Effect of orifice location on heat transfer in a duct filled with pressurized He II

Author

Konishi, Soujirou ; Fujita, Kenji ; Okamura, Takahiro ; Shirai, Yasuyuki ; Shiotsu, Masahiro

Author_Institution

Dept. of Energy Sci. & Technol., Kyoto Univ., Japan

Volume

14

Issue

2

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

1762

Lastpage

1765

Abstract

Steady-state and transient heat transfer on a flat plate at one end of a rectangular duct with an orifice were measured in He II for bath temperatures of 1.8 K to 2.14 K at atmospheric pressure. The steady-state critical heat flux (CHF) was slightly affected by the orifice location. The transient heat transfer for a stepwise heat input with a magnitude larger than the CHF showed a quasi steady-state with a certain lifetime on the extrapolation of steady-state Kapitza conductance curve. The relation between the lifetime and step heat flux was significantly affected by the orifice location. Numerical analysis was performed for the steady-state and the transient heat transfer in the duct with the orifice by using the two-dimensional computer code named SUPER-2D based on the two-fluid model and the theory of mutual friction. The solutions of CHF and lifetime agreed well with the experimental data. The heat transport mechanism was clarified by the analysis.

Keywords

computational fluid dynamics; cryogenics; heat transfer; pipe flow; superconducting magnets; superfluid helium-4; two-phase flow; 1.8 to 2.14 K; 2D computer code; He; SUPER-2D; atmospheric pressure; bath temperatures; flat plate; heat transport mechanism; mutual friction; numerical analysis; orifice location effect; pressurized He II; rectangular duct; steady-state Kapitza conductance curve extrapolation; steady-state critical heat flux; steady-state heat transfer; transient heat transfer; two-fluid model; Atmospheric measurements; Ducts; Extrapolation; Heat transfer; Helium; Numerical analysis; Orifices; Pressure measurement; Steady-state; Temperature; He II; heat transfer; two-dimensional; two-fluid model;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2004.831071

Filename

1325148