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

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.2012003897
pages 819-831


Lingyong Pan
FESTO Pneumatic Center, Huazhong University of Science and Technology, Wuhan 430074, China
Gang Yang
FESTO Pneumatic Center, Huazhong University of Science and Technology, Wuhan 430074, China
Baoren Li
FESTO Pneumatic Center, Huazhong University of Science and Technology, Wuhan 430074, China


In water mist fire suppression, where the attempt is to reach a fine mean drop size and size distribution, there is a vital demand to produce a controllable and non-pulsating spray. Effervescent atomization has better performance in terms of smaller drop size and lower injection pressure. In order to study the effects of the internal flow patterns on the droplet characteristics, the regimes of two-phase flow inside the final discharge orifice of the effervescent atomizer are investigated using computational fluid dynamics. In this paper, the volume of fluid techniques in the ANSYS Fluent software package are used to capture the gas−liquid interface. The internal flow patterns and the characteristics of the water film near the final discharge orifice are studied over a range of gas-to-liquid mass flow ratios (GLRs). Several 0.41 mm circle final discharge orifices with length/diameter (L/D) ratios of 5, 10, and 15 are test. The simulation results compare well with the experimental data. Results show that the GLR and L/D are two key control parameters. At low inject levels where bubbly or Taylor flow patterns are observed in the final discharge orifice, increasing GLR will increase the water film thickness gradually. With further increase in GLR, the water film thickness finally tends to a certain limitation. The L/D also is an important parameter that influences the pressure drop of the final discharge orifice but has little effect on the internal two-phase flow patterns and the film thickness. Based on the results of the simulation, recommendations have been made for an effective design of an effervescent atomizer and a technology choice for the water mist fire suppression system.