Enhanced boiling heat transfer surfaces

Scurlock, R.G.

doi:10.1016/0011-2275(95)90826-2

Cited by 35 publications

(8 citation statements)

References 3 publications

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“…In the present study, a similar trade-off in heat transfer coefficient with particle diameter is observed; however, the optimum particle size of 90-106 µm (at a layer thickness of 402 µm) is larger for the sintered copper particles. A similar increase compared to the predicted value was also observed by Scurlock [37], where the optimum coating thickness was 250 µm compared to the calculated superheated liquid layer thickness of 100 µm for liquid nitrogen. Chang and You [25] attributed this increased optimum thickness to the higher thermal conductivity of the plasma-sprayed aluminum particle coating.…”

Section: Sintered Particle Coatingsupporting

confidence: 86%

Effect of particle size on surface-coating enhancement of pool boiling heat transfer

Sarangi

Weibel

Garimella

2015

International Journal of Heat and Mass Transfer

123

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The enhancement of pool boiling heat transfer by copper-particle surface coatings is experimentally investigated, using the wetting dielectric fluid FC-72. In one technique, loose copper particles are placed on a heated copper surface to provide additional vapor nucleation sites in the cavities formed at particlesurface and particle-particle contact points, thereby enhancing boiling performance over a polished surface. This 'free-particle' technique is benchmarked against the more traditional technique of sintering a fixed layer of copper particles to the surface to enhance boiling heat transfer performance. The effect of particle size on the heat transfer performance is studied for particle diameters ranging from 45 µm to 1000 µm at a constant coating layer thickness-to-particle diameter ratio of approximately 4. The parametric trends in the boiling curve and the critical heat flux are compared between the two techniques, and the dominant boiling mechanisms influencing these trends are compared and contrasted. High-speed visualizations are performed to qualitatively assess the boiling patterns and bubble departure size/distribution, and thus corroborate the trends observed in the boiling curves. The measured wall superheat is significantly lower with a sintered coating compared to the free-particle layer for any given particle size and heat flux. Performance trends with respect to particle size, however, are remarkably similar for both enhancement techniques, and an optimum particle size of ~100 µm is identified for both free particles and sintered coatings. The free-particle technique is shown to offer a straightforward method to screen the boiling enhancement trends expected from different particulate layer compositions that are intended to be subsequently fabricated by sintering.

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Section: Sintered Particle Coatingsupporting

confidence: 86%

Effect of particle size on surface-coating enhancement of pool boiling heat transfer

Sarangi

Weibel

Garimella

2015

International Journal of Heat and Mass Transfer

123

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“…Surface enhancement techniques for pool boiling include porous microstructures formed by sintered metallic layers and porous coatings. Scurlock [6] presented experimental results for saturated pool boiling of liquid nitrogen and refrigerant R-12 on surfaces with porous aluminum/silicon coatings. The surfaces were manufactured by plasma spraying a mixture of aluminum powder with 10% silicon and polyester on to 50 mm × 50 mm aluminum plates, which were subsequently heated in air at 500 • C for 2 hr to evaporate the polyester.…”

Section: Effect Of Surface Modificationmentioning

confidence: 99%

Pool Boiling on Modified Surfaces Using R-123

Ahmad

Lewis

McGlen

et al. 2014

Heat Transfer Engineering

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“…One example is the metallic coating on heating surfaces. Few investigators like Bliss et al [4], Magrini and Nannei [5], Scurlock [6], Hsieh and Yang [7], Cieslinski [8], Rainey et al [9] and Kim et al [10] studied the boiling of liquids on metallic coated heating surfaces and observed a significant enhancement of the heat transfer coefficient. However, most of these investigations were confined to the boiling of water, refrigerants, cryogenics, etc.…”

Section: Introductionmentioning

confidence: 96%

Enhanced Boiling of Methanol on Copper Coated Surface

et al. 2007

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This paper presents an experimental investigation on nucleate pool boiling of saturated methanol on uncoated as well as copper-coated mild steel heating tubes of various thicknesses at atmospheric and subatmospheric pressures. It also includes the effect of heat flux, pressure and coating thickness on the boiling heat transfer coefficient of coated tube surfaces. Heat flux was progressively increased from 15,670.20 to 43,151.57 W/m 2 in six steps and pressure from 23.02 to 98.68 kN/m 2 in five steps. Boiling characteristics on such surfaces are compared with those on uncoated ones. Also, a criterion for enhanced boiling of methanol on copper-coated tubes is described.

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Enhanced boiling heat transfer surfaces

Cited by 35 publications

References 3 publications

Effect of particle size on surface-coating enhancement of pool boiling heat transfer

Effect of particle size on surface-coating enhancement of pool boiling heat transfer

Pool Boiling on Modified Surfaces Using R-123

Enhanced Boiling of Methanol on Copper Coated Surface

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