Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.277 SNIP: 0.52 CiteScore™: 1.3

ISSN Imprimir: 2151-4798
ISSN On-line: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/SpecialTopicsRevPorousMedia.2018022333
pages 329-345

ELECTROHYDRODYNAMIC INSTABILITIES OF ATOMIZATION AND RAYLEIGH REGIMES FOR A DIELECTRIC LIQUID JET EMANATED WITH PARABOLIC VELOCITY PROFILE INTO A STATIONARY DIELECTRIC GAS THROUGH POROUS MEDIUM

Mohamed El-Sayed
Ph. D.

RESUMO

A linear electrohydrodynamic (EHD) axisymmetric analysis is performed analytically to arrive at the dispersion relation that governs the instability of a dielectric liquid jet emanated with parabolic velocity profile into a dielectric gas through porous medium. The velocity profile within the liquid jet is varied from parabolic to uniform in order to model the effects on its relaxation on the liquid jet instability and intact length under the effects of electric field and porous medium. Both the atomization and Rayleigh regimes of instability have been discussed for all parameters included. The results indicate that the closer the velocity profile to uniform the most pronounced the instability, and both the electric field and porosity of porous medium have stabilizing effects, while increasing gas to liquid density ratio, medium permeability and dielectric constants promote instability in the two regimes. The Weber number, in the atomization regime, has a destabilizing effect, while it has a stabilizing effect in the Rayleigh regime. The kinematic viscosities are found to have dual roles on the stability of the system in both regimes separated by a critical wave number in each case. Finally, we conclude that the system in the atomization regime is more unstable than in the Rayleigh regime, and also the system in the presence of electric field and porous medium is more unstable than in their absence.


Articles with similar content:

Effect of Rotation on the Onset of Convection in Rivlin − Ericksen Fluid Heated from below in a Brinkman Porous Medium
International Journal of Fluid Mechanics Research, Vol.39, 2012, issue 6
Gian C. Rana, V. Sharma
ELECTROHYDRODYNAMIC INSTABILITY OF LIQUID SHEET SATURATING POROUS MEDIUM WITH INTERFACIAL SURFACE CHARGES
Atomization and Sprays, Vol.23, 2013, issue 2
Mohamed El-Sayed, N. M. Hafez, Ahmed A. A. Hassan, M. H. M. Moussa
AXISYMMETRIC AND ASYMMETRIC INSTABILITIES OF A NON-NEWTONIAN LIQUID JET MOVING IN AN INVISCID STREAMING GAS THROUGH POROUS MEDIA
Journal of Porous Media, Vol.19, 2016, issue 9
F. M. F. Elsabaa, G. M. Moatimid, Mohamed El-Sayed, M. F. E. Amer
LINEAR STABILITY ANALYSIS OF ELECTRIFIED VISCOELASTIC LIQUID SHEETS
Atomization and Sprays, Vol.22, 2012, issue 11
Yu-Xin Liu, Qing-Fei Fu, Li-Jun Yang, Yan Ning, Chen Wang
NUMERICAL INVESTIGATIONS OF STABILITY OF STRATIFIED VISCOELASTIC WALTERS' (MODEL B') FLUID/PLASMA IN THE PRESENCE OF QUANTUM PHYSICS SATURATING A POROUS MEDIUM
Journal of Porous Media, Vol.17, 2014, issue 2
Veena Sharma, Radhe Shyam, Sudrshna Sharma