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
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 , a dimensionless driving force number , 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 and a dimensionless driving time number 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.
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