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On simulations investigating droplet diameter-charge distributions in electrostatically atomized dielectric liquid sprays

On simulations investigating droplet diameter-charge distributions in electrostatically atomized dielectric liquid sprays
On simulations investigating droplet diameter-charge distributions in electrostatically atomized dielectric liquid sprays
A general procedure has been developed for the simulation of charged liquid and electrostatically atomized sprays. The procedure follows a Lagrangian approach for simulation of spray droplets and an Eulerian approach for gas phase variables, including the electric field generated by the charge presence on droplets. Validation of the procedure was examined through simulations of previously published charged spray experiments. Results showed that for the specification of initial droplet charge, modelling the droplet charge-diameter relationship through a scaling law is as reliable a method as using a directly obtained charge-diameter relationship from experimental measurements. The normalised root-mean-squared errors for sprays using the two methods were shown to be within 12% of one another, for the prediction of spatially averaged profiles of mean droplet diameters, mean axial velocities and mean radial droplet velocities. Results showed that the general spatial characteristics and dynamics of a charged liquid spray can successfully be reproduced, including the axial and radial dispersal pattern of droplets, and the distribution of mean droplet diameters throughout the spray plume. For all sprays with droplet charges defined through a scaling law relationship, the normalised root-mean-squared errors range from 9.0% to 31.6% for mean droplet diameters, 10.4% to 67.9% for mean axial droplet velocities, and 16.8% to 38.6% for mean radial droplet velocities. Lastly, we present a brief set of general recommendations for simulating electrostatically atomized dielectric liquid sprays.
charge injection, electrostatic atomization, charged sprays, cfd
0271-2091
1051-1075
Shrimpton, J.S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Amine-Eddine, G.H.
c6ee3e00-ca44-4f74-9cab-c54484d88593
Shrimpton, J.S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Amine-Eddine, G.H.
c6ee3e00-ca44-4f74-9cab-c54484d88593

Shrimpton, J.S. and Amine-Eddine, G.H. (2013) On simulations investigating droplet diameter-charge distributions in electrostatically atomized dielectric liquid sprays. International Journal for Numerical Methods in Fluids, 72 (10), 1051-1075. (doi:10.1002/fld.3776).

Record type: Article

Abstract

A general procedure has been developed for the simulation of charged liquid and electrostatically atomized sprays. The procedure follows a Lagrangian approach for simulation of spray droplets and an Eulerian approach for gas phase variables, including the electric field generated by the charge presence on droplets. Validation of the procedure was examined through simulations of previously published charged spray experiments. Results showed that for the specification of initial droplet charge, modelling the droplet charge-diameter relationship through a scaling law is as reliable a method as using a directly obtained charge-diameter relationship from experimental measurements. The normalised root-mean-squared errors for sprays using the two methods were shown to be within 12% of one another, for the prediction of spatially averaged profiles of mean droplet diameters, mean axial velocities and mean radial droplet velocities. Results showed that the general spatial characteristics and dynamics of a charged liquid spray can successfully be reproduced, including the axial and radial dispersal pattern of droplets, and the distribution of mean droplet diameters throughout the spray plume. For all sprays with droplet charges defined through a scaling law relationship, the normalised root-mean-squared errors range from 9.0% to 31.6% for mean droplet diameters, 10.4% to 67.9% for mean axial droplet velocities, and 16.8% to 38.6% for mean radial droplet velocities. Lastly, we present a brief set of general recommendations for simulating electrostatically atomized dielectric liquid sprays.

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More information

e-pub ahead of print date: 6 February 2013
Published date: 10 August 2013
Keywords: charge injection, electrostatic atomization, charged sprays, cfd
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 353873
URI: http://eprints.soton.ac.uk/id/eprint/353873
ISSN: 0271-2091
PURE UUID: f99627f7-0e13-4968-8bb8-4e57d7627b31

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Date deposited: 24 Jun 2013 09:29
Last modified: 16 Jul 2019 21:30

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Contributors

Author: J.S. Shrimpton
Author: G.H. Amine-Eddine

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