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Title: Effect of Marangoni Number on Thermocapillary Convection and Free-Surface Deformation in Liquid Bridges
Author: Zhang Yin1; Huang Hu-Lin1; Zhou Xiao-Ming2; Zhu Gui-Ping1; Zou Yong1
Source: JOURNAL OF THERMAL SCIENCE
Issued Date: 2016-04-01
Volume: 25, Issue:2, Pages:178-187
Keyword: thermocapillary convection ; microgravity ; Floating zone ; deformable free-surface ; VOF ; liquid bridge
DOI: 10.1007/s11630-016-0849-8
DOC Type: Article
English Abstract: Floating zone technique is a crucible-free process for growth of high quality single crystals. Unstable thermocapillary convection is a typical phenomenon during the process under microgravity. Therefore, it is very important to investigate the instability of thermocapillary convection in liquid bridges with deformable free-surface under microgravity. In this works, the Volume of Fluid (VOF) method is employed to track the free-surface movement. The results are presented as the behavior of flow structure and temperature distribution of the molten zone. The impact of Marangoni number (Ma) is also investigated on free-surface deformation as well as the instability of thermocapillary convection. The free-surface exhibits a noticeable axisymmetric (but it is non-centrosymmetric) and elliptical shape along the circumferential direction. This specific surface shape presents a typical narrow 'neck-shaped' structure with convex at two ends of the zone and concave at the mid-plane along the axial direction. At both theta = 0 degrees and theta = 90 degrees, the deformation ratio increases rapidly with Ma at first, and then increases slowly. Moreover, the hydrothermal wave number m and the instability of thermocapillary convection increase with Ma.
WOS Headings: Science & Technology ; Physical Sciences ; Technology
WOS Subject: Thermodynamics ; Engineering, Mechanical
WOS Subject Extended: Thermodynamics ; Engineering
WOS Keyword Plus: PRANDTL-NUMBER ; FLOATING-ZONE ; FLOW ; INSTABILITIES ; MICROGRAVITY ; TEMPERATURE ; STABILITY ; FLUID ; MODEL
Indexed Type: SCI
Funder: National Natural Science Foundation of China(51276089) ; Six-talents Peaks project of Jiangsu Province(2015-XNY-003)
Language: 英语
WOS ID: WOS:000372382600010
Citation statistics:
Content Type: 期刊论文
URI: http://ir.etp.ac.cn/handle/311046/112447
Appears in Collections:中国科学院工程热物理所(论文库)_期刊论文(SCI)

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description.institution: 1.Nanjing Univ Aeronaut & Astronaut, Coll Energy & Power Engn, Nanjing 210016, Peoples R China
2.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China
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