Numerical Simulation of Quasi-Static Bubble Formation from a Submerged Orifice by the Axisymmetric VOSET Method

In order to investigate the dynamics of quasi-static bubble formation from a submerged orifice, this paper developed an axisymmetric VOSET method with continuum surface force (CSF) model which can accurately capture the moving phase interface of gas-liquid flow. Test case shows that numerical result...

Full description

Saved in:
Bibliographic Details
Published in:Microgravity science and technology 2019-06, Vol.31 (3), p.279-292
Main Authors: Wang, Tai, Li, Hui-Xiong, Zhao, Jian-Fu, Guo, Kai-Kai
Format: Article
Language:English
Subjects:
Acceleration
Aerospace Technology and Astronautics
Bubbles
Classical and Continuum Physics
Computational fluid dynamics
Computer simulation
Contact angle
Density
Engineering
Flow rates
Flow velocity
Gas flow
Gravitation
Liquid flow
Mathematical models
Numerical simulations
Orifices
Original Article
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Surface tension
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In order to investigate the dynamics of quasi-static bubble formation from a submerged orifice, this paper developed an axisymmetric VOSET method with continuum surface force (CSF) model which can accurately capture the moving phase interface of gas-liquid flow. Test case shows that numerical results are in good agreement with experimental results from the literature. The effects of gas flow rate, orifice size, surface tension, contact angle, liquid density, and gravitational acceleration on bubble shape, departure time and departure volume are investigated and analyzed. It is found that increase in orifice size, surface tension, and contact angle results in the increase in the capillary force resisting bubble detachment, which leads to larger departure time and departure volume. But there is a critical contact angle, and contact angle has no significance effect on the process of bubble formation and detachment, when it is smaller than the critical value. Buoyancy force promoting bubble detachment increases with the increase of liquid density and gravitational acceleration, which results in smaller departure time and departure volume. Also, the forming process of the neck shape of bubble bottom at the bubble detachment stage is observed, and the results show that the position of the smallest part of the neck approximately equals to the orifice radius R c .
ISSN:0938-0108
1875-0494
DOI:10.1007/s12217-019-9690-5