This article presents significant experimental data about the coaxial dual-pipe heat pipe which is invented by our CCT laboratory. The coaxial dual-pipe heat pipe is built-in an inner pipe in the adiabatic section of a common heat pipe. A common heat pipe is composed of three sections: the evaporator section at the one end; the condenser section at the other end; and the adiabatic section in between. The vapor and the liquid phases of the working fluid flow in opposite directions through the core and the wick, respectively. This special heat transfer behavior causes a common heat pipe to yield the discrete heat transfer property. In process, the vapor directly brings large amounts of heat from heat source and rapidly flows through the adiabatic section to the condenser section. This intelligent heat transfer technique lets the heat pipe yield extremely large thermal conductivity. Unfortunately, a heat pipe integrated with cooling fin in the adiabatic section has changed its original heat transfer property. The integrated cooling fin in the adiabatic section has in advance taken heat of the vapor away and caused the vapor to be condensed in the adiabatic section. Therefore, the vapor cannot reach the condenser section and the condenser section hence loses its cooling capability. In other words, the effective cooling length of a common heat pipe which is integrated with cooling fin in the adiabatic section is shortened. The coaxial dual-pipe heat pipe is built-in an inner pipe in the adiabatic section of a common heat pipe to avoid heat of the vapor to be earlier taken away and even condensed in the adiabatic section. Experimental study in this work first built a home-made square coaxial dual-pipe heat pipe integrated with outside isothermal cycling cooling water as the coaxial dual-pipe heat pipe cooler. The home-made square coaxial dual-pipe heat pipe has an observation window. It is convenient to observe change of the two-phase flow inside the heat pipe influenced by the outside cooling water. The results show that the new developed coaxial dual-pipe heat pipe cooler has kept the original heat transfer property of the bare heat pipe. The vapor has reached the condenser section.
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e-mail: chchting@ntut.edu.tw
e-mail: t8669030@ntut.edu.tw
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September 2011
This article was originally published in
Journal of Heat Transfer
Research Papers
Developing the Coaxial Dual-Pipe Heat Pipe for Applications on Heat Pipe Cooler
Chen-Ching Ting,
Chen-Ching Ting
Department of Mechanical Engineering,
e-mail: chchting@ntut.edu.tw
National Taipei University of Technology
, Taipei, 10608 Taiwan
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Chien-Chih Chen
e-mail: t8669030@ntut.edu.tw
Chien-Chih Chen
Institute of Mechanical and Electrical Engineering, National Taipei University of Technology
, Taipei, 10608 Taiwan
Search for other works by this author on:
Chen-Ching Ting
Department of Mechanical Engineering,
National Taipei University of Technology
, Taipei, 10608 Taiwan
e-mail: chchting@ntut.edu.tw
Chien-Chih Chen
Institute of Mechanical and Electrical Engineering, National Taipei University of Technology
, Taipei, 10608 Taiwan
e-mail: t8669030@ntut.edu.tw
J. Heat Transfer. Sep 2011, 133(9): 092901 (7 pages)
Published Online: August 1, 2011
Article history
Received:
October 18, 2010
Revised:
March 29, 2011
Accepted:
March 30, 2011
Published:
August 1, 2011
Citation
Ting, C., and Chen, C. (August 1, 2011). "Developing the Coaxial Dual-Pipe Heat Pipe for Applications on Heat Pipe Cooler." ASME. J. Heat Transfer. September 2011; 133(9): 092901. https://doi.org/10.1115/1.4003904
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