THERMAL SCIENCE

International Scientific Journal

Shuo Yang

,

Rui Ma

,

Qiaosheng Deng

,

Guofeng Wang

,

Yu Gao

,

Shanshan Ma

THE EFFECT OF UNIFORM MAGNETIC FIELD ON SPATIAL-TEMPORAL EVOLUTION OF THERMOCAPILLARY CONVECTION WITH THE SILICON OIL BASED FERROFLUID

ABSTRACT
A uniform axial or transverse magnetic field is applied on the silicon oil based ferrofluid of high Prandtl number fluid (Pr ≈ 111.67), and the effect of magnetic field on the thermocapillary convection is investigated. It is shown that the location of vortex core of thermocapillary convection is mainly near the free surface of liquid bridge due to the inhibition of the axial magnetic field. A velocity stagnation region is formed inside the liquid bridge under the axial magnetic field (B = 0.3-0.5 T). The disturbance of bulk reflux and surface flow is suppressed by the increasing axial magnetic field. There is a dynamic response of free surface deformation to the axial magnetic field, and then the contact angle variation of the free surface at the hot corner is as following, φhot, B = 0.5 T = 83.34° > φhot, B = 0.3 T = 72.16° > > φhot,B = 0.1 T = 54.21° > φhot, B = 0 T = 43.33°. The results show that temperature distribution near the free surface is less and less affected by thermocapillary convection with the increasing magnetic field, and it presents a characteristic of heat-conduction. In addition, the transverse magnetic field does not realize the fundamental inhibition for thermocapillary convection, but it transfers the influence of thermocapillary convection to the free surface.
KEYWORDS
uniform magnetic field, liquid bridge, Thermocapillary convection, level set method
PAPER SUBMITTED: 2020-02-23
PAPER REVISED: 2020-03-12
PAPER ACCEPTED: 2020-03-14
PUBLISHED ONLINE: 2020-04-04
DOI REFERENCE: https://doi.org/10.2298/TSCI200223156Y
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 6, PAGES [4159 - 4171]
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The effect of uniform magnetic field on spatial-temporal evolution of thermocapillary convection with the silicon oil based ferrofluid

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence