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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.2015013444
pages 77-90

EXPERIMENTAL STUDY OF ELECTRON BEAM IRRADIATION ON AN OSCILLATING HEAT PIPE

Naoko Iwata
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara-shi, Kanagawa, Kanagawa, 252-5210, Japan
Hiroyuki Ogawa
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara-shi, Kanagawa, Kanagawa, 252-5210, Japan
Yoshiro Miyazaki
Fukui University of Technology, 3-6-1, Gakuen, Fukui-shi, Fukui, 910-8505, Japan
Seisuke Fukuda
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara-shi, Kanagawa, Kanagawa, 252-5210, Japan

ABSTRACT

The effect of electron beam irradiation on the performance of an oscillating heat pipe (OHP), resulting from the transformation or decomposition of the working fluid 1,1,1,2-tetrafluoroethane (HFC-134a), was studied for a next-generation cubic micro-satellite composed of OHP panels. The OHP, containing 70 wt.% HFC-134a, was irradiated with 100 krad gamma rays. The OHP operated normally as a fixed-conductance OHP. There was little difference in the thermal conductance and maximum heat transfer rate before and after irradiation. The composition of the HFC-134a working fluid was analyzed by chromatography after irradiation to determine the impurities. The composition of the irradiated fluid was compared with that of the non-irradiated fluid, and four hydrochlorofluorocarbons (HCFCs) assumed to be decomposition products were detected at levels of several parts per million. Therefore, OHP performance was not degraded by 100 krad radiation.


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