Wettability influence on the onset temperature of pool boiling: Experimental evidence onto ultra-smooth surfaces

Bourdon, B.; Bertrand, Emanuel; Marco, Paolo Di; Marengo, Marco; Rioboo, Romain; Coninck, J. De

doi:10.1016/j.cis.2015.04.004

Cited by 91 publications

(35 citation statements)

References 41 publications

(52 reference statements)

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“…Bourdon et al . 25 used ultra-smooth featureless glass surfaces to essentially suppress the influence of surface topography on ONB. Specifically, by chemically grafting SAM (self-assembled layers) onto the surface, they showed a dramatic decline of the incipient boiling superheat with decreasing wettability.…”

Section: Introductionmentioning

confidence: 99%

Early Onset of Nucleate Boiling on Gas-covered Biphilic Surfaces

Shen

Yamada

Hidaka

et al. 2017

Sci Rep

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For phase-change cooling schemes for electronics, quick activation of nucleate boiling helps safeguard the electronics components from thermal shocks associated with undesired surface superheating at boiling incipience, which is of great importance to the long-term system stability and reliability. Previous experimental studies show that bubble nucleation can occur surprisingly early on mixed-wettability surfaces. In this paper, we report unambiguous evidence that such unusual bubble generation at extremely low temperatures—even below the boiling point—is induced by a significant presence of incondensable gas retained by the hydrophobic surface, which exhibits exceptional stability even surviving extensive boiling deaeration. By means of high-speed imaging, it is revealed that the consequently gassy boiling leads to unique bubble behaviour that stands in sharp contrast with that of pure vapour bubbles. Such findings agree qualitatively well with numerical simulations based on a diffuse-interface method. Moreover, the simulations further demonstrate strong thermocapillary flows accompanying growing bubbles with considerable gas contents, which is associated with heat transfer enhancement on the biphilic surface in the low-superheat region.

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Section: Introductionmentioning

confidence: 99%

Early Onset of Nucleate Boiling on Gas-covered Biphilic Surfaces

Shen

Yamada

Hidaka

et al. 2017

Sci Rep

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“…Such interest is associated with the need to reduce the superheating at the onset of nucleate boiling, as well as with the possibility of using such coatings for fouling inhibition during boiling of aqueous solutions [3], which is very important task for improvement the efficiency of heat exchange equipment. In addition, some authors have shown that the usage of hydrophobic coatings makes it possible to significantly improve the heat transfer intensity at nucleate boiling [4][5][6][7]. However there are some studies, which indicate negative effect of the increase of contact angle on the heat transfer coefficient at boiling [8].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Boiling Heat Transfer on Hydrophobic Surface

2019

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The paper presents the results of an experimental study of the effect of hydrophobic fluoropolymer coating on the multiscale characteristics of heat transfer at water boiling. New experimental data on dynamics of vapor bubble growth and detachment, evolution of contact line, nucleation site density, heat transfer coefficient were obtained using high-speed imaging techniques, including infrared thermography and video recording from the bottom side of transparent ITO heater. It was shown, that the using of hydrophobic fluoropolymer coating leads to heat transfer enhancement, to decrease of the superheat temperature at the onset of boiling, to increase of the active nucleation site density and to significant change in the dynamics of growth and departure of vapor bubbles and the evolution of the triple contact line.

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“…Past studies have identified surface wettability as one of the most important factors affecting bubble nucleation, growth and detachment (e.g., [27,[52][53][54]) and they provide a good summary of the current understanding. The effect of surface wettability on bubble growth can be incorporated in a numerical model by the imposed contact angle between the vapour/liquid interface and the heated solid surface (triple-line).…”

Section: Effect Of Surface Wettability-series Bmentioning

confidence: 99%

An Enhanced VOF Method Coupled with Heat Transfer and Phase Change to Characterise Bubble Detachment in Saturated Pool Boiling

2017

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The present numerical investigation identifies quantitative effects of fundamental controlling parameters on the detachment characteristics of isolated bubbles in cases of pool boiling in the nucleate boiling regime. For this purpose, an improved Volume of Fluid (VOF) approach, developed previously in the general framework of OpenFOAM Computational Fluid Dynamics (CFD) Toolbox, is further coupled with heat transfer and phase change. The predictions of the model are quantitatively verified against an existing analytical solution and experimental data in the literature. Following the model validation, four different series of parametric numerical experiments are performed, exploring the effect of the initial thermal boundary layer (ITBL) thickness for the case of saturated pool boiling of R113 as well as the effects of the surface wettability, wall superheat and gravity level for the cases of R113, R22 and R134a refrigerants. It is confirmed that the ITBL is a very important parameter in the bubble growth and detachment process. Furthermore, for all of the examined working fluids the bubble detachment characteristics seem to be significantly affected by the triple-line contact angle (i.e., the wettability of the heated plate) for equilibrium contact angles higher than 45 • . As expected, the simulations revealed that the heated wall superheat is very influential on the bubble growth and detachment process. Finally, besides the novelty of the numerical approach, a last finding is the fact that the effect of the gravity level variation in the bubble detachment time and the volume diminishes with the increase of the ambient pressure.

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Wettability influence on the onset temperature of pool boiling: Experimental evidence onto ultra-smooth surfaces

Cited by 91 publications

References 41 publications

Early Onset of Nucleate Boiling on Gas-covered Biphilic Surfaces

Early Onset of Nucleate Boiling on Gas-covered Biphilic Surfaces

Characteristics of Boiling Heat Transfer on Hydrophobic Surface

An Enhanced VOF Method Coupled with Heat Transfer and Phase Change to Characterise Bubble Detachment in Saturated Pool Boiling

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