[Table of Contents]

Plasma and Fusion Research

Volume 7, 2405073 (2012)

Regular Articles

Discussion of Heat Transfer to Liquid Helium on Surface Orientation Dependence
Akifumi IWAMOTO
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
(Received 12 December 2011 / Accepted 21 March 2012 / Published 26 July 2012)

Abstract

The surface orientation dependence of heat transfer characteristics in liquid helium was discussed based on previous studies. Judging from their discussions and experimental data, the critical heat fluxes of our measurements come from the upper limit of the heat flux in the regime of continuous vapor columns and patches. To compensate the surface orientation dependence, we modified the gravitational force term in a theoretical equation for the critical heat flux with a horizontal surface. Then, the evaluations by the modified equation were compared with our experimental results. Film boiling heat transfer coefficient with the variation of surface orientation was also discussed based on two-phase boundary layer treatment of free convection film boiling. It was confirmed that our experiments were consistent with the theory.

Keywords

LHe heat transfer, surface orientation dependence, polished copper surface, critical heat flux, film boiling heat transfer coefficient

DOI: 10.1585/pfr.7.2405073

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This paper may be cited as follows:

Akifumi IWAMOTO, Plasma Fusion Res. 7, 2405073 (2012).