Effect of Surface Wettability on Active Nucleation Site Density During Pool Boiling of Water on a Vertical Surface

Wang, C. H.; Dhir, Vijay K.

doi:10.1115/1.2910737

Cited by 478 publications

(165 citation statements)

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“…However the above introduction shows that the influence of wettability on boiling is complex: while hydrophobic zones promotes nucleation, the surface hydrophilicity does enhance the CHF 10 . In this work we take advantage of microlithography techniques to design surfaces combining hydrophobic and hydrophilic zones, for pool boiling experiments.…”

mentioning

confidence: 99%

Do surfaces with mixed hydrophilic and hydrophobic areas enhance pool boiling?

Betz

Qiu

et al. 2010

Applied Physics Letters

371

150

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We demonstrate that smooth and flat surfaces combining hydrophilic and hydrophobic patterns improve pool boiling performance. Compared to a hydrophilic surface with 7º wetting angle, the measured critical heat flux and heat transfer coefficients of the enhanced surfaces are up to respectively 65 and 100% higher. Different networks combining hydrophilic and hydrophobic regions are characterized. While all tested networks enhance the heat transfer coefficient, large enhancements of critical heat flux are typically found for hydrophilic networks featuring hydrophobic islands. Hydrophilic networks indeed are shown to prevent the formation of an insulating vapor layer.

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mentioning

confidence: 99%

Do surfaces with mixed hydrophilic and hydrophobic areas enhance pool boiling?

Betz

Qiu

et al. 2010

Applied Physics Letters

371

150

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“…Such modification generally increases surface wettability, which causes an increased CHF through the enhanced liquid spreading over the heated area. 14,15 Another effect of the surface modification is to increase the number of microscale cavities, which serve as the starting sites for heterogeneous nucleation of liquid for bubble formation. 1,2 The relevant sizes of such cavities are generally in the range of tens to hundreds of micrometers.…”

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confidence: 99%

Nanowires for Enhanced Boiling Heat Transfer

et al. 2009

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Boiling is a common mechanism for liquid−vapor phase transition and is widely exploited in power generation and refrigeration devices and systems. The efficacy of boiling heat transfer is characterized by two parameters: (a) heat transfer coefficient (HTC) or the thermal conductance; (b) the critical heat flux (CHF) limit that demarcates the transition from high HTC to very low HTC. While increasing the CHF and the HTC has significant impact on system-level energy efficiency, safety, and cost, their values for water and other heat transfer fluids have essentially remained unchanged for many decades. Here we report that the high surface tension forces offered by liquids in nanowire arrays made of Si and Cu can be exploited to increase both the CHF and the HTC by more than 100%.

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“…Furthermore, surface wettability can also influence the critical heat flux. [141,142] By introducing SHPL stripes, higher heat transfer performance is observed with more interlaced SHPL lines (Figure 7g), which can be used to improve the heat transfer efficiency in industrial boilers. [143] Another promising field over the past few decades is organic/inorganic hybrid devices, such as organic thin film transistor, organic solar cells, and sensors.…”

Section: Broad Applications Of Slpl Interfaces In Scientific Researchmentioning

confidence: 99%

Superlyophilic Interfaces and Their Applications

et al. 2017

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Superlyophilic interfaces denote interfaces displaying strong affinity to diverse liquids, including superhydrophilic, superoleophilic, and superamphiphilic interfaces. When coming in contact with these interfaces, water or oil droplets tend to spread completely with contact angles close to 0°, presenting versatile applications including self‐cleaning, antifogging, controllable liquid transport, liquid separation, and so forth. Inspired by nature, scientists have developed various kinds of artificial superlyophilic (SLPL) interfaces in the past decades. In terms of dimensional characteristics, the artificial SLPL interfaces can be divided into four categories: i) 0D particles, whose dispersibility or catalytic performance can be notably enhanced by superlyophilicity; ii) 1D micro‐/nanofibers or nanotubes/channels, which can efficiently transfer liquids with SLPL interfaces; iii) 2D flat SLPL interfaces, on which different functional molecules can be deposited uniformly, forming ultrathin and smooth films; and iv) 3D structures, which can be obtained by either constructing 0D, 1D, or 2D SLPL materials separately or directly fabricating random SLPL frameworks, and can always be used as functional coatings or bulk materials. Here, natural and artificial SLPL interfaces are briefly introduced, followed by a short discussion of the limit between lyophilicity and lyophobicity, and then a snapshot of methods to generate SLPL interfaces is given. Specific focus is placed on recent achievements of constructing SLPL interfaces from zero to three dimensions. Following that, broad applications of SLPL interfaces in commercial areas will be introduced. Finally, a short summary and outlook for future challenges in this field is presented.

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Effect of Surface Wettability on Active Nucleation Site Density During Pool Boiling of Water on a Vertical Surface

Cited by 478 publications

References 0 publications

Do surfaces with mixed hydrophilic and hydrophobic areas enhance pool boiling?

Do surfaces with mixed hydrophilic and hydrophobic areas enhance pool boiling?

Nanowires for Enhanced Boiling Heat Transfer

Superlyophilic Interfaces and Their Applications

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