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Heat Pipe Science and Technology, An International Journal

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

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v2.i1-4.160
pages 161-172

VISUALIZATION OF A LOOP HEAT PIPE USING NEUTRON RADIOGRAPHY

Atsushi Okamoto
Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki, 305-8505, Japan
Ryuta Hatakenaka
Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki, 305-8505, Japan
Masahide Murakami
University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8571, Japan

ABSTRACT

It has recently become difficult to meet the increasing thermal control requirement of spacecraft with existing thermal control devices. A loop heat pipe (LHP) is an effective method to satisfy the requirement. JAXA has been developing a small LHP for space application. As part of the development and to better understand LHP operation, visualization of the working fluid using neutron radiography was conducted. As a result, much significant information, such as the behavior of the liquid at startup and dryout behavior in the primary wick, was observed. This information contributes greatly to the improvement of LHP design and the establishment of a numerical simulation model.