Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Atomization and Sprays
Facteur d'impact: 1.262 Facteur d'impact sur 5 ans: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

Volumes:
Volume 29, 2019 Volume 28, 2018 Volume 27, 2017 Volume 26, 2016 Volume 25, 2015 Volume 24, 2014 Volume 23, 2013 Volume 22, 2012 Volume 21, 2011 Volume 20, 2010 Volume 19, 2009 Volume 18, 2008 Volume 17, 2007 Volume 16, 2006 Volume 15, 2005 Volume 14, 2004 Volume 13, 2003 Volume 12, 2002 Volume 11, 2001 Volume 10, 2000 Volume 9, 1999 Volume 8, 1998 Volume 7, 1997 Volume 6, 1996 Volume 5, 1995 Volume 4, 1994 Volume 3, 1993 Volume 2, 1992 Volume 1, 1991

Atomization and Sprays

DOI: 10.1615/AtomizSpr.2017019152
pages 629-643

PARTICLE AND DROPLET CLUSTERING IN OSCILLATORY VORTICAL FLOWS

Yuval Dagan
Faculty of Aerospace Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel
David Katoshevski
Environmental Engineering Unit, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel
J. Barry Greenberg
Faculty of Aerospace Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel

RÉSUMÉ

A new mathematical analysis of particle and droplet clustering in a fluctuating vortex flow is presented. Two-dimensional particle and droplet dynamics equations are solved numerically and analytically, assuming an oscillating vortex flow field. Droplet grouping was found to occur in the vicinity of an oscillating vortex and new streak-like grouping patterns of droplets in a vortex are disclosed. The combination of circumferential and radial fluctuations produces the most significant effects on the droplet grouping, facilitating the construction and destruction of the streak patterns, depending on the chosen flow field and droplet properties. A new analytical formulation is derived using perturbation analyses to model the swirl fluctuations on the spray, providing a simple method to evaluate the effect of droplet dispersion and droplet clustering under fluctuating vortex flows. This approach was found to be in good agreement with the numerical results in cases of low Stokes numbers for both evaporating and nonevaporating droplets. It is shown that evaporation tends to increase the droplet fluctuation amplitude with time and therefore intensifies the grouping effect. The combination of oscillation and evaporation was found to have the most significant effect on droplet grouping, where the amplitude of the proximity curve rapidly increases in a nonlinear manner. Despite the simplicity of the current model its predictions provide insight into the driving mechanisms behind the much more complex turbulent spray-combustion regime, in which similar droplet grouping patterns occur.


Articles with similar content:

DYNAMICS OF ELASTO-INERTIAL TURBULENCE IN FLOWS WITH POLYMER ADDITIVES
TSFP DIGITAL LIBRARY ONLINE, Vol.8, 2013, issue
Julio Soria, Yves Dubief, Vincent E. Terrapon
GENERALISED OPTIMAL PERTURBATION APPROACH APPLIED TO DRAG REDUCTION BY WALL OSCILLATIONS IN TURBULENT FLOWS
TSFP DIGITAL LIBRARY ONLINE, Vol.7, 2011, issue
Sergei I. Chernyshenko, Olivier Blesbois
NUMERICAL STUDY OF THE STABILISATION OF TOLLMIEN-SCHLICHTING WAVES BY FINITE AMPLITUDE STREAKS
TSFP DIGITAL LIBRARY ONLINE, Vol.5, 2007, issue
Luca Brandt, Phillipp Schlatter, Rick De Lange
COMBINED SPRAY MODEL FOR GASOLINE DIRECT INJECTION HOLLOW-CONE SPRAYS
Atomization and Sprays, Vol.20, 2010, issue 4
D. Martin, Reinhold Kneer, Philipp Pischke
Interaction of Axial and Cyclotron Electronic Oscillations in M-Type Devices
Telecommunications and Radio Engineering, Vol.60, 2003, issue 1&2
V. B. Baiburin, A. V. Sysuev, V. A. Sysuev, A. A. Terentiev