Abstract
THE superfluidity of liquid helium II can be very conveniently studied by making observations on the flow of the thick mobile films (‘Rollin films'1) which cover all surfaces in contact with the liquid. In previous investigations of these films by Daunt and Mendelssohn2, the rate of flow was observed to be almost independent of such factors as the pressure head or the height of the film, and varied only with the temperature, rising from zero at the λ-point to 7·5 × 10-5 cm.3/sec. per cm. width of film below 1·5° K. We have extended these investigations and have observed : (a) that with some experimental arrangements the rate of flow varies considerably with the height of the film ; (b) that there is an effect which simulates a dependence upon the pressure head ; and (c) that much higher rates of flow, up to 103 cm.3/sec./cm., can occur.
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References
Rollin, B. V., Actes du 7e Cong., intern, du Froid. La Haye—Amsterdam, 1, 187 (1939).
Daunt, J. G., and Mendelssohn, K., Proc. Roy. Soc., A, 170, 423, 439 (1939).
Bijl, A., de Boer, J., and Michels, A., Physica, 8, 655 (1941).
Daunt, J. G., and Mendelssohn, K., Nature, 143, 719 (1939).
London, H., Proc. Roy. Soc., A, 171, 484 (1939).
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ATKINS, K. Transfer Rates in Liquid Helium Films. Nature 161, 925–927 (1948). https://doi.org/10.1038/161925b0
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DOI: https://doi.org/10.1038/161925b0
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