Dynamic wetting and boiling characteristics on micro-structured and micro/nano hierarchically structured surfaces

Moon, Hyun Soo; Yoon, Young Joong; Park, Jeong Ho; Myung, Byung Soo; Kim, Dong Eok

doi:10.1016/j.expthermflusci.2015.11.019

Cited by 31 publications

(5 citation statements)

References 29 publications

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“…There appears to be no consistent trend between average roughness and the level of wetting as measured; however, resolution limitations of optical techniques may have been a factor, and other measurements of roughness may be more suitable than Sa. These measurements suggest that the type of surface structure itself is more significant than average roughness in determining the eventual level of wetting, which correlates well with the literature [17,18].…”

Section: Resultssupporting

confidence: 88%

Superhydrophobicity Graving on Metallic Surface via Hierarchical Structure

Zheng

Lang

Feng

2023

Preprint

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Using a sub-five picosecond laser, we investigated the creation of diverse surface structures on carbon nanotube-reinforced polymer composites. The composite material exhibited a transition in surface properties, beginning with laser-induced periodic surface structures (LIPSS) at a scale of approximately 1 μm, transforming into a double structure consisting of grains and LIPSS with mountain-like features. By conducting contact angle measurements, we assessed the wettability of the composite surface and observed a remarkable shift from hydrophilicity (63.6°) to superhydrophobicity (160.0°) as a result of the laser processing. This change led to an increase in the contact angle by approximately 100.0°, which was attributed to the creation of hierarchical surface structures showcasing the rose petal effect. Additionally, we quantified the contact angle hysteresis and surface roughness for further characterization. The utilization of a picosecond laser in generating such surfaces represents a promising and cost-effective alternative to femtosecond laser techniques.

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Section: Resultssupporting

confidence: 88%

Superhydrophobicity Graving on Metallic Surface via Hierarchical Structure

Zheng

Lang

Feng

2023

Preprint

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“…The maximum reported HTC values on untreated surfaces are usually in the range of 20-60 kW m -2 K -1 . Using water as the working fluid, the CHF alone can be enhanced by coupling the hydrophilicity and micro/nanoroughness via nanowires or nanotubes [31,92,93], bio-templating [12], sintering [9,20,21], hierarchical structuring [42,94,95] or oxidation [28].…”

Section: Pool Boiling Enhancementmentioning

confidence: 99%

Laser Surface Engineering for Boiling Heat Transfer Applications

Zupančič

Gregorčič

2021

Materials With Extreme Wetting Properties

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Nucleate boiling is inseparably connected with our everyday life. It is not only utilized in simple tasks like cooking, but it is also important for applications on various scales, ranging from enormous nuclear power plants to miniature microelectronics. This widespread integration is the result of its ability for effective heat transfer at low temperature differences between the heated surface and the surrounding fluid. The surface wettability undoubtedly influences the boiling heat transfer, but the observed behaviour cannot be explained without taking into account the surface topography and chemical modifications due to intense boiling processes. This chapter demonstrates how nucleate boiling enhancement can be achieved on surfaces with various wetting properties and specific micro/nano topographical features, fabricated using a straightforward, robust and scalable laser texturing approach. We discuss the basics of nucleate boiling and how it is affected by surface wettability; provide a fundamental background of laser surface engineering and its ability to achieve extreme wetting properties; and finally demonstrate the applicability of the laser-textured surfaces in enhancing and controlling nucleate pool boiling of different fluids. We show how laser surface engineering decreases the wettability effects on the key boiling parameters andin this wayensures more stable heat transfer performance.

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“…These separated paths may lead to a decline in flow resistance, which results in an enhancement in CHF. Further enhancement in CHF by micro-fabrication techniques can be achieved by the use of microstructures that are coated with zinc oxide nano-rods [44], silicon nanowires [45,46], sintered surface [47,48] and the tobacco mosaic virus [49].…”

Section: Chf Enhancement By Modifying Surface Characteristicsmentioning

confidence: 99%

Recent Advances in the Critical Heat Flux Amelioration of Pool Boiling Surfaces Using Metal Oxide Nanoparticle Deposition

et al. 2020

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Pool boiling is an effective heat transfer process in a wide range of applications related to energy conversion, including power generation, solar collectors, cooling systems, refrigeration and air conditioning. By considering the broad range of applications, any improvement in higher heat-removal yield can ameliorate the ultimate heat usage and delay or even avoid the occurrence of system failures, thus leading to remarkable economic, environmental and energy efficiency outcomes. A century of research on ameliorating critical heat flux (CHF) has focused on altering the boiling surface characteristics, such as its nucleation site density, wettability, wickability and heat transfer area, by many innovative techniques. Due to the remarkable interest of using nanoparticle deposition on boiling surfaces, this review is targeted towards investigating whether or not metal oxide nanoparticles can modify surface characteristics to enhance the CHF. The influence of nanoparticle material, thermo-physical properties, concentration, shape, and size are categorized, and the inconsistency or contradictions of the existing research results are recognized. In the following, nanoparticle deposition methods are presented to provide a worthwhile alternative to deposition rather than nanofluid boiling. Furthermore, possible mechanisms and models are identified to explain the amelioration results. Finally, the present status of nanoparticle deposition for CHF amelioration, along with their future challenges, amelioration potentials, limitations, and their possible industrial implementation, is discussed.

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Dynamic wetting and boiling characteristics on micro-structured and micro/nano hierarchically structured surfaces

Cited by 31 publications

References 29 publications

Superhydrophobicity Graving on Metallic Surface via Hierarchical Structure

Superhydrophobicity Graving on Metallic Surface via Hierarchical Structure

Laser Surface Engineering for Boiling Heat Transfer Applications

Recent Advances in the Critical Heat Flux Amelioration of Pool Boiling Surfaces Using Metal Oxide Nanoparticle Deposition

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