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Experimental research on thermocapillary migration of drops by using digital holographic interferometry
Zhang ST; Duan L(段俐); Kang Q(康琦); Kang, Q (reprint author), Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Beijing 100190, Peoples R China.
Source PublicationEXPERIMENTS IN FLUIDS
2016
Volume57Issue:7Pages:113
ISSN0723-4864
AbstractThe thermocapillary migration of drops in a rectangular cell, with a heated top wall and a cooled bottom wall, was investigated experimentally on the ground. The rectangular test cell was 70 mm high, with a horizontal cross section of 40 mm x 40 mm. In the present experiment, 30 cSt silicon oil was used as the continuous phase, and a water-ethanol mixture was used as the drop phase, respectively. The drops ranged in size from 1.87 to 6.94 mm in diameter and were injected into the continuous phase, where the temperature gradients ranged from 0.193 to 0.484 degrees C mm(-1). In order to measure the temperature distribution of the liquid, a digital holographic interferometry was used, which was non-contact, full-field, and in-situ. The holograms were recorded, and then the corresponding wrapped phase distributions images were numerically reconstructed. The temperature distribution of the continuous phase liquid in the cell had been obtained following the unwrapping. Also, through an algebra layer analysis, the temperature distribution around the drop during the thermocapillary migration was obtained. As a result, the drop was colder than the continuous phase liquid, and a thermal wake existed behind the drop. The influence of convective transport on the drop migration was also investigated for the Marangoni number in the range of 7-174. With the increasing of the Marangoni number, the dimensionless interface temperature difference decreased, which was caused by the convective transport enhanced results in the drop thermocapillary migration velocity becoming decreased. The data were compared with previous space experiments to explain the phenomena of the drop migration. Finally, with the increasing Marangoni numbers, the length of the thermal wake region increased, and the thermal wake region became extended.
DOI10.1007/s00348-016-2193-x
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000380230600003
WOS Research AreaEngineering ; Mechanics
WOS SubjectEngineering, Mechanical ; Mechanics
Funding OrganizationThis research study was funded by the National Natural Science Foundation of China (Grant No. 11372328), by the Strategic Priority Research Program on Space Science, the Chinese Academy of Sciences: SJ-10 Recoverable Scientific Experiment Satellite (Grant Nos. XDA04020405 and XDA04020202-05), and by China Manned Space Engineering program. The authors wish to thank the team led by Professor Jianlin Zhao of Northwestern Polytechnical University for providing assistance in using the digital holographic interferometer.
DepartmentNML微重力实验流体力学
Classification二类
RankingFalse
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59762
Collection国家微重力实验室
Corresponding AuthorKang, Q (reprint author), Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Zhang ST,Duan L,Kang Q,et al. Experimental research on thermocapillary migration of drops by using digital holographic interferometry[J]. EXPERIMENTS IN FLUIDS,2016,57(7):113.
APA Zhang ST,段俐,Kang Q,&Kang, Q .(2016).Experimental research on thermocapillary migration of drops by using digital holographic interferometry.EXPERIMENTS IN FLUIDS,57(7),113.
MLA Zhang ST,et al."Experimental research on thermocapillary migration of drops by using digital holographic interferometry".EXPERIMENTS IN FLUIDS 57.7(2016):113.
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