The temporal evolution of a spherically shaped bubble sitting to one side of a dewar, initially at rest and subsequently spun up to rotating speed, is investigated. It shows a time-dependent deformation, elongation and finally a completion of bubble wrapping around the inner wall of the rotating dewar. Similarity considerations of how to promote the possibility of bubble wrapping processes in the rotating container are proposed. Examples are given to illustrate how to choose a combination of one, two or three parameters as a group with the rest of the parameters unchanged to promote a completion of the bubble wrapping process; and study the characteristics of bubble deformation during spin-up motion in the spacecraft operation for the purpose of designing instrumentation to carry out a space experiment. The time required for a completion of the bubble encirclement around the rotating dewar wall has been checked with the estimated time required for the spin-up motion to attain a new steady state based on Ekman layer computation. With the inclusion of the capillary effect, it has also been shown that the configuration of the rotating bubble is a function of density, surface tension, angular velocity and contact angle rather than a combination of density and angular velocity alone. The knowledge and skill of the present study can be useful for bubble oscillations associated with sloshing dynamics in rotating fluids.


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    Title :

    Dynamical behaviour of cryogenic helium in a partially filled dewar in microgravity


    Additional title:

    Das dynamische Verhalten von kälteerzeugendem Helium in einem partiell gefüllten Dewar-Gefäß unter Mikrogravitätsbedingungen


    Contributors:
    Hung, R.J. (author) / Pan, H.L. (author)


    Publication date :

    1996


    Size :

    10 Seiten, 7 Bilder, 34 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English







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