Nanofluid boiling: The effect of surface wettability

Coursey, Johnathan S.; Kim, Jungho

doi:10.1016/j.ijheatfluidflow.2008.07.004

Cited by 235 publications

(85 citation statements)

References 26 publications

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“…This observation was based on a review of the prevalent CHF theories, which state that the improved wettability caused by the nanoparticle layer can be used to predict CHF enhancement. In pool-boiling experiments with water-based and alcohol-based nanofluids on a plain heated surface, the deposition of nanoparticles on the boiling surface changes the surface microstructure and physicochemical properties [6,7]. Such changes in the heating surface significantly influence the boiling phenomena by changing the nucleation site density, bubble departure diameter, bubble frequency, and evaporation of the microlayer and macrolayer beneath the growing bubbles.…”

Section: Nanofluids In Pool Boilingmentioning

confidence: 99%

The Effect of Micro/Nanoscale Structures on CHF Enhancement

Ahn¹,

Kim

2011

Nuclear Engineering and Technology

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Section: Nanofluids In Pool Boilingmentioning

confidence: 99%

The Effect of Micro/Nanoscale Structures on CHF Enhancement

Ahn¹,

Kim

2011

Nuclear Engineering and Technology

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“…According to common consensus by researchers [7][8][9][10][11][12], this nanoparticle deposition layer is the primary mechanism for CHF enhancement, as it changes the porosity and the hydrophilicity of the surface, altering the dynamics of the three phase interface at the heater surface.  Most of the studies report significant CHF enhancement (up to 200%) with nanofluids compared to water [5][6][7][8][9][10][11][12][13][14][15][16][17][18].  Even relatively low concentrations (<1% by volume) of nanoparticles are capable to enhance CHF.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of transient critical heat flux of water-based zinc–oxide nanofluids

Sharma

Buongiorno

McKrell

et al. 2013

International Journal of Heat and Mass Transfer

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Pool boiling experiments were conducted for sandblasted stainless steel (grade 316) plate heaters submerged in deionized (DI) water and water-based zinc-oxide nanofluid, for transient heat flux conditions with power through the heaters increasing quadratically with time. Heat flux in the experiments was increased from zero to CHF in short time frames of 1, 10 and 100 s. Consistent with previous studies, transient CHF for DI water was higher than steady state CHF, and CHF increased with decreasing duration of the transient. Additionally, it was observed that for nanofluid tests, a porous and hydrophilic nanoparticle layer started to deposit on the heater surface in short time frames of 10 and 100 s, and this layer was responsible for the enhanced CHF compared to DI water. However, for the 1 s tests, nanoparticle deposition did not occur and consequently the CHF was not enhanced. Finally, experiments with heaters pre-coated with nanoparticles were performed and it was found that CHF was enhanced for all transient durations down to 1 s, establishing firmly that the CHF enhancement occurs due to surface modifications by the deposited nanoparticles, and not by nanoparticles suspended in solution. Keywords

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“…In the other words, the highly wetting surface, which is a lower contact angle, enhances the CHF of the pool boiling (Kim, S. J. et al, 2007;Coursey & Kim, 2008;. Fig.…”

Section: Pool Boilingmentioning

confidence: 97%