The effect of aspect ratio and axial magnetic field on thermocapillary convection in liquid bridges with a deformable free-surface

Three-dimensional numerical simulations are performed to analyze the effect of the aspect ratio Ar and axial magnetic field on thermocapillary convection in liquid bridges with deformable free-surface under microgravity, in which the volume of fluid (VOF) method is adopted to track the free-surface...

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Bibliographic Details
Published in:Engineering applications of computational fluid mechanics 2016-01, Vol.10 (1), p.17-29
Main Authors: Zhang, Yin, Huang, Hulin, Zhang, Xidong, Zou, Yong, Tang, Shuojie
Format: Article
Language:English
Subjects:
Aspect ratio
axial magnetic field
Computational fluid dynamics
Computer simulation
deformable free-surface
Deformation effects
Electrons
Formability
Free surfaces
Hartmann number
Liquid bridges
Magnetic fields
Magnetism
Microgravity
Thermocapillary convection
VOF
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Summary:Three-dimensional numerical simulations are performed to analyze the effect of the aspect ratio Ar and axial magnetic field on thermocapillary convection in liquid bridges with deformable free-surface under microgravity, in which the volume of fluid (VOF) method is adopted to track the free-surface movement. The simulation results elucidate that the oscillation wave number m and frequency of temperature fluctuation decrease with increasing Ar, while the amplitude of temperature fluctuation increases with increasing Ar. The deformation ratio ξ of the free-surface increases as Ar increases. The numerical results also reveal that the axial magnetic field causes a concentration of convection vortexes near the free-surface and effectively suppresses the flow in both the radial and axial directions. Moreover, the axial magnetic field effectively damps free-surface deformation, so that the deformation ratio ξ decreases as the Hartmann number Ha increases. The temperature displays a uniform and linear distribution along the free-surface and the axis of molten zone when B a  = 0.3 T.
ISSN:1994-2060
1997-003X
DOI:10.1080/19942060.2015.1101401