Levitation conditions for condensing droplets over heated liquid surfaces

We report experimental studies and develop mathematical models of levitation of microscale droplets over an evaporating liquid layer. The maximum size of droplets is estimated from the balance between gravity and Stokes force due to the action of upward Stefan flow generated by evaporation. Mathemat...

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Published inSoft matter Vol. 17; no. 17; pp. 4623 - 4631
Main Authors Zaitsev, Dmitry V, Kirichenko, Dmitry P, Kabov, Oleg A, Ajaev, Vladimir S
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 05.05.2021
Subjects
Computational fluid dynamics
Droplets
Evaporation
Flow velocity
Levitation
Liquid surfaces
Mathematical analysis
Mathematical models
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Summary:We report experimental studies and develop mathematical models of levitation of microscale droplets over an evaporating liquid layer. The maximum size of droplets is estimated from the balance between gravity and Stokes force due to the action of upward Stefan flow generated by evaporation. Mathematical models of diffusion around levitating droplets allow us to determine Stefan flow velocity at the liquid layer surface. These results are then used to determine the dependence of levitation height on droplet size. Experimental data for a range of conditions are shown to collapse onto a single curve predicted from the model. We report experimental studies of levitation of microdroplets over evaporating liquid layer and show that all data for levitation height as a function of droplet size represented in nondimensional form collapses onto a single curve obtained from mathematical modeling.
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ISSN:1744-683X
1744-6848
DOI:10.1039/d0sm02185g