Evaporating characteristics of sessile droplet on hydrophobic and hydrophilic surfaces

Shin, Dong Hwan; Lee, Seong Hyuk; Jung, Jung-Yeul; Yoo, Jung Yul

doi:10.1016/j.mee.2009.01.026

Cited by 141 publications

(91 citation statements)

References 11 publications

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“…Lower contact angles resulted in a higher evaporation rate. 25 The dimensionless contact angle of the hydrophobic (plain copper) surface (h 0 phobic ) had a slightly higher value and shorter time (23 s) than did others when h 0 phobic reached 0.7. Fluctuating values were observed after 23 s, caused by the large amount of vapor bubble expansion and contraction inside the droplet.…”

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confidence: 88%

“…10,18,[20][21][22] Occasionally, evaporation begins in the CCR mode until the droplet reaches the receding contact angle, at which time it transitions to the CCA mode. 18,23,24 Recently, the effect of surface wettability on evaporation has been investigated extensively: hydrophilic surfaces and hydrophobic surfaces, 10,11,18,20,[25][26][27][28] and more specifically, superhydrophilic and superhydrophobic situations 10,18,20,[28][29][30][31][32][33] have been explored. Kulinich and Farzaneh 30 observed that water droplets evaporated rapidly on a surface with high contact angle hysteresis (CAH).…”

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confidence: 99%

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Influence of surface temperature and wettability on droplet evaporation

Hsu

et al. 2015

Applied Physics Letters

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The evaporation characteristics of sessile water droplets on various wettability substrates (hydrophilic, hydrophobic, and mixed wettability surfaces) were experimentally investigated in this study. Placing droplets on a regulated superheated surface led to rapid vapor bubble formation. The droplet parameters, such as the contact angle and volume evolution over evaporation time, were experimentally measured. The results revealed that surface wettability plays a critical role not only in vapor bubble dynamics but also in evaporation. V C 2015 AIP Publishing LLC.

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confidence: 88%

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confidence: 99%

Influence of surface temperature and wettability on droplet evaporation

Hsu

et al. 2015

Applied Physics Letters

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“…The influence of the retraction of the contact line during drying is addressed for two limiting drying modes [1]: the constant contact angle mode, in which the droplet radius decreases with time and the contact angle remains fixed, and the constant contact area mode, wherein the contact line is pinned throughout drying. The former mode occurs on substrates with low contact angle hysteresis and is often observed on hydrophobic substrates [2]. Contact line pinning is enhanced by surface roughness, chemical heterogeneities, or particles inside the droplet.…”

Section: Introductionmentioning

confidence: 99%

Evaporation of picoliter droplets on surfaces with a range of wettabilities and thermal conductivities

et al. 2012

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Publisher's copyright statement:Reprinted with permission from the American Physical Society: Talbot, E.L., Berson, A., Brown, P.S. and Bain, C.D. Physical Review E, 85, 061604, 2012. c 2012 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The evaporation of picoliter water and ethanol droplets generated by drop-on-demand inkjet printing was investigated on substrates with apparent contact angles between 10• and 135• and thermal conductivities between 0.25 and 149 W m −1 K −1 . Drying times were calculated from a diffusion-limited model for droplets with both pinned and moving contact lines as a function of droplet diameter and apparent contact angle. Droplets with a moving contact line take longer to dry on hydrophilic substrates than pinned droplets. The difference in drying times between evaporative modes vanishes at large apparent contact angles. Hence similar drying times are obtained for both modes on hydrophobic substrates. The predicted drying times for glass and silicon substrates were in good quantitative agreement with experimental data, suggesting that thermal effects are negligible for substrates of these base materials. However, on a PTFE substrate which has a lower thermal conductivity more relevant to inkjet printing, evaporative cooling reduces the evaporation rate causing drying times to be underpredicted by isothermal models.

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“…In such technologies, the evaporation rate is a key contributor to the overall system efficiency -as it dictates the droplet lifetime and corresponding rates of heat and mass transfer. With this said, a droplet's evaporation rate ( _ m LG ) is commonly correlated with several interdependent factors/parameters, including contact line dynamics/motion [7,[13][14][15][16]; substrate surface structure [17], energy [18], and thermal conductivity [19]; vapor/gas concentration and convection [20,21]; and the thermofluid properties of the evaporating fluid itself [22]. Thus, from an overarching perspective, droplet evaporation can be considered a relatively complex phenomena.…”

Section: Introductionmentioning

confidence: 99%