Optimization and temperature distribution of a current lead for a cryogenic device

A method of optimizing the cross-sectional area of a cooled current lead is described in this paper. First, the dependence of the gas flow rate on the cross-sectional area is derived from the heat balance equations. Then, two curves are acquired, one relating to the optimum area, and the other to th...

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Bibliographic Details
Published in:Cryogenics (Guildford) 1983-01, Vol.23 (9), p.501-507
Main Author: Nan, H.L.
Format: Article
Language:English
Subjects:
Applied sciences
cryogenics
current distribution
current lead
Electrical engineering. Electrical power engineering
Electromagnets
Exact sciences and technology
optimization
Various equipment and components
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Summary:A method of optimizing the cross-sectional area of a cooled current lead is described in this paper. First, the dependence of the gas flow rate on the cross-sectional area is derived from the heat balance equations. Then, two curves are acquired, one relating to the optimum area, and the other to the corresponding temperature gradient at the cold end. The product of the utilization coefficient of the coldness together with the temperature difference is the independent variable of the functions represented by the two curves, from which the graphic changes of the minimum gas flow rate under various situations would be noted. Also mentioned here is the choice of the optimum material. On the basis of the result of the calculation given above, curves of one-dimensional temperature distribution of a lead under different conditions could be drawn up. Lastly, the designing principle of a lead with non-constant cross-sectional area is discussed.
ISSN:0011-2275
1879-2235
DOI:10.1016/0011-2275(83)90012-7