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Small amplitude liquid oscillations in a rectangular container under zero-gravity

Published online by Cambridge University Press:  04 July 2016

H. F. Bauer  and
W. Eidel
H. F. Bauer
Affiliation:
Institut für Raumfahrttechnik, Universität der Bundeswehr, München, Neubiberg, FRG
W. Eidel
Affiliation:
Institut für Raumfahrttechnik, Universität der Bundeswehr, München, Neubiberg, FRG
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Abstract

Under zero-gravity conditions, the liquid surface in a container has a displaced equilibrium position due to surface tension effects; this depends upon the magnitude of the contact angle to the wall. Free and forced sloshing have been investigated for these conditions. It was found that the natural frequencies of the liquid increases with the contact angle to a maximum value at a contact angle slightly above π/2 and then decreases. This behaviour is not symmetrical within the wetting and non-wetting range. Thus, a completely non-wetting liquid has larger natural frequencies than a completely wetting liquid. It was also found that the sloshing mass of a wetting liquid is considerably larger under zero-gravity than under normal gravity conditions and that a non-wetting liquid exhibits substantially reduced sloshing mass, indicating that the influence of liquids with a small contact angle on the dynamics of a vehicle with liquid containers (with a free liquid surface) may be quite pronounced.

Type
Research Article
Information
The Aeronautical Journal , Volume 93 , Issue 930 , December 1989 , pp. 379 - 386
Copyright
Copyright © Royal Aeronautical Society 1989 

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