This paper presents an experimental study of heat transfer in a pool boiling evaporator with porous insert. Porous graphite foams were structured into cubic block and straight fin shapes and tested with FC-72 and HFE-7000 coolants with the objective of maximizing the heat transfer in a pool boiling configuration. A two-phase thermosyphon facility was developed to investigate the system’s performance using graphite foams of block and fin structures. The effects of foam configuration, working fluid type, and coolant filling volume on pool boiling heat transfer were analyzed. The results showed that the coolant filling volume has negligible effect on cooling performance. On the other hand, the thermosyphon performance is significantly affected by the coolant properties and the configuration of the porous graphite foam. A comparison of the Bond numbers obtained for FC-72 and HFE-7000 indicates that the bubbles have to overcome higher surface tension forces before departing the foam surface in HFE-7000. Meanwhile, the effect of the foam configuration on the boiling heat transfer performance implies that a properly designed geometry of the porous graphite foam will lead to significant enhancement of the evaporation process in a thermosyphon system.
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e-mail: mkcleong@ntu.edu.sg
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June 2011
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Experimental Study of a Two-Phase Thermosyphon With Porous Graphite Foam Insert
L. W. Jin,
L. W. Jin
School of Mechanical and Aerospace Engineering,
Nanyang Technological University
, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
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K. C. Leong,
K. C. Leong
School of Mechanical and Aerospace Engineering,
e-mail: mkcleong@ntu.edu.sg
Nanyang Technological University
, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
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I. Pranoto,
I. Pranoto
School of Mechanical and Aerospace Engineering,
Nanyang Technological University
, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
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H. Y. Li,
H. Y. Li
School of Mechanical and Aerospace Engineering,
Nanyang Technological University
, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
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J. C. Chai
J. C. Chai
Mechanical Engineering Department, The Petroleum Institute
, Abu Dhabi, United Arab Emirates
Search for other works by this author on:
L. W. Jin
School of Mechanical and Aerospace Engineering,
Nanyang Technological University
, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
K. C. Leong
School of Mechanical and Aerospace Engineering,
Nanyang Technological University
, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
e-mail: mkcleong@ntu.edu.sg
I. Pranoto
School of Mechanical and Aerospace Engineering,
Nanyang Technological University
, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
H. Y. Li
School of Mechanical and Aerospace Engineering,
Nanyang Technological University
, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
J. C. Chai
Mechanical Engineering Department, The Petroleum Institute
, Abu Dhabi, United Arab Emirates
J. Thermal Sci. Eng. Appl. Jun 2011, 3(2): 024502 (6 pages)
Published Online: July 5, 2011
Article history
Received:
October 27, 2010
Revised:
March 29, 2011
Online:
July 5, 2011
Published:
July 5, 2011
Citation
Jin, L. W., Leong, K. C., Pranoto, I., Li, H. Y., and Chai, J. C. (July 5, 2011). "Experimental Study of a Two-Phase Thermosyphon With Porous Graphite Foam Insert." ASME. J. Thermal Sci. Eng. Appl. June 2011; 3(2): 024502. https://doi.org/10.1115/1.4003885
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