Coalescence-induced nanodroplet jumping

Cha, Hyeongyun; Xu, Chenyu; Sotelo, Jesus; Chun, Jae Min; Yokoyama, Yukihiro; Enright, Ryan; Miljkovic, Nenad

doi:10.1103/physrevfluids.1.064102

Cited by 133 publications

(190 citation statements)

References 67 publications

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“…11 This passive jumping mechanism serves to decrease the maximum droplet departure size of the condensate by several orders of magnitude compared to gravitationally driven dropwise condensation. [11][12][13][14] As a result, the heat transfer coefficient of jumping-droplet condensation is at least 30% higher than classical dropwise [15][16][17] and can be even higher when using electric fields, 18,19 tall and interconnected nanowires, 20 or overlaying hydrophilic features. 21,22 The mechanism for out-of-plane droplet jumping is the impact of the coalescing liquid bridge against the low-adhesion substrate.…”

Section: Introductionmentioning

confidence: 99%

How Surface Orientation Affects Jumping-Droplet Condensation

Mukherjee

Berrier

Murphy

et al. 2019

Joule

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Because of its smaller condensate departure size, jumping-droplet condensation on superhydrophobic surfaces provides better heat transfer performance than does regular dropwise condensation. As the jumping mechanism is gravity independent, the effects of surface orientation on jumping-droplet condensation were previously ignored. Here, with the help of long-term condensation experiments on different surface orientations, it is shown that jumping-droplet condensers are dramatically enhanced when gravitational shedding complements the jumping. The analysis presented here can be useful in designing more efficient condensers.

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Section: Introductionmentioning

confidence: 99%

How Surface Orientation Affects Jumping-Droplet Condensation

Mukherjee

Berrier

Murphy

et al. 2019

Joule

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“…Enright et al investigated the fluid dynamics during coalescence‐induced drop jumping and found that only a small fraction of excess surface energy is convertible into translational kinetic energy. Further investigations aimed to optimize the surface structure of hierarchical SHS or one‐tier nanostructured SHS , to enhance jumping DWC. The jumping drops have also been found to be electrostatically charged , a property that was further investigated for its potential use in electric power generation and for its potential to enhance DWC via an external electric field , , .…”

Section: Advanced Functional Surfaces For Dwcmentioning

confidence: 99%

Dropwise Condensation on Advanced Functional Surfaces – Theory and Experimental Setup

2017

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Dedicated to Professor Rüdiger Lange on the occasion of his 65th birthdayCompared to filmwise condensation on conventional condenser surfaces, heat transfer can be significantly enhanced by tuning the wettability of the surface to promote dropwise condensation. Following rapid advances in surface engineering, the last years have seen an unprecedented interest in dropwise condensation research. This brief review highlights recent advances in theory and experimental investigation regarding dropwise condensation on smooth hydrophobic surfaces, micro-and nanostructured superhydrophobic surfaces, biphilic surfaces with patterned wettability, and lubricant-infused surfaces.

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“…However, some other investigations 4,30,33,35 have demonstrated that the size of self-jumping droplets can be downsized to nanoscale. Recently a molecular dynamics simulation 30 demonstrated that despite the large internal viscous dissipation, the coalesced nanodroplet on a super-hydrophobic surface can jump up, with a contact angle of approximately 180 degree.…”

mentioning

confidence: 99%

“…30 The coalescence-induced jumping of water nanodroplet (radius R ≈ 500 nm) was experimentally investigated on superhydrophobic surfaces of carbon nanotubes by varying the thickness of the conformal hydrophobic coating. 35 They showed that the minimum radius of 3 jumping nanodroplets increases with increasing solid fraction and decreasing apparent advancing contact angle.…”

mentioning

confidence: 99%

“…25 The experimental investigation explored the limitation to nanodroplet jumping due to surface adhesion in addition to the hydrodynamic limitation due to viscous dissipation. 35 They investigated condensation on carbon nanotube surfaces with an effective solid fraction of about 0.10 and found that surface adhesion plays a vital role in determining the minimum size of jumping nanodroplets. 35 It can be seen that the mechanism of nanodroplet jumping, particularly the adhesion effect at the liquid-solid interface at nanoscale, is still worthy of further investigation.…”

mentioning

confidence: 99%

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How solid surface free energy determines coalescence-induced nanodroplet jumping: A molecular dynamics investigation

Sheng

Sun

Wen

et al. 2017

Journal of Applied Physics

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Molecular dynamics simulation is performed to investigate how solid surface free energy determines the coalescence-induced jumping of nanodroplet on superhydrophobic surfaces. The nanodroplet-jumping is found highly sensitive to the solid surface free energy represented by the fluid-solid bonding strength parameter  . The coalesced-nanodroplet fails to jump off the surface when  is 0.15 (contact angle being 145º) while succeeds to jump off the surface when  is 0.05 (contact angle being 175º). We find that a small proportion (ca. 2~4%) of the surface free energy released in both cases is eventually converted to kinetic energy in the jumping direction, which is in the same order as the conversion efficiency previously predicted for microdroplets. A lower solid surface free energy decreases viscous and interfacial dissipation and hence increases the kinetic energy converted and eventually leads to sufficient kinetic energy in the jumping direction for nanodroplet to jump up. Our results also address the importance of the liquid-solid surface interaction in the coalescence-induced jumping of nanodroplets and the determination of the minimum size of jumping nanodroplets.

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Coalescence-induced nanodroplet jumping

Cited by 133 publications

References 67 publications

How Surface Orientation Affects Jumping-Droplet Condensation

How Surface Orientation Affects Jumping-Droplet Condensation

Dropwise Condensation on Advanced Functional Surfaces – Theory and Experimental Setup

How solid surface free energy determines coalescence-induced nanodroplet jumping: A molecular dynamics investigation

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