Thermocapillary flow and free-surface deformation of liquid bridge under different magnetic fields

Affiliation of Author(s):航天学院

Journal:APPLIED THERMAL ENGINEERING

Key Words:Thermocapillary flow Deformable free-surface VOF Magnetic field Deformation damping

Abstract:The effects of transverse and cusp magnetic fields have been conducted on the thermocapillary flow and freesurface deformation in a silicon liquid bridge. The volume of fluid (VOF) method is adopted to track the freesurface movement. Based on our numerical results, both the transverse and cusp magnetic fields have a remarkable suppressing effect on the thermocapillary flow and free-surface deformation. The suppressing effect is directional in the case of the transverse magnetic field. At theta= 0 degrees plane, the transverse magnetic field evidently suppresses the surface deformation near z = 0.225 cm region when B-To <= 0.1 T and starts to have the suppression effect near z = 0.921 cm region when 0.1 T < B-T0 <= 0.3 T. The deformation suppression performances at theta = 90 degrees plane are opposite to that at theta = 0 degrees plane. The critical Hartmann numbers for deformation damping on the theta = 0 degrees and theta = 90 degrees planes are 230.12 and 240.22, respectively. The cusp magnetic field causes concentration of the convection vortexes near the interface. Deformation suppression capability of cusp magnetic field is stronger than that of the transverse magnetic field. The critical Hartmann numbers for deformation damping on the theta = 0 degrees and theta = 90 degrees planes have the same value of 98.36 under the cusp magnetic field.

Indexed by:Journal paper

Document Type:J

ISSN No.:1359-4311

Translation or Not:no

Date of Publication:2018-05-05

Co-author:张银,zhuguiping

Correspondence Author:hhl

Date of Publication:2018-05-05