Effect of nanoparticle deposition on capillary wicking that influences the critical heat flux in nanofluids

By Hyungdae Kim, Moohwan Kim. 2007

307 citations recorded by the source corpus.

When nanofluids are boiled, nanoparticles are deposited on the heater surface, causing a significant critical heat flux (CHF) enhancement. The authors examined the effect of the surface wettability and the capillarity of the nanoparticle deposition layer on CHF. It is well known that the deposition of nanoparticles changes the surface wettability, but it also causes capillary wicking on a porous surface, whereby the supplied liquid effectively delays the irreversible growth of a dry patch. This study demonstrates that the outstanding CHF enhancement in nanofluids is the consequence of both the improved surface wettability and the capillarity of the nanoparticle deposition layer.

Subfields: Biomedical Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/df604f45c0702d1703ccd36c63d4039b507c4856

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In Biomedical Engineering

In Mechanical Engineering

Citations in the corpus

Effect of particle size on surface-coating enhancement of pool boiling heat transfer (2015, background): “deposition of the small particles on the surface, as is observed in the case of nanofluids [35], or to some roughening of the surface due to erosion by the motion of the suspended particles.”
The effect of capillary wicking action of micro/nano structures on pool boiling critical heat flux (2012, background): “Recently, Kim and Kim [6] postulated that the wettability and capillary wicking of a heated surface could influence the CHF enhancement.”
Recent developments on fractal-based approaches to nanofluids and nanoparticle aggregation (2017, background): “The density of active sites on the heater surface 10 is affected by the interaction among several parameters on the heater and the liquid 11 sides, as well as the liquid-solid contact angle [92, 93, 99-107].”
Review of pool boiling enhancement with additives and nanofluids (2018, background): “Kim and Kim [281] observed that CHF enhancement with nanofluids was accompanied by a decrease in contact angle, but CHF continued to increase after contact angle reached a smaller constant value, which they attributed to capillary wicking.”
Critical heat flux of pool boiling on Si nanowire array-coated surfaces (2011, background): “[11] have shown that a greater CHF is achieved for a surface with a larger capillary height where the height refers to the liquid column that can be sustained against gravity.”
Pool boiling CHF enhancement by micro/nanoscale modification of zircaloy-4 surface (2010, background): “However, in this study, therewas no ethod ofmeasuring the capillarity of the plate heater because the eater was not thin and cylindrical (Kim and Kim, 2007).”
Experimental study of critical heat flux enhancement during forced convective flow boiling of nanofluid on a short heated surface (2010, background): “Many recent studies for pool boiling of nanofluids (see e.g. Kim et al., 2006a, 2007b; Bang and Chang, 2005; Kim and Kim, 2007) reported that the key parameters of CHF enhancement in nanofluid were likely due to nanoparticles deposition during nucleate boiling of nanofluids and consequent changes of”