The present research is an experimental study for the enhancement of boiling heat transfer using microporous coatings. Two types of coatings are investigated: one that is bonded using epoxy and the other by soldering. Effects on pool boiling performance were investigated, of different metal particle sizes of the epoxy-based coating, on R-123 refrigerants, and on water. All boiling tests were performed with 1 cm × 1 cm test heaters in the horizontal, upward-facing orientation in saturated conditions at atmospheric pressure and under increasing heat flux. The surface enhanced by the epoxy-based microporous coatings significantly augmented both nucleate boiling heat transfer coefficients and critical heat flux (CHF) of R-123 relative to those of a plain surface. However, for water, with the same microporous coating, boiling performance did not improve as much, and thermal resistance of the epoxy component limited the maximum heat flux that could be applied. Therefore, for water, to seek improved performance, the solder-based microporous coating was applied. This thermally conductive microporous coating, TCMC, greatly enhanced the boiling performance of water relative to the plain surface, increasing the heat transfer coefficient up to ∼5.6 times, and doubling the CHF.
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Research-Article
Microporous Coatings to Maximize Pool Boiling Heat Transfer of Saturated R-123 and Water
Joo Han Kim,
Joo Han Kim
Department of Mechanical and
Aerospace Engineering,
Aerospace Engineering,
The University of Texas at Arlington
,Arlington, TX 76019
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Ajay Gurung,
Ajay Gurung
Department of Mechanical and
Aerospace Engineering,
Aerospace Engineering,
The University of Texas at Arlington
,Arlington, TX 76019
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Miguel Amaya,
Miguel Amaya
Department of Mechanical and
Aerospace Engineering,
Aerospace Engineering,
The University of Texas at Arlington
,Arlington, TX 76019
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Sang Muk Kwark,
Sang Muk Kwark
Department of Mechanical and
Aerospace Engineering,
Aerospace Engineering,
The University of Texas at Arlington
,Arlington, TX 76019
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Seung M. You
Seung M. You
1
Department of Mechanical Engineering,
e-mail: you@utdallas.edu
The University of Texas at Dallas
,Richardson, TX 75080
e-mail: you@utdallas.edu
1Corresponding author.
Search for other works by this author on:
Joo Han Kim
Department of Mechanical and
Aerospace Engineering,
Aerospace Engineering,
The University of Texas at Arlington
,Arlington, TX 76019
Ajay Gurung
Department of Mechanical and
Aerospace Engineering,
Aerospace Engineering,
The University of Texas at Arlington
,Arlington, TX 76019
Miguel Amaya
Department of Mechanical and
Aerospace Engineering,
Aerospace Engineering,
The University of Texas at Arlington
,Arlington, TX 76019
Sang Muk Kwark
Department of Mechanical and
Aerospace Engineering,
Aerospace Engineering,
The University of Texas at Arlington
,Arlington, TX 76019
Seung M. You
Department of Mechanical Engineering,
e-mail: you@utdallas.edu
The University of Texas at Dallas
,Richardson, TX 75080
e-mail: you@utdallas.edu
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 7, 2014; final manuscript received March 3, 2015; published online April 16, 2015. Assoc. Editor: Keith Hollingsworth.
J. Heat Transfer. Aug 2015, 137(8): 081501 (7 pages)
Published Online: August 1, 2015
Article history
Received:
February 7, 2014
Revision Received:
March 3, 2015
Online:
April 16, 2015
Citation
Han Kim, J., Gurung, A., Amaya, M., Muk Kwark, S., and You, S. M. (August 1, 2015). "Microporous Coatings to Maximize Pool Boiling Heat Transfer of Saturated R-123 and Water." ASME. J. Heat Transfer. August 2015; 137(8): 081501. https://doi.org/10.1115/1.4030245
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