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research-article

Influence of ambient airflow on free surface deformation and flow pattern inside liquid bridge with large Prandtl number fluid (Pr>100) under gravity

[+] Author and Article Information
Shuo Yang

Key Laboratory of National Education Ministry for Electromagnetic Process of Materials, Northeastern University, Shenyang, 110819, ChinaSchool of Ocean, Yantai University, Yantai, 264005, China
ys_yang_shuo@163.com

Ruquan Liang

Key Laboratory of National Education Ministry for Electromagnetic Process of Materials, Northeastern University, Shenyang, 110819, ChinaSchool of Mechanical and Vehicle Engineering, Linyi University, Linyi, 276005, China
49784322@163.com

Song Xiao

School of Mechanical and Vehicle Engineering, Linyi University, Linyi, 276005, China
15842246950@163.com

Jicheng He

Key Laboratory of National Education Ministry for Electromagnetic Process of Materials, Northeastern University, Shenyang, 110819, China
812886674@qq.com

Shuo Zhang

Key Laboratory of National Education Ministry for Electromagnetic Process of Materials, Northeastern University, Shenyang, 110819, China
747293379@qq.com

1Corresponding author.

ASME doi:10.1115/1.4036871 History: Received September 07, 2016; Revised May 17, 2017

Abstract

The influence of shear airflow on the free surface deformation and the flow structure for large Prandtl number fluid (Pr=111.67) has been analyzed numerically as the parallel airflow is induced into the surrounding of liquid bridge from the lower disk or the upper disk. Against the former studies, an improved level set method is adopted to track any tiny deformation of free surface, where the area compensation is carried out to compensate the non-conservation of mass. Present results indicate that the airflow can excite flow cells in the isothermal liquid bridge. The airflow induced from the upper disk impulses the convex region of free interface as the airflow intensity is increased, which may exceed the breaking limit of liquid bridge. The free surface is transformed from the "S"-shape into the "M"-shape as the airflow is induced from the lower disk. For the non-isothermal liquid bridge, the flow cell is dominated by the thermocapillary convection at the hot corner if the airflow comes from the hot disk, and another reversed cell flow near the cold disk appears. While the shape of free surface depends on the competition between the thermocapillary force and the shear force when the airflow is induced from the cold disk.

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