We tested a thermosyphon loop with water as the working fluid using heating rates between 100 W and 400 W. Four kinds of core blocks were installed in the evaporator and tested: a hollow block, and blocks with narrow holes: Φ 2.2 mm × 90; Φ 2.5 mm × 55; and Φ 4.0 mm × 30. The temperature distribution indicated stable flow circulation inside the thermosyphon at low volume ratios but was unstable when the volume ratio was increased higher than 30%. The characteristics of the flow pattern are summarized as a flow map showing the heating rate versus the volume ratio. The recovered heat and the thermal resistance of the thermosyphon loop were clearly improved by using the core blocks with narrow holes instead of hollow blocks for the treated volume ratios from 20% to 80%. The thermal resistance increased when the volume ratio reached high values, suggesting that the effects from the abnormality of the flow circulation affected thermal resistance. The velocity of the gas stream in the thermosyphon was estimated by assuming an isothermal state, and it is diagrammed showing the heating rate at different temperatures. The current experiment of the thermosyphon loop is plotted in this diagram, which indicates the need for a wide margin due to the limitations of the sonic velocity and the pressure head at the full height of the heat pipe.
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December 2014
Research-Article
Experiments on Thermosyphon Loops for Low-Temperature Waste-Heat Recovery
Koji Matsubara,
Koji Matsubara
1
Department of Mechanical and
Production Engineering,
e-mail: matsu@eng.niigata-u.ac.jp
Production Engineering,
Niigata University
,Ikarashi 2-nocho 8050
,Niigata 950-2181
, Japan
e-mail: matsu@eng.niigata-u.ac.jp
1Corresponding author.
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Suguru Tachikawa,
Suguru Tachikawa
Department of Mechanical and
Production Engineering,
Production Engineering,
Niigata University
,Ikarashi 2-nocho 8050
,Niigata 950-2181
, Japan
Search for other works by this author on:
Itaru Kourakata,
Itaru Kourakata
Institute for Research
Collaboration and Promotion,
Collaboration and Promotion,
Niigata University
,Ikarashi 2-nocho 8050
,Niigata 950-2181
, Japan
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Yusaku Matsudaira
Yusaku Matsudaira
Department of Mechanical and
Production Engineering,
Production Engineering,
Niigata University
,Ikarashi 2-nocho 8050
,Niigata 950-2181
, Japan
Search for other works by this author on:
Koji Matsubara
Department of Mechanical and
Production Engineering,
e-mail: matsu@eng.niigata-u.ac.jp
Production Engineering,
Niigata University
,Ikarashi 2-nocho 8050
,Niigata 950-2181
, Japan
e-mail: matsu@eng.niigata-u.ac.jp
Suguru Tachikawa
Department of Mechanical and
Production Engineering,
Production Engineering,
Niigata University
,Ikarashi 2-nocho 8050
,Niigata 950-2181
, Japan
Itaru Kourakata
Institute for Research
Collaboration and Promotion,
Collaboration and Promotion,
Niigata University
,Ikarashi 2-nocho 8050
,Niigata 950-2181
, Japan
Yusaku Matsudaira
Department of Mechanical and
Production Engineering,
Production Engineering,
Niigata University
,Ikarashi 2-nocho 8050
,Niigata 950-2181
, Japan
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received October 1, 2013; final manuscript received April 2, 2014; published online May 9, 2014. Assoc. Editor: Hongbin Ma.
J. Thermal Sci. Eng. Appl. Dec 2014, 6(4): 041006 (8 pages)
Published Online: May 9, 2014
Article history
Received:
October 1, 2013
Revision Received:
April 2, 2014
Citation
Matsubara, K., Tachikawa, S., Kourakata, I., and Matsudaira, Y. (May 9, 2014). "Experiments on Thermosyphon Loops for Low-Temperature Waste-Heat Recovery." ASME. J. Thermal Sci. Eng. Appl. December 2014; 6(4): 041006. https://doi.org/10.1115/1.4027417
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