International Journal of Rotating Machinery

International Journal of Rotating Machinery / 2003 / Article

Open Access

Volume 9 |Article ID 754854 | https://doi.org/10.1155/S1023621X03000411

Thomas C. Chuang, "Characteristics of Steady and Transient Superfluid Transport for the Cooling of Superconducting Rotating Machines", International Journal of Rotating Machinery, vol. 9, Article ID 754854, 10 pages, 2003. https://doi.org/10.1155/S1023621X03000411

Characteristics of Steady and Transient Superfluid Transport for the Cooling of Superconducting Rotating Machines

Abstract

The unique properties of superfluid helium (He II) make it a very efficient cooling agent for superconducting rotating machines. Steady and transient transport characteristics and design formulas for the cooling of superconducting windings are enumerated in this article. Several superfluid transport analytical models and useful design equations are discussed: laminar flow; turbulent flow; and pure superfluid flow under steady-state and transient conditions. An effort was made to consolidate all analytical models and experimental results into a common framework. Under conditions of steady He II transport, a dimensionless heat flux number Nq, a dimensionless driving force number NT, and a characteristic length where used so that a generalized equation could be derived to describe superfluid transport in any geometry. In the case of transient transport of He II, a dimensionless heat flux number Nq and a dimensionless driving time number Nt were used so that a generalized equation could be derived to describe transient superfluid transport in laminar flow and turbulent regimes. Many experimental data were compiled to substantiate the analysis.

Copyright © 2003 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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