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Interfacial Phenomena and Heat Transfer

Publicou 4 edições por ano

ISSN Imprimir: 2169-2785

ISSN On-line: 2167-857X

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EXPERIMENTAL AND THEORETICAL STUDIES OF ORDERED ARRAYS OF MICRODROPLETS LEVITATING OVER LIQUID AND SOLID SURFACES

Volume 6, Edição 3, 2018, pp. 219-230
DOI: 10.1615/InterfacPhenomHeatTransfer.2019029816
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Dmitry V. Zaitsev
Kutateladze Institute of Thermophysics SB RAS, 1, Lavrentiev Ave, Novosibirsk, 630090, Russia; Novosibirsk State University, 2, Pirogova str., Novosibirsk, 630090, Russia
Dmitry P. Kirichenko
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, 630090, Russia; Novosibirsk State University, Novosibirsk, 630090, Russia
Almira I. Shatekova
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, 630090, Russia; Novosibirsk State University, Novosibirsk, 630090, Russia
Vladimir S. Ajaev
Department of Mathematics, Clements Hall, Southern Methodist University, Dallas, TX, 75275, USA
Oleg A. Kabov
Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences, 1, Acad. Lavrentyev Ave., Novosibirsk, 630090, Russia; Novosibirsk State University, 2, Pirogova str., Novosibirsk, 630090, Russia; Novosibirsk State Technical University, 20 Prospect K. Marksa, Novosibirsk, 630073, Russia

RESUMO

Levitating droplets of liquid condensate are known to organize themselves into ordered arrays over hot liquid-gas interfaces. The mechanism of levitation is the Stokes drag force acting onto a drop from the flow originated at the interface. We report experimental observation of levitation and self-organization of liquid microdroplets (with the size on the order of 10 µm) over both hot liquid-gas interfaces and heated dry solid surfaces. In the experiment a copper block heated from below is used as the substrate. Degassed ultra-pure water is used as the working liquid. Optical recording is made using a high-speed camera equipped with a microscope objective of high resolving power. Working liquid is deposited with a syringe onto the substrate to form a horizontal liquid layer. The heater is then switched on, resulting in evaporation and formation of ordered droplet array levitating over liquid surface. With a short pulse of air jet a dry spot is formed on the copper surface. When the array moves to the dry spot, the droplets continue to levitate over the solid dry surface. Even though the life-time of the array is shorter over the dry surface, its geometric characteristics are similar. Mathematical models are developed that explain droplet levitation for both configurations and lead to new power laws for the levitation height as a function of droplet size. The predictions of the models are in good agreement with the experimental data.

Palavras-chave: microdroplets, structured arrays, levitation, Stefan flow, Leidenfrost effect, micro scale measurement
CITADO POR

  1. Yeh , Wu , Huang , Lee , Jeng , In Search of a Green Process: Polymeric Films with Ordered Arrays via a Water Droplet Technique, Polymers, 11, 9, 2019. Crossref

  2. Shatekova A. I., Zaitsev D. V., Interdroplet distance in a 2D ordered array of microdroplets levitating over a heated liquid layer, THERMOPHYSICAL BASIS OF ENERGY TECHNOLOGIES (TBET 2019), 2212, 2020. Crossref

  3. Ajaev Vladimir S., Zaitsev Dmitry V., Kabov Oleg A., Levitation of evaporating microscale droplets over solid surfaces, Physical Review Fluids, 6, 5, 2021. Crossref

  4. Kunts K A, Zaitsev D V, Kabov O A, Evaporation of levitating liquid microdroplets over a dry heated surface, Journal of Physics: Conference Series, 2119, 1, 2021. Crossref

  5. Zaitsev D V, Shatekova A I, Investigation of the effect of air humidity on the condensation growth of levitating liquid microdroplets, Journal of Physics: Conference Series, 2119, 1, 2021. Crossref

  6. Zaitsev Dmitry V., Kirichenko Dmitry P., Kabov Oleg A., Ajaev Vladimir S., Levitation conditions for condensing droplets over heated liquid surfaces, Soft Matter, 17, 17, 2021. Crossref

  7. Kupershtokh A L, An evaporation flux of pure vapor in the method of lattice Boltzmann equations, Journal of Physics: Conference Series, 2057, 1, 2021. Crossref

  8. Antonevich Y V, Zaitsev D V, Kabov O A, Uncertainty of the shadow method for the analysis of evaporating droplets, Journal of Physics: Conference Series, 1675, 1, 2020. Crossref

  9. Kirichenko E O, Kirichenko D P, Zaitsev D V, Investigation of the flight of liquid microdroplets over the contact line in a horizontal liquid film heated from below, Journal of Physics: Conference Series, 2211, 1, 2022. Crossref

  10. Shatekova A I, Condensation growth of microdroplets levitating over a heated liquid film, Journal of Physics: Conference Series, 1677, 1, 2020. Crossref

  11. Zaitsev D V, Shatekova A I, Investigation of structured 2D arrays of microdroplets levitating above the surface of hot liquid, Journal of Physics: Conference Series, 1675, 1, 2020. Crossref

  12. Zaitsev D V, Shatekova A I, Pukhovoy M V, Minimum and maximum size of levitating water droplets above the surface of a heated liquid layer, Journal of Physics: Conference Series, 1867, 1, 2021. Crossref

  13. Fedorets Alexander A., Shcherbakov Dmitry V., Levashov Vladimir Yu, Dombrovsky Leonid A., Self-stabilization of droplet clusters levitating over heated salt water, International Journal of Thermal Sciences, 182, 2022. Crossref

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