Characterization of a capillary driven flow in microgravity by means of optical technique

Domenico Fiorini, Louis Carbonnelle, A. Simonini, J. Steelant, D. Seveno, M. A. Mendez
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引用次数: 1

Abstract

The motion of a gas-liquid interface along a solid wall is influenced by the capillary forces resulting from the interface's shape and its interaction with the solid, where it forms a dynamic contact angle. Capillary models play a significant role in the management of cryogenic propellants in space, where surface tension dominates the behaviour of gas-liquid interfaces. Yet, most empirical models have been derived in configurations dominated by viscous forces. In this study, we experimentally investigate the wetting of a low-viscosity, highly wetting fluid in a reduced gravity environment. Our setup consisted of a transparent and diverging U-tube in which capillary forces sustain the liquid motion. Combining Particle Image Velocimetry (PIV) and high-speed backlighting visualization, the experimental campaign allowed for measuring the interface evolution and the velocity field within the liquid under varying gravity levels. This work reports on the preliminary results from the image velocimetry and shows that the velocity profile within the tube is close to parabolic until a short distance from the interface. Nevertheless, classic 1D models for capillary rise face difficulties reproducing the interface dynamics, suggesting that the treatment of the surface tension in these problems must be reviewed.
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来源期刊
Multiphase Science and Technology
Multiphase Science and Technology Engineering-Engineering (all)
CiteScore
0.80
自引率
0.00%
发文量
15
期刊介绍: Two-phase flows commonly occur in nature and in a multitude of other settings. They are not only of academic interest but are found in a wide range of engineering applications, continuing to pose a challenge to many research scientists and industrial practitioners alike. Although many important advances have been made in the past, the efforts to understand fundamental behavior and mechanisms of two-phase flow are necessarily a continuing process. Volume 8 of Multiphase Science and Technology contains the text of the invited lectures given at the Third International Workshop on Two-Phase Flow Fundamentals sponsored by the Electric Power Research Institute (EPRI) and the U. S. Department of Energy (DOE).
期刊最新文献
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