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On-line Access: 2023-12-29

Received: 2023-01-03

Revision Accepted: 2023-06-08

Crosschecked: 2024-01-04

Cited: 0

Clicked: 477

Citations:  Bibtex RefMan EndNote GB/T7714


Yaping ZHANG


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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.12 P.1131-1139


Dynamics of buoyancy-driven microflow in a narrow annular space

Author(s):  Yanzhong WANG, Yaping ZHANG, Kai YANG, Boji LU, Hao GAO

Affiliation(s):  School of Mechanical Engineering & Automation, Beihang University, Beijing 100191, China; more

Corresponding email(s):   hellozyp5200@qq.com

Key Words:  Liquid floated gyroscope (LFG), Annular channel, Roughness feature, Fluid drag

Yanzhong WANG, Yaping ZHANG, Kai YANG, Boji LU, Hao GAO. Dynamics of buoyancy-driven microflow in a narrow annular space[J]. Journal of Zhejiang University Science A, 2023, 24(12): 1131-1139.

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%T Dynamics of buoyancy-driven microflow in a narrow annular space
%A Yanzhong WANG
%A Yaping ZHANG
%A Boji LU
%A Hao GAO
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200617

T1 - Dynamics of buoyancy-driven microflow in a narrow annular space
A1 - Yanzhong WANG
A1 - Yaping ZHANG
A1 - Kai YANG
A1 - Boji LU
A1 - Hao GAO
J0 - Journal of Zhejiang University Science A
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2200617

This paper aims to investigate the dynamics of buoyancy-driven microflow in a narrow annular space inside a liquid floated gyroscope (LFG). Several theoretical models with a non-uniform thermal boundary for fluid flow in annular channels are given to analyze the effects of various parameters, such as the clearance size h, roughness height re, and rough density ε, on the flow and temperature profiles as well as on the fluid-drag torque. In the narrow annular regime, the relationship between the temperature and the angular displacement of the outer wall is defined as a cosine function, and the surface roughness of the inner wall is structured as a series of surface protrusions with a circular shape. With the increase of clearance size h, the flow velocity gradually increases to a stable level, and the drag torque increases initially and then decreases to a stable level. Furthermore, the increase of roughness height re and roughness density ε intensifies the frictional effect of fluid on the inner-wall surface. However, these two parameters have no significant effect on the flow velocity. This study can provide theoretical references for precision manufacturing and precision improvement of gyro instruments.




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