Enhancement of Pool Boiling Heat Transfer Using Aligned Silicon Nanowire Arrays

Shim, Dong Il; Choi, Geehong; Lee, Namkyu; Kim, Tae‐Hwan; Kim, Beom Seok; Cho, Hyung Hee

doi:10.1021/acsami.7b01929

Cited by 98 publications

(60 citation statements)

References 32 publications

(59 reference statements)

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“…In particular, it has been reported that aligned Si nanowire arrays can significantly enhance the critical heat flux compared to the random Si NWs in the case of pool boiling due to their higher wickability. 11 In this letter, we show that pattern Si nanowires can allow the shifting of the Leidenfrost temperature to higher values while maintaining a minimum droplet evaporation lifetime.…”

mentioning

confidence: 81%

Water droplet dynamics on a heated nanowire surface

Auliano

Fernandino

et al. 2018

Applied Physics Letters

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When a liquid droplet is deposited onto a heated surface, evaporation occurs. If the temperature of the surface is sufficiently high, bubbles are released from activated nucleation sites, making the heat transfer more efficient. However, if the temperature of the surface is further increased above the Leidenfrost point, a vapour cushion will form underneath the droplet, deteriorating the heat transfer between the surface and the droplet. In this work, we show that patterned Si nanowires can allow shifting the Leidenfrost temperature while maintaining a minimum droplet evaporation lifetime. In particular, it is observed that the Leidenfrost point is reached when the phase-change time scale compared to the wicking time scale becomes dominant. In this situation, the energy of the lift-off process is not sufficient for allowing the droplet to reach a sufficient height from where the droplet can penetrate in the porous surface.

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mentioning

confidence: 81%

Water droplet dynamics on a heated nanowire surface

Auliano

Fernandino

et al. 2018

Applied Physics Letters

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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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“…Studies have been carried out to enhance the CHF through surface modification at the microscale [4][5][6][7], nanoscale [8][9][10][11], and mixed micro/nanoscale [12][13][14]. Chu et al [4] reported an enhancement in the CHF on the surface of a micropillar array.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Pool Boiling on Hydrophilic Micro/Nanotextured Surfaces with Hydrophobic Patterns

et al. 2021

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Over the past decades, pool boiling on various wetting surfaces has been intensively investigated to enhance boiling heat transfer and critical heat flux. In this study, to enhance the two thermal performances simultaneously, we developed hydrophilic micro/nanotextured surfaces with hydrophobic patterns. Using a silicon substrate, well-arrayed microtextures and randomly arrayed nanotextures were fabricated hierarchically using micro/nanoelectromechanical system processes. The top of the microtextures was coated locally with hydrophobic characteristics using specific self-assembled monolayer coating methods. Based on experimental data, we postulate that the critical heat flux was enhanced by the capillary-induced flow between microtextures and that nanotextures with superhydrophilicity contribute to the delay of the critical heat flux by better wetting the dried area. Owing to the hydrophobicity at the top of the micropillars, the nucleate site density and boiling heat transfer increased.

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Enhancement of Pool Boiling Heat Transfer Using Aligned Silicon Nanowire Arrays

Cited by 98 publications

References 32 publications

Water droplet dynamics on a heated nanowire surface

Water droplet dynamics on a heated nanowire surface

Laser Surface Engineering for Boiling Heat Transfer Applications

Experimental Study on Pool Boiling on Hydrophilic Micro/Nanotextured Surfaces with Hydrophobic Patterns

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