Hydraulic characteristics of long nitrogen cooling channels

Author

Fuchino, S. ; Furuse, M. ; Higuche, N. ; Okano, M. ; Agatsuma, K.

Author_Institution

National Inst. of Adv. Ind. Sci. & Technol., Ibaraki, Japan

Volume

14

Issue

2

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

1754

Lastpage

1757

Abstract

We have developed two types of long cooling channels to study the hydraulic characteristics of superconducting power cables. At first, we have conducted cooling tests of a 100 m-long duplex-counter-flow channel with liquid nitrogen and observed two kinds of flow instabilities. One is the density wave oscillation and the other is the Ledinegg instability. Secondly we have conducted cooling tests of a 500 m-long channel with three dummy cores simulating superconductors and obtained basic data of initial cooling and temperature distributions along the channel. Oscillation conditions have been checked according to the Ledinegg instability.

Keywords

channel flow; cooling; flow instability; power cables; superconducting cables; temperature distribution; Ledinegg instability; cooling tests; density wave oscillation; duplex-counter-flow channel; flow instabilities; hydraulic characteristics; initial cooling; liquid nitrogen; long nitrogen cooling channels; oscillation conditions; pressure drops; superconducting power cables; temperature distributions; Circuits; Cooling; Fluid flow; Nitrogen; Power cables; Resistance heating; Superconducting cables; Superconductivity; Temperature distribution; Testing; Flow instability; initial cooling; pressure drops; superconducting power cables;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2004.831069

Filename

1325146