Oscillatory Motion of Microdroplets of a Droplet Cluster in a Linearly Nonuniform Electric Field

Andreev, S. N.; Gabyshev, D. N.

doi:10.3103/s1068335618090014

Cited by 7 publications

(4 citation statements)

References 5 publications

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“…In an external electric field, the cluster lifetime reduces due to electrokinetic forces that tend to disrupt the cluster's mechanical equilibrium (Gabyshev 2018;Andreev and Gabyshev 2018). Therefore, in earlier experiments, the voltage at the upper electrode did not exceed 700 V (Gabyshev et al 2019;Fedorets et al 2019b;Fedorets et al 2020).…”

Section: Electric Fieldsmentioning

confidence: 84%

Condensational growth of water droplets in an external electric field at different temperatures

Gabyshev

Fedorets

Klemm

2020

Aerosol Science and Technology

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The condensational growth of water droplets in technical and natural systems varies with environmental conditions such as droplet size, droplet composition, air humidity, temperature, and turbulence. This contribution addresses the influence of external electrical fields on the condensation process. Although electrical fields exist in the atmosphere, for example in thunderstorm clouds, and although it is generally accepted that electrical fields exert an influence on the condensation process, no quantitative description of this influence at ambient temperatures exists. We present laboratory experiments and a theoretical model to further develop understanding of the influence of electric fields on condensation at various temperatures. The levitated droplet cluster technology is applied to study the kinetics of droplet growth in an external electric field at temperatures between 50 C and 70 C. The theoretical model is designed to mirror the experimental conditions as precisely as possible. Experimental and kinetic model results are in qualitative agreement in that the relative contribution of the electrically induced contribution to total condensation reduces with increasing temperature. Vice versa, the electrically induced condensation significance is expected to further increase with decreasing temperatures below 50 C. We expect that electrocondensation will be the dominating process at room temperatures and even more at temperatures near 0 C, at electric field strengths typical for clouds. Further studies are needed to extend the experimental and theoretical temperature range to conditions typical for clouds in the atmosphere.

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Section: Electric Fieldsmentioning

confidence: 84%

Condensational growth of water droplets in an external electric field at different temperatures

Gabyshev

Fedorets

Klemm

2020

Aerosol Science and Technology

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“…Мисиюк зазоре (H − R) сила обращается в бесконечность, хотя в реальных экспериментах наблюдается коалесценция. Поэтому в [49,50] формула (14) частично корректировалась поправочными коэффициентами, рассчитанными по ранее опубликованным экспериментальным зависимостям H от R [18].…”

Section: Discussionunclassified

Динамика Капель, Подброшенных Над Испаряющейся Поверхностью Воды

Gabyshev¹,

Медведев²,

Misiiuk

2021

Журнал Технической Физики

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The data of a ballistic experiment are analyzed, in which an intense capillary wave injects up microdroplets formed and levitated above a heated region of water due to an ascending convective steam-air flow. The drag force resisting the movement of a droplet is estimated. Using various theoretical approaches, the flow parameters (velocity at different heights, the rate of change of velocity) are estimated. The maximum size of droplets that can levitate freely has been determined. The impossibility of the stationary droplet levitation in a linearly inhomogeneous flow is shown.

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“…Droplet clusters are characterized by some permanent wobble motion, just as the aforementioned particles in the levitators. In our previous studies, we introduced the issue of mechanical oscillations for both vertical [49,50] and planar horizontal components [51,52] of the droplet cluster motion. The close observation of tracer particles revealed vortexes beneath the droplet clusters [53].…”

Section: Current State Of Researchmentioning

confidence: 99%

Oscillatory Signatures in the Raindrop Motion Relative to the Air Medium with Terminal Velocity

et al. 2022

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This paper aims to study the path oscillations of single, spherical water droplets levitated in a wind tunnel to better comprehend the mechanical motion of small raindrops. The observations were carried out in the Mainz vertical wind tunnel. The discrete, fast Fourier transform was used to determine the oscillatory frequencies of the droplet paths, and the Hilbert transform was applied to analyze their instantaneous frequency stability. Both transversal and streamwise components of the path oscillations are described with typical frequencies of several tens of Hertz. The studied oscillations elongate the paths, reduce the terminal velocity of the smallest droplets, and make the rain droplet fall in a non-uniform motion even after reaching terminal velocity. The terminal velocity can be considered as physically having been reached if our proposed practical criterion is satisfied. From a fluid mechanics perspective, the paper fills an experimental gap in the studies of the paths oscillations of single, liquid spheres of microscopic sizes at low Bond numbers <1 and relatively low Reynolds numbers ~102.

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Oscillatory Motion of Microdroplets of a Droplet Cluster in a Linearly Nonuniform Electric Field

Cited by 7 publications

References 5 publications

Condensational growth of water droplets in an external electric field at different temperatures

Condensational growth of water droplets in an external electric field at different temperatures

Динамика Капель, Подброшенных Над Испаряющейся Поверхностью Воды

Oscillatory Signatures in the Raindrop Motion Relative to the Air Medium with Terminal Velocity

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