Heat transfer characteristics of the supercritical helium in a cable-in-conduit conductor

Author

Wachi, Y. ; Ono, M. ; Hamajima, T.

Author_Institution

Toshiba Corp., Yokohama, Japan

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

568

Lastpage

571

Abstract

To study the thermal stability of a forced-cooled superconducting coil with a cable-in-conduit conductor (CICC), it is important to measure the steady-state heat transfer characteristics of the supercritical helium in the narrow channel like a CICC at various conditions. The measured heat transfer coefficient is compared with one calculated by the Giarratano correlation and other studies. The results obtained show that measured values for turbulent flow scatter widely and the values for laminar flow are 1.5-1.8 times larger than those calculated from Nu=4.36. The stability of a CICC is discussed with the relation between the Stekly´s stability limit and the measured heat transfer coefficient.<>

Keywords

electric conduits; heat transfer; laminar flow; pipe flow; power cable testing; power cables; superconducting cables; turbulence; Giarratano correlation; Stekly´s stability limit; cable-in-conduit conductor; forced-cooled superconducting coil; heat transfer coefficient; laminar flow; steady-state heat transfer characteristics; supercritical helium; thermal stability; turbulent flow; Conductors; Force measurement; Heat transfer; Helium; Steady-state; Superconducting cables; Superconducting coils; Thermal conductivity; Thermal force; Thermal stability;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402614

Filename

402614