Investigation of liquid-gas interfacial shapes in reduced gravitational environments

An Shik Yang

doi:10.1016/j.ijmecsci.2008.05.003

Investigation of liquid-gas interfacial shapes in reduced gravitational environments

An Shik Yang

Department of Energy and Refrigerating Air-Conditioning Engineering

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

The objective of this study was to investigate the liquid-gas interfacial shapes in a low-gravity environment. Experimentally, a free-falling test setup was established to perform drop tests for observing interfacial flow phenomena under reduced-gravity conditions. In the theoretical analysis, the complex two-phase flowfield was simulated by using the transient three-dimensional conservation equations of mass and momentum. The continuous surface force (CSF) model was adopted to treat the surface-tension effect at the liquid-gas boundary. The volume-of-fluid (VOF) method, together with the piecewise linear interface construction (PLIC) technique, was used to describe the liquid-gas interface movements. The predictions were compared with the photographed images of the water-air interface shapes to validate the present computer code. To extend the application to the internal flow study of a ROCSAT-2 propellant tank, 16 numerical experiments were conducted to examine various effects, including liquid-filled ratio, gravity level, surface tension, and contact angle on the equilibrium shape of the pressurized helium gas bubble and the location of the center of mass (CoM).

Original language	English
Pages (from-to)	1304-1315
Number of pages	12
Journal	International Journal of Mechanical Sciences
Volume	50
Issue number	8
DOIs	https://doi.org/10.1016/j.ijmecsci.2008.05.003
State	Published - Aug 2008

Bibliographical note

Funding Information:
This study represents part of the results obtained under Contract NSC94-2212-E-212-009, sponsored by the National Science Council, Taiwan, Republic of China. The assistance of Mr. J.H. Wu in conducting the free-falling experiments is greatly appreciated. The author is very grateful to Mr. S.C. Huang and Mr. C.F. Chen for their help in performing numerical calculations. The author acknowledges Dr. T.C. Kuo of the National Space Organization for his valuable discussions and suggestions throughout this research project. The author also expresses appreciation to Dr. Cheryl Rutledge for her editorial assistance.

Keywords

Liquid-gas interface, reduced gravity
Surface tension

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10.1016/j.ijmecsci.2008.05.003

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title = "Investigation of liquid-gas interfacial shapes in reduced gravitational environments",

abstract = "The objective of this study was to investigate the liquid-gas interfacial shapes in a low-gravity environment. Experimentally, a free-falling test setup was established to perform drop tests for observing interfacial flow phenomena under reduced-gravity conditions. In the theoretical analysis, the complex two-phase flowfield was simulated by using the transient three-dimensional conservation equations of mass and momentum. The continuous surface force (CSF) model was adopted to treat the surface-tension effect at the liquid-gas boundary. The volume-of-fluid (VOF) method, together with the piecewise linear interface construction (PLIC) technique, was used to describe the liquid-gas interface movements. The predictions were compared with the photographed images of the water-air interface shapes to validate the present computer code. To extend the application to the internal flow study of a ROCSAT-2 propellant tank, 16 numerical experiments were conducted to examine various effects, including liquid-filled ratio, gravity level, surface tension, and contact angle on the equilibrium shape of the pressurized helium gas bubble and the location of the center of mass (CoM).",

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N2 - The objective of this study was to investigate the liquid-gas interfacial shapes in a low-gravity environment. Experimentally, a free-falling test setup was established to perform drop tests for observing interfacial flow phenomena under reduced-gravity conditions. In the theoretical analysis, the complex two-phase flowfield was simulated by using the transient three-dimensional conservation equations of mass and momentum. The continuous surface force (CSF) model was adopted to treat the surface-tension effect at the liquid-gas boundary. The volume-of-fluid (VOF) method, together with the piecewise linear interface construction (PLIC) technique, was used to describe the liquid-gas interface movements. The predictions were compared with the photographed images of the water-air interface shapes to validate the present computer code. To extend the application to the internal flow study of a ROCSAT-2 propellant tank, 16 numerical experiments were conducted to examine various effects, including liquid-filled ratio, gravity level, surface tension, and contact angle on the equilibrium shape of the pressurized helium gas bubble and the location of the center of mass (CoM).

AB - The objective of this study was to investigate the liquid-gas interfacial shapes in a low-gravity environment. Experimentally, a free-falling test setup was established to perform drop tests for observing interfacial flow phenomena under reduced-gravity conditions. In the theoretical analysis, the complex two-phase flowfield was simulated by using the transient three-dimensional conservation equations of mass and momentum. The continuous surface force (CSF) model was adopted to treat the surface-tension effect at the liquid-gas boundary. The volume-of-fluid (VOF) method, together with the piecewise linear interface construction (PLIC) technique, was used to describe the liquid-gas interface movements. The predictions were compared with the photographed images of the water-air interface shapes to validate the present computer code. To extend the application to the internal flow study of a ROCSAT-2 propellant tank, 16 numerical experiments were conducted to examine various effects, including liquid-filled ratio, gravity level, surface tension, and contact angle on the equilibrium shape of the pressurized helium gas bubble and the location of the center of mass (CoM).

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Investigation of liquid-gas interfacial shapes in reduced gravitational environments

Abstract

Bibliographical note

Keywords

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