Investigation of droplet jumping on superhydrophobic coatings during dew condensation by the observation from two directions

Yanagisawa, Kenji; Sakai, Munetoshi; Isobe, Toshihiro; Matsushita, Sachiko; Nakajima, Akira

doi:10.1016/j.apsusc.2014.07.120

Cited by 68 publications

(36 citation statements)

References 41 publications

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“…[33][34][35][36] In view of this situation, a system with high-speed cameras is designed as shown in Figure 2. However, it's difficult to capture the detailed coalescence process as droplet coalescence in a few milliseconds and the visibility under condensation is poor.…”

Section: Methodsmentioning

confidence: 99%

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Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

et al. 2018

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In this work, the coalescence of two equal‐sized water droplets on superhydrophobic surfaces (SHSs) is experimentally investigated. The morphologies of droplet coalescence are observed from side‐view and bottom‐view using high‐speed camera system. The related morphology evolution and dynamics of droplet coalescence are explored. The dynamic behaviors of droplet coalescence on SHSs can be decomposed into liquid bridge growth, contact line evolution, and droplet jumping. The liquid bridge radius is proportional to the square root of time, whereas the dimensionless prefactor is decreased from 1.18 to 0.83 due to the transition of interface curvature. The retraction velocity of the contact line shows limited dependence on initial droplet radii as the retraction dynamics considered here are governed by the capillary–inertial effect. The coalesced droplet finally departs the substrate with a dimensionless jumping velocity of around 0.2. A heuristic argument is made to account for the nearly constant dimensionless jumping velocity. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2913–2921, 2018

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Section: Methodsmentioning

confidence: 99%

“…However, it's difficult to capture the detailed coalescence process as droplet coalescence in a few milliseconds and the visibility under condensation is poor. [33][34][35][36] In view of this situation, a system with high-speed cameras is designed as shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

et al. 2018

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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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“…They reported the local heat flux values on coated tube were higher than the bare tube in the upstream region. Yanagisawa et al [10] prepared a superhydrophobic surface with random nanoscale roughness using boehmite nanoparticles and analysed spontaneous jumping of the condensed water droplets from top and side directions. Roudgar and Coninck [11], investigated experimentally for dropwise condensation on copper substrate and reported that, in the early stage of condensation, condensation contact angle and contact angle hysteresis have an important effect on the nucleation and the condensation rate.…”

Section: Introductionmentioning

confidence: 99%

Study of droplet dynamics and condensation heat transfer on superhydrophobic copper surface

Yuvaraj¹,

Senthkil²

2021

THERM SCI

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Superhydrohobic surface for dropwise condensation is prepared using hotplate solution immersion method on copper substrate. The preprocessed bare copper plate is immersed in a solution consist of 0.004 -0.008M ethanol (CH3−CH2−OH) and tetradecanoic acid (CH3(CH2)12COOH) then heating the plates in the solution at 30 -50°C for 1 -6 hours. The contact angle of water droplet on the prepared surface is measured using Low Bond Axisymmetric Drop Shape Analysis (LBADSA), which gives the maximum contact angle of 168° and average value of 166° ± 2°. The maximum contact angle is obtained by adjusting the composition of the solution, temperature of the solution and immersion time to 0.006M, 45° and 4 hours respectively. The various superhydrophobic surfaces are prepared by changing constituents of solution, hotplate temperature and processing time respectively. Further dynamic behavior of water droplet on the prepared surfaces like jumping effect and rolling effect is presented in this work. In addition, experimental work is carried out on the prepared surface for dropwise condensation and the obtained results are compared with condensation on bare copper plate produces higher heat transfer coefficient.

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Investigation of droplet jumping on superhydrophobic coatings during dew condensation by the observation from two directions

Cited by 68 publications

References 41 publications

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

Dropwise Condensation on Advanced Functional Surfaces – Theory and Experimental Setup

Study of droplet dynamics and condensation heat transfer on superhydrophobic copper surface

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