Vertical oscillations of droplets in small droplet clusters

Alexander A. Fedorets; Dmitrii N. Gabyshev; Dmitrii Shcherbakov; Edward Bormashenko; Leonid A. Dombrovsky; Michael Nosonovsky

doi:10.1016/j.colsurfa.2021.127271

Vertical oscillations of droplets in small droplet clusters

Alexander A. Fedorets, Dmitrii N. Gabyshev, Dmitrii Shcherbakov, Edward Bormashenko, Leonid A. Dombrovsky, Michael Nosonovsky

Department of Chemical Engineering

Ariel University

Research output: Contribution to journal › Article › peer-review

Abstract

Small clusters of condensed microdroplets can levitate above a heated water surface. Vertical oscillations of small clusters (one, two, and three droplets) in the frequency range below 90 Hz are studied and compared with recently reported horizontal oscillations. Two reproducible peak frequencies are at 41.6 ± 0.4 Hz and at 49.5 ± 0.2 Hz. These frequencies are much higher than those for horizontal oscillations (between 1.61 Hz and 5.96 Hz); however, corresponding amplitudes are much smaller, which suggests equal energy distributions between the degrees of freedom. The values of effective stiffness constants are obtained from the data on equilibrium height of levitation of droplets of different sizes, and possible sources of oscillations are discussed. The oscillations are caused by aerodynamic forces, and these are same forces which are responsible for the stability of the droplet cluster.

Original language	English
Article number	127271
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	628
DOIs	https://doi.org/10.1016/j.colsurfa.2021.127271
State	Published - 5 Nov 2021

Keywords

Droplet cluster
Droplet oscillations
Gas flow instability
Self-assembly

All Science Journal Classification (ASJC) codes

Surfaces and Interfaces
Physical and Theoretical Chemistry
Colloid and Surface Chemistry

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10.1016/j.colsurfa.2021.127271

Cite this

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title = "Vertical oscillations of droplets in small droplet clusters",

abstract = "Small clusters of condensed microdroplets can levitate above a heated water surface. Vertical oscillations of small clusters (one, two, and three droplets) in the frequency range below 90 Hz are studied and compared with recently reported horizontal oscillations. Two reproducible peak frequencies are at 41.6 ± 0.4 Hz and at 49.5 ± 0.2 Hz. These frequencies are much higher than those for horizontal oscillations (between 1.61 Hz and 5.96 Hz); however, corresponding amplitudes are much smaller, which suggests equal energy distributions between the degrees of freedom. The values of effective stiffness constants are obtained from the data on equilibrium height of levitation of droplets of different sizes, and possible sources of oscillations are discussed. The oscillations are caused by aerodynamic forces, and these are same forces which are responsible for the stability of the droplet cluster.",

keywords = "Droplet cluster, Droplet oscillations, Gas flow instability, Self-assembly",

author = "Fedorets, {Alexander A.} and Gabyshev, {Dmitrii N.} and Dmitrii Shcherbakov and Edward Bormashenko and Dombrovsky, {Leonid A.} and Michael Nosonovsky",

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doi = "10.1016/j.colsurfa.2021.127271",

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publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Vertical oscillations of droplets in small droplet clusters

AU - Fedorets, Alexander A.

AU - Gabyshev, Dmitrii N.

AU - Shcherbakov, Dmitrii

AU - Bormashenko, Edward

AU - Dombrovsky, Leonid A.

AU - Nosonovsky, Michael

PY - 2021/11/5

Y1 - 2021/11/5

N2 - Small clusters of condensed microdroplets can levitate above a heated water surface. Vertical oscillations of small clusters (one, two, and three droplets) in the frequency range below 90 Hz are studied and compared with recently reported horizontal oscillations. Two reproducible peak frequencies are at 41.6 ± 0.4 Hz and at 49.5 ± 0.2 Hz. These frequencies are much higher than those for horizontal oscillations (between 1.61 Hz and 5.96 Hz); however, corresponding amplitudes are much smaller, which suggests equal energy distributions between the degrees of freedom. The values of effective stiffness constants are obtained from the data on equilibrium height of levitation of droplets of different sizes, and possible sources of oscillations are discussed. The oscillations are caused by aerodynamic forces, and these are same forces which are responsible for the stability of the droplet cluster.

AB - Small clusters of condensed microdroplets can levitate above a heated water surface. Vertical oscillations of small clusters (one, two, and three droplets) in the frequency range below 90 Hz are studied and compared with recently reported horizontal oscillations. Two reproducible peak frequencies are at 41.6 ± 0.4 Hz and at 49.5 ± 0.2 Hz. These frequencies are much higher than those for horizontal oscillations (between 1.61 Hz and 5.96 Hz); however, corresponding amplitudes are much smaller, which suggests equal energy distributions between the degrees of freedom. The values of effective stiffness constants are obtained from the data on equilibrium height of levitation of droplets of different sizes, and possible sources of oscillations are discussed. The oscillations are caused by aerodynamic forces, and these are same forces which are responsible for the stability of the droplet cluster.

KW - Droplet cluster

KW - Droplet oscillations

KW - Gas flow instability

KW - Self-assembly

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U2 - 10.1016/j.colsurfa.2021.127271

DO - 10.1016/j.colsurfa.2021.127271

M3 - مقالة

SN - 0927-7757

VL - 628

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

M1 - 127271

ER -

Vertical oscillations of droplets in small droplet clusters

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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