Surface wettability control by nanocoating: The effects on pool boiling heat transfer and nucleation mechanism

Phan, Hai Trieu; Caney, Nadia; Marty, Philippe; Colasson, Stéphane; Gavillet, J.

doi:10.1016/j.ijheatmasstransfer.2009.06.032

Cited by 406 publications

(171 citation statements)

References 26 publications

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“…hydrophobic and hydrophilic. Bubble nucleation occurs at very low superheating on a hydrophobic surface and it has better heat transfer coefficient (HTC) at low heat flux (3), (4) . Conversely, on a hydrophilic surface the incipience of bubble nucleation is at high superheating and critical heat flux (CHF) increases to almost twice (5) .…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydrophobic-Spot Periphery and Subcooling on Nucleate Pool Boiling from a Mixed-Wettability Surface

Suroto

Tashiro

Hirabayashi

et al. 2013

JTST

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The effect of subcooling and length of hydrophobic-spot periphery on nucleate pool boiling heat transfer from TiO 2 -coated surface with and without PTFE (polyetatafluoroethylene) hydrophobic circle spots at intermediate heat flux has been examined. The experiments are performed with liquid subcooling ranging from 0-20 K and heat transfer block used were TiO 2 -coated copper block with a PTFE hydrophobic circle spot with various diameters with total area of PTFE being constant. Bubble nucleation and behavior were observed by using high-speed camera. The results showed that the heat transfer performance of surfaces with PTFE hydrophobic circle spot is better than superhydrophilic surface in overall condition. Furthermore, the heat transfer performance decreases under subcooled condition for all surfaces. Increase in peripheral length of hydrophobic-spot enhances the heat transfer performance.

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Section: Introductionmentioning

confidence: 99%

Effects of Hydrophobic-Spot Periphery and Subcooling on Nucleate Pool Boiling from a Mixed-Wettability Surface

Suroto

Tashiro

Hirabayashi

et al. 2013

JTST

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“…Surface enhancement techniques for stainless steel and similar metals are limited to coatings and deposition techniques. [21][22][23] In this paper, a phenomenon referred to as "secondary boiling effects" is explored. Secondary boiling effects correspond to a decrease in wall superheat near the critical heat flux and are reflected by a "hook back" on the boiling curve.…”

mentioning

confidence: 99%

Secondary pool boiling effects

Kruse

Tsubaki

Zuhlke

et al. 2016

Applied Physics Letters

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A pool boiling phenomenon referred to as secondary boiling effects is discussed. Based on the experimental trends, a mechanism is proposed that identifies the parameters that lead to this phenomenon. Secondary boiling effects refer to a distinct decrease in the wall superheat temperature near the critical heat flux due to a significant increase in the heat transfer coefficient. Recent pool boiling heat transfer experiments using femtosecond laser processed Inconel, stainless steel, and copper multiscale surfaces consistently displayed secondary boiling effects, which were found to be a result of both temperature drop along the microstructures and nucleation characteristic length scales. The temperature drop is a function of microstructure height and thermal conductivity. An increased microstructure height and a decreased thermal conductivity result in a significant temperature drop along the microstructures. This temperature drop becomes more pronounced at higher heat fluxes and along with the right nucleation characteristic length scales results in a change of the boiling dynamics. Nucleation spreads from the bottom of the microstructure valleys to the top of the microstructures, resulting in a decreased surface superheat with an increasing heat flux. This decrease in the wall superheat at higher heat fluxes is reflected by a “hook back” of the traditional boiling curve and is thus referred to as secondary boiling effects. In addition, a boiling hysteresis during increasing and decreasing heat flux develops due to the secondary boiling effects. This hysteresis further validates the existence of secondary boiling effects.

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“…However, the higher heat flux region is governed by a nucleate boiling, in which the nonwetting surface represents a larger bubble generation due to a higher nucleation cite density (Eddington & Kenning, 1979). Phan et al (2009aPhan et al ( , 2009b investigated the wettability effects on a nucleate boiling using various materials deposited on surfaces. In the hydrophobic surface, no bubble departure was noticed and the heat transfer was unstable when the bubbles stayed on the heating surface.…”

Section: Pool Boilingmentioning

confidence: 99%

“…For example, an enhancement of both the heat transfer and the critical heat flux using the hydrophobic and hydrophilic mixed surface was reported by Betz et al (2010). Various heat transfer applications related with these special surfaces are accelerated by new micro/nano structured surface fabrication techniques, because the surface wettability can be changed by only different material deposition (Phan et al, 2009b). In addition, many heat transfer systems become smaller, governing forces change from a body force to a surface force.…”

Section: Introductionmentioning

confidence: 99%