Evaporation of water/ethanol droplets in an air flow: Experimental study and modelling

Starinskaya, Elena; Miskiv, N. B.; Назаров, А. Д.; Терехов, В. И.; Rybdylova, Oyuna; Sazhin, Sergei

doi:10.1016/j.ijheatmasstransfer.2021.121502

Cited by 26 publications

(17 citation statements)

References 29 publications

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“…Calculations were performed until the mass fractions of nanoparticles at the droplet surface reached 0.4 when the formation of the cenosphere-like structure at the surface of the droplet was observed. As expected, both experimentally observed and predicted (d/d 0 ) 1.5 are almost linear functions of time except at the very initial stage (heat-up period) and the final stage of evaporation of droplets for an initial mass fraction of nanoparticles of 7% (we refer to [49] for a detailed discussion of the linear behaviour of this curve).…”

Section: Modelling Versus Experimental Datasupporting

confidence: 75%

“…The low thermal conductivity of the supporting thread allows us to assume, following [48], that T sup = T s , where T s is the droplet surface temperature. This approach to considering the effect of the supporting thread is more accurate than the one used in [49] where T sup was identified with the ambient gas temperature.…”

Section: Description Of Models and Approximationsmentioning

confidence: 99%

“…The transport and thermodynamic properties of distilled water and their temperature dependencies used in our analysis are described in [49]. The following parameters for SiO 2 nanoparticles were used: density ρ p = 2330 kg/m 3 , thermal conductivity k p = 1.4 W/(m K), and specific heat capacity c p = 783 J/(kg K).…”

Section: Transport and Thermodynamic Propertiesmentioning

confidence: 99%

“…As in [49], our focus is on droplet surface temperatures (T s ) and their diameters (d). Since all experiments were performed for droplets with initial temperatures equal to the ambient gas temperatures (T g ), which remained almost constant during the experiments, we will present the results for T g − T s rather than for T s .…”

Section: Modelling Versus Experimental Datamentioning

confidence: 99%

“…This approach will allow us to show more clearly the conditions in which droplet evaporation takes place. Following [49,58], we focus on the time evolution of (d/d 0 ) 1.5 , where d 0 is the initial droplet diameter, which is expected to be an almost linear function of time.…”

Section: Modelling Versus Experimental Datamentioning

confidence: 99%

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Evaporation of Suspended Nanofluid (SiO$$_{2}$$/Water) Droplets: Experimental Results and Modelling

et al. 2023

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The results of experimental studies and modelling of the evaporation of suspended water droplets containing silicon dioxide SiO2 nanoparticles at mass fractions 0.02 and 0.07 are presented. The experimental results are analysed using the previously developed model for multicomponent droplet heating and evaporation. In this model droplets are assumed to be spherical and the analytical solutions to the heat transfer and species diffusion equations are incorporated into the numerical code. They are used at each timestep of the calculations. Silicon dioxide nanoparticles are considered to be a non-evaporating component. It is demonstrated that both experimental and predicted values of droplet diameters to the power 1.5 decrease almost linearly with time, except at the beginning and the final stages of the evaporation process, and are only weakly affected by the presence of nanoparticles. At the final point in this process, the effect of nanoparticles becomes dominant when their mass fraction at Evaporation of suspended nanofluid (SiO 2 /water) droplets the droplet surface reaches about 40% and a cenosphere-like structure is formed. Both predicted and observed droplet surface temperatures rapidly decrease during the initial stage of droplet evaporation. After about t = 100 s the predicted surface temperature remains almost constant while its experimentally observed values increase with time. This might be related to a decrease in the temperature of ambient air in the vicinity of droplets, not taken into account in the model. Both observed and predicted values of the mass fraction of silicon dioxide at the droplet surfaces are shown to increase with time until they reach about 0.4.

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Section: Modelling Versus Experimental Datasupporting

confidence: 75%

Section: Description Of Models and Approximationsmentioning

confidence: 99%

Section: Transport and Thermodynamic Propertiesmentioning

confidence: 99%

Section: Modelling Versus Experimental Datamentioning

confidence: 99%

Section: Modelling Versus Experimental Datamentioning

confidence: 99%

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Evaporation of Suspended Nanofluid (SiO$$_{2}$$/Water) Droplets: Experimental Results and Modelling

et al. 2023

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Two‐phase modeling of evaporation characteristics of ethanol droplet under force‐convection environment

2023

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Studies on the evaporation phenomenon of a pure ethanol droplet have been mostly confined to the semianalytical modeling in stagnant ambient. Investigation into this aspect in a convective environment by considering the Navier–Stokes equation is also minimal. Hence, in this study we analyze and investigate the evaporation characteristics of a single‐component spherical‐shaped isolated pure ethanol droplet under force convective air environment by considering both gas‐ and liquid‐phase motions, nonunitary Lewis number in the interface, variable Stefan flow (blowing) effect, and the transient droplet heating. The finite difference method is utilized while solving the governing equations of the spherical polar coordinate system for species, momentum, and energy transfer. The maximum Reynolds number and ambient temperature are kept at 100 and 600 K, respectively. The present work is validated by comparing the normalized surface regression curve of the droplet with the earlier experimental and theoretical results. Using the current simulated data, flow and temperature profiles of both gas and liquid regions are visualized in streamline and isotherm contour plots at various instants of time. It is observed that at a moderate Reynolds number a detached vortex forms at the downstream location of the droplet. However, the detachment length increases with time. The temperature gradients along the droplet surface are observed at the initial stage. Moreover, the heat‐up period occupies about 20% of the total lifetime of the droplet. The droplet life and heat‐up period decrease with an increase in free‐stream velocity. In addition, the saturation temperature increases with ambient temperature.

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Heating and Evaporation of Mono-component Droplets

Sazhin

2022

Droplets and Sprays: Simple Models of Complex Processes

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Evaporation of water/ethanol droplets in an air flow: Experimental study and modelling

Cited by 26 publications

References 29 publications

Evaporation of Suspended Nanofluid (SiO$$_{2}$$/Water) Droplets: Experimental Results and Modelling

Evaporation of Suspended Nanofluid (SiO$$_{2}$$/Water) Droplets: Experimental Results and Modelling

Two‐phase modeling of evaporation characteristics of ethanol droplet under force‐convection environment

Heating and Evaporation of Mono-component Droplets

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