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Research Papers: Evaporation, Boiling, and Condensation

Microporous Coatings to Maximize Pool Boiling Heat Transfer of Saturated R-123 and Water

[+] Author and Article Information
Joo Han Kim, Ajay Gurung, Miguel Amaya, Sang Muk Kwark

Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019

Seung M. You

Department of Mechanical Engineering,
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 137(8), 081501 (Aug 01, 2015) (7 pages) Paper No: HT-14-1066; doi: 10.1115/1.4030245 History: Received February 07, 2014; Revised March 03, 2015; Online April 16, 2015

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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Figures

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Fig. 5

Average boiling coefficient of ABM coatings in saturated R-123 at atmospheric pressure

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Fig. 4

Boiling curves of ABM coatings in saturated R-123 at atmospheric pressure

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Fig. 3

SEM Images of ABM microporous coatings made of various aluminum particle sizes

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Fig. 2

Boiling test heater assembly

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Fig. 1

Pool boiling test section

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Boiling curves of ABM coatings in saturated water at atmospheric pressure

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Fig. 7

Average boiling coefficient of ABM coatings in saturated water at atmospheric pressure

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Fig. 11

Average boiling coefficient of conductive microporous coatings (TCMC) in saturated water at atmospheric pressure

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Fig. 12

Boiling curves of the conductive microporous coating (TCMC), and best performing ABM coating in saturated water at atmospheric pressure

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Fig. 13

Average water pool boiling heat transfer coefficients of the conductive microporous coating (TCMC) and best performing ABM coating

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Fig. 8

SEM images of conductive microporous coatings (TCMC) made of various copper particle sizes

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Fig. 9

Optical microscope view of cross section of the conductive microporous coating (TCMC)

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Fig. 10

Boiling curves of conductive microporous coatings (TCMC) in saturated water at atmospheric pressure

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