Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimer: 1065-3090
ISSN En ligne: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2018021253
pages 47-64

IMAGE ANALYSIS OF INTERNAL FLOW IN GROOVED-CHANNEL HEAT TRANSPORT DEVICE WITH PHASE CHANGE

Kazusa Abiko
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
Akira Murata
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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

RÉSUMÉ

Recent advancement in the design of electronic devices necessitates effective cooling methods due to their high performance, small size, and high-density packaging. As compared with conventional heat pipes, Oscillating Heat Pipe (OHP) and Parallel-Tube Heat transport device (PTH) show higher heat-transport efficiency because of spontaneous internal flow convecting both sensible and latent heats. OHP consists of a meandering tube, whereas PTH consists of multiple tubes and two headers. When a certain level of temperature difference is applied between both ends, self-oscillating flow of liquid and vapor with phase change occurs in the OHP/PTH. So far many studies have been performed for OHP and some for PTH. However, the relation between the two-phase internal flow pattern and heat transport rate has not been quantitatively clarified as yet. In this study, in order to highlight the difference between OHP and PTH, simultaneous measurements of heat transport rate and internal flow pattern were performed for them with two working fluids (ethanol and FC-72). In the present results, when the heat transport rate was increased, the amplitude of the oscillating flow was increased so as for the internal flow from the bottom heating section to reach the top cooling section. At the highest heat transport rate, unidirectional flow component with some oscillating flow resulted in fixed upward/downward flows in each straight section except for the case of PTH with ethanol. The higher degree of freedom forthe internal flow caused by the headers of PTH resulted in the higher performance in PTH than in OHP.


Articles with similar content:

INTERNAL FLOW PATTERN AND HEAT TRANSPORT PERFORMANCE OF AN OSCILLATING HEAT PIPE WITH GROOVED CHANNELS
Journal of Flow Visualization and Image Processing, Vol.22, 2015, issue 1-3
Kazusa Abiko, Akira Murata, Kaoru Iwamoto, Hiroshi Saito
Effects of Tube Diameter on Internal Flow Patterns and Heat Transport Performance of Parallel-Tube Heat Transport Device
International Heat Transfer Conference 15, Vol.22, 2014, issue
Kazusa Abiko, Akira Murata, Kaoru Iwamoto, Hiroshi Saito
Thermal performance of SEMOS heat pipes
International Heat Transfer Conference 12, Vol.54, 2002, issue
Shirojh Baba, Shinichi Nagata , Ryo Shirakashi, Shigefumi Nishio
VISUALIZED STUDY OF THE GRAVITATIONAL EFFECT IN A LOOP HEAT PIPE WITH TWO EVAPORATORS AND ONE CONDENSER
International Heat Transfer Conference 16, Vol.13, 2018, issue
Hosei Nagano, N. Watanabe, Xinyu Chang
EXPERIMENTAL INVESTIGATION OF A SINGLE CLOSED LOOP PULSATING HEAT PIPE
Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), Vol.0, 2017, issue
P. Srikrishna, Dr SUM Reddy, A R Hari Kumar, G.S.V.L. Narasimham