Abstract
A preliminary analysis is made on the flow of nitrogen and helium vapours in the necks of rotating cryostats. Solutions for the velocity and temperature profiles are presented for fully developed flow with a uniform axial temperature gradient and are compared with experimental observations on flow in a rotating glass dewar. The flow of cold vapour is confined to an annular boundary layer with a thickness proportional to the fourth root of the rotational Rayleigh number, while a reverse flow of warm vapour is generated on the axis.
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