Droplets evaporation: Problems and solutions

Semenov, S.; Starov, Victor; Velarde, Manuel G.; Rubio, Ramón G.

doi:10.1140/epjst/e2011-01468-1

Cited by 65 publications

(55 citation statements)

References 90 publications

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“…It was suggested in [1,[27][28] that for pure fluids the average temperature of the droplet-air interface, Tav, can be taken as a constant during the evaporation process. Thus at constant values of the ambient temperature, T∞, and the relative humidity, H, coefficient β remains constant during the evaporation process.…”

Section: Theorymentioning

confidence: 99%

“…Evaporation of liquid droplets in a gas volume has implications in different areas: spray drying and production of fine powders [1][2][3], spray cooling [4][5][6], fuel preparation [7-10], air humidifying [11], heat exchangers [12], drying in evaporation chambers of air conditioning systems [11,12], fire extinguishing [13,14], fuel spray auto ignition (Diesel) [15], solid surface templates from evaporation of nanofluid drops (coffee-ring effect) [16], spraying of pesticides [1][2][3], painting, coating and inkjet printing [17], printed MEMS devices, micro lens manufacturing, spotting of DNA microarray data [3,[18][19]. Because of such wide range of industrial applications this phenomenon has been under investigation for many years, both for pure fluids and for complex fluids.…”

Section: Introductionmentioning

confidence: 99%

“…Because of such wide range of industrial applications this phenomenon has been under investigation for many years, both for pure fluids and for complex fluids. The studies encompass different conditions: constant pressure and temperature, elevated pressure, fast compression, still gas atmosphere and turbulent reacting flows, strongly and weakly pinning substrates [1,2]. The experimental, theoretical and computer simulation studies carried out so far [1][2][3][18][19][20][21][22][23][24][25][26][27] have taken into account different physical processes: heat transfer inside droplets, mass diffusion in bi-and multicomponent fluids, droplet interactions in sprays, turbulence, radiation absorption, thermal conductivity of the solid substrate, Marangoni convection inside the droplets.…”

Section: Introductionmentioning

confidence: 99%

“…Based on [1,[27][28] one can summarize results for the evaporation of a drop of a pure fluid onto a smooth surface under partial wetting conditions: a) If droplet is big enough [29,30] then the evaporation is limited by vapour diffusion into surrounding air and the evaporation rate is proportional to the radius of the droplet base, L.…”

Section: Introductionmentioning

confidence: 99%

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Evaporation of Droplets of Surfactant Solutions

Semenov

Trybała

Agogo³

et al. 2013

Langmuir

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The simultaneous spreading and evaporation of droplets of aqueous trisiloxane (superspreader) solutions onto a hydrophobic substrate has been studied both experimentally, using a video-microscopy technique, and theoretically. The experiments have been carried out over a wide range of surfactant concentration, temperature and relative humidity. Similar to pure liquids, four different stages have been observed: the initial one corresponds to spreading till the contact angle, θ, reaches the value of the static advancing contact angle, θad. Duration of this stage is rather short and the evaporation during this stage can be neglected. The evaporation is essential during next three stages.The next stage after the spreading, which is referred to below as the first stage, takes place at constant perimeter and ends when θ reaches the static receding contact angle, θr. During the next, second stage, the perimeter decreases at constant contact angle θ=θr for surfactant concentration above critical wetting concentration (CWC). The static receding contact angle decreases during the second stage for concentrations below CWC because the concentration increases due to the evaporation. During the final stage both the perimeter and the contact angle decrease till the drop disappears. Below we consider only the longest stages one and two.The developed theory predicts universal curves for the contact angle dependency on time during the first stage, and for the droplet perimeter on time during the second stage. A very good agreement between theory and experimental data has been found for the first stage of evaporation, and for the second stage for concentrations above CWC, however, some deviations were found for concentrations below CWC.3

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaporation of Droplets of Surfactant Solutions

Semenov

Trybała

Agogo³

et al. 2013

Langmuir

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show abstract

“…Recently a considerable progress in theoretical and experimental studies of simultaneous spreading and evaporation of liquid droplets on solid substrates has been achieved [47,48,49,50,51,52,53,54] in the case of both complete wetting [47] and partial wetting [48,49,50,51]. A universal behavior has been predicted and experimentally verified for both cases.…”

Section: Stages Of Evaporation: Universal Behaviourmentioning

confidence: 93%

Smart and green interfaces: From single bubbles/drops to industrial environmental and biomedical applications

Dutschk

Karapantsios

Liggieri

et al. 2014

Advances in Colloid and Interface Science

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Interfaces can be called Smart and Green (S&G) when tailored such that the required technologies can be implemented with high efficiency, adaptability and selectivity. At the same time they have also to be eco-friendly, i.e. products must be biodegradable, reusable or simply more durable. Bubble and drop interfaces are in many of these smart technologies the fundamental entities and help develop smart products of the everyday life.Significant improvements of these processes and products can be achieved by implementing and manipulating specific properties of these interfaces in a simple and smart way, in order to accomplish specific tasks. The severe environmental issues require in addition attributing ecofriendly features to these interfaces, by incorporating innovative , or, sometime, recycle materials and conceiving new production processes which minimize the use of natural resources and energy. Such concept can be extended to include important societal challenges related to support a sustainable development and a healthy population.The achievement of such ambitious targets requires the technology research to be supported by a robust development of theoretical and experimental tools, needed to understand in more details the behavior of complex interfaces. A wide but not exhaustive review of recent work concerned with green and smart interfaces is presented, addressing different scientific and technological fields. The presented approaches reveal a huge potential in relation to various technological fields, such as nanotechnologies, biotechnologies, medical diagnostics, new or improved materials.

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Evaporative characteristics of sessile nanofluid droplet on micro‐structured heated surface

et al. 2018

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Micro‐structure patterned substrates attract our attention due to the special and programmable wettabilities. The interaction between the liquid and micro/nano structures gives rise to controllable spreading and thus evaporation. For exploration of the application versatility, the introduction of nanoparticles in liquid droplet results in interaction among particles, liquid and microstructures. In addition, temperature of the substrates strongly affects the spreading of the contact line and the evaporative property. The evaporation of sessile droplets of nanofluids on a micro‐grooved solid surface is investigated in terms of liquid and surface properties. The patterned nickel surface used in the experiments is designed and fabricated with circular and rectangular shaped pillars whose size ratios between interval and pillars is fixed at 5. The behavior is firstly compared between nanofluid and pure liquid on substrates at room temperature. For pure water droplet, the drying time is relatively longer due to the receding of contact line which slows down the liquid evaporation. Higher concentrations of nanoparticles tend to increase the total evaporation time. With varying concentrations of graphite at nano scale from 0.02% to 0.18% with an interval at 0.04% in water droplets and the heating temperature from 22 to 85°C, the wetting and evaporation of the sessile droplets are systematically studied with discussion on the impact parameters and the resulted liquid dynamics as well as the stain. The interaction among the phases together with the heating strongly affects the internal circulation inside the droplet, the evaporative rate and the pattern of particles deposition.

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Droplets evaporation: Problems and solutions

Cited by 65 publications

References 90 publications

Evaporation of Droplets of Surfactant Solutions

Evaporation of Droplets of Surfactant Solutions

Smart and green interfaces: From single bubbles/drops to industrial environmental and biomedical applications

Evaporative characteristics of sessile nanofluid droplet on micro‐structured heated surface

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