more significant mechanism for heat transfer across/around the droplet at large Ma numbers. Furthermore, from the condition of overall steady-state energy balance in the flow domain, the thermal flux across its surface is studied for a steady thermocapillary droplet migration in a flow field with uniform temperature gradient. By using the asymptotic expansion method, a non-conservative integral thermal flux across the surface is identified in the steady thermocapillary droplet migration at large Marangoni numbers. This non-conservative flux may well result from the invalid assumption of a quasi-steady state, which indicates that the thermocapillary droplet migration at large Marangoni numbers cannot reach a steady state and is thus an unsteady process.

Subject Area流体力学
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000302239100012
DepartmentLNM微纳米流体力学
Classification二类
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/45853
Collection非线性力学国家重点实验室
国家微重力实验室
Corresponding Authorwuzb@lnm.imech.ac.cn
Recommended Citation
GB/T 7714
Wu ZB,Hu WR,wuzb@lnm.imech.ac.cn. Thermocapillary migration of a planar droplet at moderate and large Marangoni numbers[J]. Acta Mechanica,2012,223(3):609-626.
APA Wu ZB,Hu WR,&wuzb@lnm.imech.ac.cn.(2012).Thermocapillary migration of a planar droplet at moderate and large Marangoni numbers.Acta Mechanica,223(3),609-626.
MLA Wu ZB,et al."Thermocapillary migration of a planar droplet at moderate and large Marangoni numbers".Acta Mechanica 223.3(2012):609-626.
Files in This Item: Download All
File Name/Size DocType Version Access License
10.1007_s00707-011-0(1471KB) 开放获取LicenseView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wu ZB(武作兵)]'s Articles
[Hu WR(胡文瑞)]'s Articles
[wuzb@lnm.imech.ac.cn]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wu ZB(武作兵)]'s Articles
[Hu WR(胡文瑞)]'s Articles
[wuzb@lnm.imech.ac.cn]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wu ZB(武作兵)]'s Articles
[Hu WR(胡文瑞)]'s Articles
[wuzb@lnm.imech.ac.cn]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 10.1007_s00707-011-0587-7.pdf
Format: Adobe PDF
This file does not support browsing at this time
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.