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Observation of torque exerted by pure superflow

Koehler, Thomas R. and Pellam, John R. (1962) Observation of torque exerted by pure superflow. Physical Review, 125 (3). pp. 791-794. ISSN 0031-899X. doi:10.1103/PhysRev.125.791.

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Pure superflow is observed to exert a torque in flowing about an object of arbitrary shape. The magnitude of such torque agrees in every respect with expectations based on pure potential flow theory. The present results indicating pure potential flow for superfluid are considered to constitute the complementary experiment to the earlier Craig-Pellam investigation of zero lift for superflow. We consider that these two experiments taken together establish completely the pure potential flow property for superfluid by verifying that (a) zero force, but (b) a prescribed torque are exerted upon an object of arbitrary shape and orientation. As a by-product to the present investigation, an independent evaluation of ρs/ρ for liquid helium is obtained in conformity with earlier measurements.

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Additional Information:©1962 The American Physical Society. Received 27 September 1961. Preliminary versions of this research have been reported at meetings: T.R. Koehler and J.R. Pellam, Bull. Am. Phys. Soc. 4, 370 (1959); T.R. Koehler and J.R. Pellman, Proceedings of the Seventh International Conference on Low-Temperature Physics, 1960 (University of Toronto Press, Toronto, 1960), paper 19-2, p. 271. Supported in part by the Alfred P. Sloan Foundation, Inc. and the National Science Foundation. One of us (T.R.K.) was a Standard Oil Company of California Fellow, 1957-8. [T.R.K.] -- In partial fulfillment of the requirements of the degree of Doctor of Philosophy.
Issue or Number:3
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6380
Deposited By: Tony Diaz
Deposited On:06 Dec 2006
Last Modified:08 Nov 2021 20:33

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