Dissipation in rapid dynamic wetting

Carlson, Andreas; Do-Quang, Minh; Amberg, Gustav

doi:10.1017/jfm.2011.211

Cited by 83 publications

(80 citation statements)

References 45 publications

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“…The spreading dynamics of low-viscosity drops (e.g. water) follow a power law r = Kt 0.5 , which is independent of the liquid viscosity and surface wettability (Biance et al 2004;Bird et al 2008;Carlson et al 2011;Chen et al 2011;Winkels et al 2012;Stapelbroek et al 2014). The quantity r is the spreading radius, t is the spreading time and K is a coefficient.…”

Section: Water Spreading Dynamicsmentioning

confidence: 99%

CFD simulation and validation of self-cleaning on solar panel surfaces with superhydrophilic coating

Bodard

Sari

et al. 2015

Future Cities and Environment

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Solar panel conversion efficiency, typically in the twenty percent range, is reduced by dust, grime, pollen, and other particulates that accumulate on the solar panel. Cleaning dirty panels to maintain peak efficiency, which is especially hard to do for large solar-panel arrays. To develop a transparent, anti-soiling Nano-TiO 2 coating to minimize the need for occasional cleaning is the purpose of this study. In our study, a 2D rainwater runoff model along tilted solar panel surface based on the Nusselt solution was established to have better understanding and predicting the behavior of runoff rain water, especially in contact with solar-panel surfaces with Nano-TiO 2 coating. Our simulation results demonstrate that solar-panel surfaces with Nano-TiO 2 coating create a superhydrophilic surface which cannot hold water, showing features of more pronounced in increasing runoff water film velocity comparing to the uncoated surfaces during raining event resulting in better effect of self-cleaning. Validation of our model was performed on titled solar panels for real time outdoor exposure testing in Switzerland. It is found that the dust particles are not easy to adhere to the coated surfaces of the slides comparing with uncoated surfaces, showing great potential for its use in harsh environmental conditions. This study suggests that superhydrophilic self-cleaning solar panel coating maximize energy collection and increases the solar panel's energy efficiency.

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Section: Water Spreading Dynamicsmentioning

confidence: 99%

CFD simulation and validation of self-cleaning on solar panel surfaces with superhydrophilic coating

Bodard

Sari

et al. 2015

Future Cities and Environment

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“…This macroscopic dissipation was defined by a friction factor local at the contact line, which has the same units as viscosity. Others [8][9][10][11][12] have also discussed the importance of local non-hydrodynamic effects at the contact line, with different interpretations of its microscopic origin. Recently [13] a friction factor was estimated from the molecular kinetic theory by fitting the experimental spreading radius for drops with different viscosity.…”

mentioning

confidence: 99%

“…Important to note, however, is that in [8] ǫ has been varied one order of magnitude, without any noticeable change in the results or any increase in viscous dissipation.…”

mentioning

confidence: 99%

Universality in dynamic wetting dominated by contact-line friction

2012

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We report experiments on the rapid contact line motion present in the early stages of capillary driven spreading of drops on dry solid substrates. The spreading data fails to follow a conventional viscous or inertial scaling. By integrating experiments and simulations, we quantify a contact line friction (µ f ), which is seen to limit the speed of the rapid dynamic wetting. A scaling based on this contact line friction is shown to yield a universal curve for the evolution of the contact line radius as a function of time, for a range of fluid viscosities, drop sizes and surface wettabilities.

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“…There are other relevant works that have been done on nonreactive wetting [54,[84][85][86][87][88][89][90][91][92][93][94]. [30].…”

Section: Nonreactive Wettingmentioning

confidence: 99%

Progress in Wettability Study of Reactive Systems

Komolafe

Medraj

2014

Journal of Metallurgy

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A review of various factors affecting wetting and spreading has been presented. Various methods for wettability studies and critical issues concerning contact angle measurement are discussed. Reactive wetting has been given a special attention in the paper and recent developments in this area are summarized and discussed. Although advanced understanding of nonreactive wetting is currently available in the literature, complete understanding of reactive wetting is still lacking due to the complexity of the phenomenon. To date, there is no single model that is generally applicable to all reactive wetting systems. Reaction between the liquid drop and substrate can take the form of dissolution, intermetallic formation, or combination of both processes. Factors affecting wettability have been summarized and discussed as well as the major available techniques to investigate wetting behaviour.

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Dissipation in rapid dynamic wetting

Cited by 83 publications

References 45 publications

CFD simulation and validation of self-cleaning on solar panel surfaces with superhydrophilic coating

CFD simulation and validation of self-cleaning on solar panel surfaces with superhydrophilic coating

Universality in dynamic wetting dominated by contact-line friction

Progress in Wettability Study of Reactive Systems

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