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Dynamical Behaviour of Cryogenic Helium in a Partially Filled Dewar in Microgravity

The temporal evolution of a spherically shaped bubble sitting to one side of a dewar at rest initially, and subsequently spun up to a constant angular velocity, is investigated. The time-dependent deformation of the bubble, which starts to elongate from a spherical shape, to wrap around the inner dewar wall, and finally to complete encirclement of the dewar wall, is numerically studied and simulated. Some similarity parameters are considered to study the bubble wrapping around the dewar wall. Examples are given to illustrate this problem which is important in the understanding of how surface tension, rotation speed, fluid density, contact angle, etc. affect the bubble deformation for the case of cryogenic helium II in a microgravity environment.