Effect of Marangoni number on thermocapillary convection in a liquid bridge under microgravity

Affiliation of Author(s):航天学院

Journal:INTERNATIONAL JOURNAL OF THERMAL SCIENCES

Key Words:Liquid bridge Marangoni number Thermo-solutal capillary convection Oxygen concentration Convection instability Interlaced vertical bar waves

Abstract:Three dimensional numerical simulations are carried out to investigate the effect of Marangoni number (Ma) on the thermo-solutal capillary convection in a liquid bridge under microgravity. Upper and lower disks of the liquid bridge maintain a constant temperature and solute concentration. The computational results show that two rows of interlaced vertical waves form at the center of the r = 0.5 cm ring surface. The number of the interlaced vertical bar waves increases from 10 to 12 with Ma increase from 3.58 x 10(3) to 5.37 x 10(3), which inferred the enhancement in strength and instability of thermocapillary convection with Ma. On the theta = 0 degrees plane of the liquid bridge, the low concentration of oxygen displays a 'dumbbell shape' at the center. On the z/L = 0.5 plane of the liquid bridge, the oxygen concentration appears an inhomogeneous 'star shape' distribution. Moreover, the concentration and radial segregation effect of oxygen increase with the increment of Ma in floating zone. (C) 2017 Elsevier Masson SAS. All rights reserved.

Indexed by:Journal paper

Discipline:Engineering

First-Level Discipline:Power Engineering and Engineering Thermal Physics

Document Type:J

ISSN No.:1290-0729

Translation or Not:no

Date of Publication:2017-08-01

Co-author:zhuguiping,张银

Correspondence Author:hhl

Date of Publication:2017-08-01