Instabilities of thermocapillary-buoyancy flow in a rotating annular pool for medium-Prandtl-number fluid

Hao Liu; Jinchao He; Zhong Zeng; Zhouhua Qiu

doi:10.1103/PhysRevE.104.035101

Instabilities of thermocapillary-buoyancy flow in a rotating annular pool for medium-Prandtl-number fluid

Phys Rev E. 2021 Sep;104(3-2):035101. doi: 10.1103/PhysRevE.104.035101.

Authors

Hao Liu^{1

2}, Jinchao He^{1

2}, Zhong Zeng³, Zhouhua Qiu^{1

2}

Affiliations

¹ Chongqing Southwest Research Institute for Water Transport Engineering, Chongqing Jiaotong University, Chongqing 400016, China.
² Key Laboratory of Inland Waterway Regulation Engineering Ministry of Communications, Chongqing Jiaotong University, Chongqing 400074, China and Chongqing Xike Consulting Center for Water Transport Engineering, Chongqing 400016, China.
³ College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.

PMID: 34654135
DOI: 10.1103/PhysRevE.104.035101

Abstract

The instabilities of the steady axisymmetric thermocapillary-buoyancy flow in a rotating annular pool were investigated by linear stability analysis. The critical instability parameters for the thermocapillary-buoyancy flow (normal gravity) and the pure thermocapillary flow (microgravity) were compared under different pool depths and rotation rates. The results show that the thermocapillary-buoyancy flow is more stable than the pure thermocapillary flow due to the stabilizing effect of the gravity (buoyancy) force. Two types of oscillatory instabilities were observed depending on the different rotation rates, and the propagation direction of the hydrothermal wave is also affected by the rotation rate.