EFFECT OF SiO2 NANOPARTICLE ADDITION ON THE EVAPORATION OF A SUSPENDED WATER DROPLET

Starinskaya, Elena; Назаров, А. Д.; Miskiv, N. B.; Starinskiy, S. V.

doi:10.1615/heattransres.2022041024

Cited by 7 publications

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“…The choice of mass fractions of nanoparticles was motivated by our intention to investigate the effect of a high concentration of nanoparticles on the nanofluid droplet evaporation process, including the formation of the cenosphere-like structure during their evaporation. This study is complementary to the previous investigation where the effect of low mass fraction (0.1%) of these particles was investigated [35]. The initial mass fractions of nanoparticles 0.02 and 0.07 were chosen based on the observation that for these values their agglomeration was not observed until the final stage of the drying process when the cenosphere-like structure was formed.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2023

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The Experimental Study of Evaporation of Water and Nanofluid Droplets on the Surfaces of Materials with Different Thermal Conductivities

Sterlyagov

Низовцев

2023

Colloid J

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Evaporation Heat Transfer of Single Hydrous Ethanol Droplet Impacting on a Heated Wall

et al. 2023

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The phenomenon of droplet impact on heated wall along with its evaporation is encountered in a variety of scenarios in industrial production. The present work aims to experimentally study the evaporation heat transfer of single hydrous ethanol droplet impact on a heated wall at saturation temperature under lower velocity. Its dynamic evolution after the impact, along with the stable adhesion morphology, was studied at different wall temperatures. The characteristics of its heat transfer and evaporation were analyzed by focusing on the effects of wall temperature, ethanol concentration, and adhesion morphology. The results show that the wall temperature has little effect on the spreading time, but significant on the spreading area and retraction. The "pining effect" of the hydrous ethanol weakens with the ethanol concentration, until it completely disappears. The film thickness along with its contact angle in adhesion evaporation shows a linear decrease accompanied by oscillations at the later stage. Evaporation heat transfer rate gradually increases with the wall temperature and ethanol concentration, and shows a multiple power function with them. The saturation temperature in evaporation gradually increases with the wall temperature, while the ethanol concentration has a minor effect. The average heat flux in evaporation can reach the magnitude of 10E5, and increases with the wall temperature and ethanol concentration.

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EFFECT OF SiO2 NANOPARTICLE ADDITION ON THE EVAPORATION OF A SUSPENDED WATER DROPLET

Cited by 7 publications

References 0 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

The Experimental Study of Evaporation of Water and Nanofluid Droplets on the Surfaces of Materials with Different Thermal Conductivities

Evaporation Heat Transfer of Single Hydrous Ethanol Droplet Impacting on a Heated Wall

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