Imperial College London
Portrait Picture

Professor Omar K. Matar, FREng

Faculty of Engineering, Department of Chemical Engineering

Head of Department of Chemical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 9618o.matar Website

 
 
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Assistant

 

Mr Avery Kitchens +44 (0)20 7594 6263

 
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Location

 

305 ACEACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Constante-Amores:2021:10.1017/jfm.2021.519,
author = {Constante-Amores, CR and Kahouadji, L and Batchvarov, A and Shin, S and Chergui, J and Juric, D and Matar, OK},
doi = {10.1017/jfm.2021.519},
journal = {Journal of Fluid Mechanics},
pages = {1--28},
title = {Direct numerical simulations of transient turbulent jets: vortex-interface interactions},
url = {http://dx.doi.org/10.1017/jfm.2021.519},
volume = {922},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The breakup of an interface into a cascade of droplets and their subsequent coalescence is a generic problem of central importance to a large number of industrial settings such as mixing, separations and combustion. We study the breakup of a liquid jet introduced through a cylindrical nozzle into a stagnant viscous phase via a hybrid interface-tracking/level-set method to account for the surface tension forces in a three-dimensional Cartesian domain. Numerical solutions are obtained for a range of Reynolds (Re) and Weber (We) numbers. We find that the interplay between the azimuthal and streamwise vorticity components leads to different interfacial features and flow regimes in Re–We space. We show that the streamwise vorticity plays a critical role in the development of the three-dimensional instabilities on the jet surface. In the inertia-controlled regime at high Re and We, we expose the details of the spatio-temporal development of the vortical structures affecting the interfacial dynamics. A mushroom-like structure is formed at the leading edge of the jet inducing the generation of a liquid sheet in its interior that undergoes rupture to form droplets. These droplets rotate inside the mushroom structure due to their interaction with the prevailing vortical structures. Additionally, Kelvin–Helmholtz vortices that form near the injection point deform in the streamwise direction to form hairpin vortices, which, in turn, trigger the formation of interfacial lobes in the jet core. The thinning of the lobes induces the creation of holes which expand to form liquid threads that undergo capillary breakup to form droplets.
AU  - Constante-Amores,CR
AU  - Kahouadji,L
AU  - Batchvarov,A
AU  - Shin,S
AU  - Chergui,J
AU  - Juric,D
AU  - Matar,OK
DO  - 10.1017/jfm.2021.519
EP  - 28
PY  - 2021///
SN  - 0022-1120
SP  - 1
TI  - Direct numerical simulations of transient turbulent jets: vortex-interface interactions
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2021.519
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000669016400001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/direct-numerical-simulations-of-transient-turbulent-jets-vortexinterface-interactions/A419969A9C6A96FC15811EE7B04E33A8
UR  - http://hdl.handle.net/10044/1/91157
VL  - 922
ER  -
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