Fluid viscosity and corresponding effects on fluid flow, velocity magnitude and electric field distribution in electrohydrodynamic jetting.

Babatunde Aramide, Suwan Jayasinghe, Yiannis Ventikos

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

1 Citation (Scopus)

Abstract

The phenomenon of electrohydrodynamic (EHD) jetting is affected by both the flow and electric properties of the dielectric fluid. A computational fluid dynamics (CFD) approach has been used to analyse the resultant effect of fluid viscosity on EHD flows. This study looks at the unique effect of fluid viscosity on the flow profile, velocity magnitude and the electric field distribution. It is very difficult to experimentally study these relationships, but CFD provides insights that can open the world of Electrohydrodynamics to new levels of applications; as this will give an idea of how to manipulate the jet formation. Viscosity has been highlighted as one of the key parameters that aid jet elongation and stability. Therefore, the necessity to study its role. Most studies have been carried out experimentally, but this paper provides computation insights. To solve the multiphase problem, a finite volume method using the Volume of Fluid approach for capturing the shape of the interface was used for the investigation. The leaky dielectric model which describes the process solves the combination of the Charge Transport Model and Navier-Stokes equations simultaneously. The transient liquid-gas interface tracking was achieved using the VOF technique. Among many other features observed, the results showed that it takes more time for the electric field to overcome the opposing surface tension of the solution at higher viscosity than at lower viscosity. Higher electric field magnitudes/strength were observed for the fluid of lower viscosity than that of the higher viscosity. Also, an increase in the viscosity reduces the droplet size/jet diameter.

Original languageEnglish
Title of host publicationElectrostatics 2019 and Dielectrics 2019
PublisherIOP Publishing
Volume1322
Edition1
DOIs
Publication statusPublished - 2019
Externally publishedYes
EventJoint Conference on Electrostatics 2019 - Manchester, United Kingdom
Duration: 8 Apr 201912 Apr 2019
https://iopscience.iop.org/issue/1742-6596/1322/1 (Proceedings)

Publication series

NameJournal of Physics: Conference Series
PublisherIOP Publishing
ISSN (Print)1742-6588

Conference

ConferenceJoint Conference on Electrostatics 2019
Country/TerritoryUnited Kingdom
CityManchester
Period8/04/1912/04/19
Internet address

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