Numerical investigation on the evaporation of droplets depositing on heated surfaces at low Weber numbers

Strotos, George; Gavaises, Manolis; Theodorakakos, A.; Bergeles, G.

doi:10.1016/j.ijheatmasstransfer.2007.07.045

Cited by 88 publications

(39 citation statements)

References 40 publications

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“…Evaporation/condensation rates based on a simple diffusive approximation are used in Schlottke and Weigand (2008) and Eisenschmidt et al (2016), whereas linearized jump formulas, compatible with kinetic theory formulation are proposed in Hardt and Wondra (2008), in combination with a VoF scheme modified to allow mass, momentum and energy transfer between the vapor and liquid phases. In Strotos et al (2008), various expressions for the evaporation mass flow rate were considered in the study of droplet depositing on a heated surface by VoF as well as by simplified droplet models. Unfortunately, the chosen kinetic model was based on Hertz-Knudsen formula which oversimplifies the kinetic layer structure by neglecting the effects of vapor advection and molecular back-scatter (Ytrehus, 1997).…”

Section: A Summary Of Computational Techniques For Two-phase Flows Anmentioning

confidence: 99%

Kinetic theory aspects of non-equilibrium liquid-vapor flows

Frezzotti

Barbante

2017

Mechanical Engineering Reviews

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Kinetic theory of fluids plays an important role in understanding and modeling mass, momentum and energy transfer between the vapor and liquid phase in non-equilibrium two-phase flows, in which evaporation and/or condensation take place. The paper presents a review of the literature which focuses on kinetic modeling of the vapor-liquid interface. Starting from the studies of the Knudsen layer structure in evaporation and condensation, the problem of the formulation of kinetic boundary conditions is described and discussed. The formulation of models based on approximate kinetic descriptions of dense fluids is described and the model capabilities are assessed through the analysis of the results obtained by various authors.

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Section: A Summary Of Computational Techniques For Two-phase Flows Anmentioning

confidence: 99%

Kinetic theory aspects of non-equilibrium liquid-vapor flows

Frezzotti

Barbante

2017

Mechanical Engineering Reviews

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“…Symulację przeprowadzono dla średniego czasu formowania się kształtu kropli wody na powierzchni ciała stałego, dochodzącego do 25 ms [11]. Po tym czasie w większości przypadków tempo parowania kropli jest stałe.…”

Section: Wyniki Symulacjiunclassified

Dynamika procesu parowania pojedynczej kropli wody przy małych liczbach Webera

Smakulski

Pietrowicz

2015

ZN PRz Mechanika

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“…Marangoni flow, is considered, while the effects of natural convection are considered negligible. Strotos et al [10] simultaneously studied the coupled fluid flow and heat transfer of a droplet, substrate and surroundings using volume of fluids (VOF). The model was compared to a simplified numerical approximation neglecting the internal flow, and the advanced model was found to give the best prediction when compared to experiments.…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer boundary conditions at the surface of a heated sessile droplet

Ljung

Lundström

2017

Heat Mass Transfer

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This work numerically investigates how the boundary conditions of a heated sessile water droplet should be defined in order to include effects of both ambient and internal flow. Significance of water vapor, Marangoni convection, separate simulations of the external and internal flow, and influence of contact angle throughout drying is studied. The quasisteady simulations are carried out with Computational Fluid Dynamics and conduction, natural convection and Marangoni convection are accounted for inside the droplet. For the studied conditions, a noticeable effect of buoyancy due to evaporation is observed. Hence, the inclusion of moisture increases the maximum velocities in the external flow. Marangoni convection will, in its turn, increase the velocity within the droplet with up to three orders of magnitude. Results furthermore show that the internal and ambient flow can be simulated separately for the conditions studied, and the accuracy is improved if the internal temperature gradient is low, e.g. if Marangoni convection is present. Simultaneous simulations of the domains are however preferred at high plate temperatures if both internal and external flows are dominated by buoyancy and natural convection. The importance of a spatially resolved heat and mass transfer boundary condition is, in its turn, increased if the internal velocity is small or if there is a large variation of the transfer coefficients at the surface. Finally, the results indicate that when the internal convective heat transport is small, a rather constant evaporation rate may be obtained throughout the drying at certain conditions.

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Numerical investigation on the evaporation of droplets depositing on heated surfaces at low Weber numbers

Abstract: Numerical investigation on the evaporation of droplets depositing on heated surfaces at low Weber numbers.

Cited by 88 publications

References 40 publications

Kinetic theory aspects of non-equilibrium liquid-vapor flows

Kinetic theory aspects of non-equilibrium liquid-vapor flows

Dynamika procesu parowania pojedynczej kropli wody przy małych liczbach Webera

Heat and mass transfer boundary conditions at the surface of a heated sessile droplet

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