Study on the Lateral Sloshing Behavior under Microgravity Condition Targeted for a Propellant Tank

DOI:10.15011//jasma.36.360403
Int. J. Microgravity Sci. Appl. 2019p360403
Author
M. MICHIHARA and R. IMAI
Organization
Unit of Aerospace System Engineering, Graduate school of Muroran Institute of Technology
Abstract
Fluid behavior in microgravity (μg) is different from in ground gravity since surface tension and wetting are dominant in μg conditions. In propellant tanks for artificial satellites and future on-orbit spacecraft, sloshing due to disturbance and settling behavior from changes in acceleration have to be understood for the design of the propellant supply system and attitude control system. In this paper, we observed sloshing behaviors in cylindrical containers in μg conditions created by a drop tower facility. In order to investigate the effects of the contact line velocity on dynamic contact angle, we measured dynamic contact angle using a capillary tube. CFD analysis introducing Cox’s equation in consideration of capillary experimental results were also conducted and these results were compared with μg experimental results. Regarding the experimental results, the diameter of the test tank, excitation acceleration, and kinematic viscosity were found to have a significant effect on sloshing behavior in a μg condition. Regarding the comparison between the CFD analysis results and the experimental results, there was a slight difference in the wave shape and the time required for the liquid to reach the top of the test tank. Conversely, there was a qualitative agreement between the fluctuation period and the approximate shape of the liquid surface over time.
Keyword(s)
Microgravity, Propellant tank, Sloshing, CFD, Contact angle
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Received 30 July 2019, accepted 23 October 2019, published 31 October 2019

© The Japan Society of Microgravity Applicaiton

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