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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2015015685
pages 81-96

INTERNAL FLOW PATTERN AND HEAT TRANSPORT PERFORMANCE OF AN OSCILLATING HEAT PIPE WITH GROOVED CHANNELS

Kazusa Abiko
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
Akira Murata
Tokyo University of Agriculture and Technology
Hiroshi Saito
Mechanical Systems Engineering Course, Tokyo Metropolitan College of Industrial Technology, 1-10-40 Higashi-Ohi, Shinagawa, Tokyo 140-0011, Japan
Kaoru Iwamoto
Department of Mechanical Engineering, Tokyo University of Science, Noda-shi, Chiba 278-8510; Department of Mechanical System Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

ABSTRACT

An oscillating heat pipe (OHP) shows a high heat-transport efficiency because of the spontaneous internal flow convecting both sensible and latent heats. The OHP consists of a meandering tube that connects the heating and cooling sections. When a certain level of temperature difference between these sections is attained, self-oscillating flow of liquid and vapor with a phase change occurs and the OHP is activated to work. In order to reveal the heat transport mechanism and characteristics of the OHP, experimental and numerical studies have been performed. However, the relationship between the two-phase internal flow pattern and heat transport performance had not been clarified quantitatively as yet. In this study, simultaneous measurements of heat transport rate and internal flow pattern were performed in order to discuss the relationship between the internal flow pattern and the heat transport rate. Furthermore, the characteristic frequency and the number of interfaces of the internal flow were calculated from the results. In the present results, when the heat transport rate was increased, the amplitude of the oscillating flow was increased so that the internal flow from the bottom heating section can reach the top cooling section. At the highest heat transport rate, the intensified unidirectional flow component resulted in the fixed upward/ downward flows in each straight section. The characteristic frequency and the number of interfaces of the internal flow gave distinctive values depending on the fixed upward/downward flows in the straight sections.


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