Computational fluid dynamics model of rhythmic motion of charged droplets between parallel electrodes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F17%3A43913822" target="_blank" >RIV/60461373:22340/17:43913822 - isvavai.cz</a>

Result on the web

<a href="https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/computational-fluid-dynamics-model-of-rhythmic-motion-of-charged-droplets-between-parallel-electrodes/453956C175E955F82510EEC1010B820E" target="_blank" >https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/computational-fluid-dynamics-model-of-rhythmic-motion-of-charged-droplets-between-parallel-electrodes/453956C175E955F82510EEC1010B820E</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/jfm.2017.230" target="_blank" >10.1017/jfm.2017.230</a>

Result language

angličtina

Original language name

Computational fluid dynamics model of rhythmic motion of charged droplets between parallel electrodes

Original language description

A mathematical electrodes is developed in this study. The work is motivated by recent experimental findings that report oscillatory behaviour of water in oil droplets under a direct current electric field. The model considers the presence of a charged droplet placed in a dielectric medium. The droplet is immediately attracted to the electrode with the opposite polarity. When approaching the electrode, the electric charge is electrochemically reversed within the droplet, which is then repelled to the other electrode. The entire process can periodically repeat. The model is able to track a deformable liquid-liquid interface, the dynamics of the wetting process at the electrodes and the dynamics of electrochemical charge transfer between the droplet and the electrodes. The dependences of the oscillation frequency, charge acquired by the droplet and charging time on several model parameters (surface charge density on electrodes, kinetic parameter of charging, droplet-electrode contact angle, droplet size, liquid permittivity) are examined. Qualitative agreement of the model predictions with available experimental data is obtained, e.g. the oscillation frequency increases with growing electric field strength or droplet size. Our model represents the first successful attempt to predict oscillatory motion of aqueous droplets by a pseudo-three-dimensional two-phase approach. Our model also strongly supports the theory that the oscillatory motion relies on the combination of electrochemical charge injection at the electrodes and electrostatic attraction/repulsion processes.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20402 - Chemical process engineering

Project

<a href="/en/project/GA14-01781S" target="_blank" >GA14-01781S: Investigation on fluid mechanics in smart microsystems driven by electric fields</a><br>

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Fluid Mechanics

ISSN

0022-1120

e-ISSN

—

Volume of the periodical

822

Issue of the periodical within the volume

7

Country of publishing house

GB - UNITED KINGDOM

Number of pages

23

Pages from-to

31-53

UT code for WoS article

000403090300008

EID of the result in the Scopus database

2-s2.0-85020278225