Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN On-line: 2152-5110

Volumes:
Volume 46, 2019 Volume 45, 2018 Volume 44, 2017 Volume 43, 2016 Volume 42, 2015 Volume 41, 2014 Volume 40, 2013 Volume 39, 2012 Volume 38, 2011 Volume 37, 2010 Volume 36, 2009 Volume 35, 2008 Volume 34, 2007 Volume 33, 2006 Volume 32, 2005 Volume 31, 2004 Volume 30, 2003 Volume 29, 2002 Volume 28, 2001 Volume 27, 2000 Volume 26, 1999 Volume 25, 1998 Volume 24, 1997 Volume 23, 1996 Volume 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v24.i1-3.420
pages 416-427

Unsteady Breakup of Liquid Jets in Coaxial Airblast Atomizers

Yannis Hardalupas
Department of Mechanical Engineering, Imperial College London London, SW7 2AZ, United Kingdom
R.-F. Tsai
National Hu-wei Institute of Technology (NHIT), Department of Automation Engineering, Hu-wei, Yun-Lin, Taiwan
Jim H. Whitelaw
Thermofluids Section, Department of Mechanical Engineering, Imperial College of Science, Technology and Medicine, London SW7 2BX, United Kingdom

RESUMO

The breakup process of coaxial airblast atomizers, comprising an annular axial air stream with a central liquid jet, was examined with high speed photography over a range of exit Weber numbers from 0 to 2300, air-to-liquid momentum and energy ratios from 0 to 130 and 0 to 11700 respectively, liquid jet Reynolds number from 3000 to 46000 and nozzles with air jet diameter 23, 15 and 9 mm and liquid jets with 2.3 and 1.2 mm. The photographs showed the deterministic unsteadiness of the breakup process leading in the formation of clusters in a nearly periodic manner and quantified the breakup length, frequency, cluster length and velocity, wavelength of the wave responsible for the breakup and the energy transfer from the air to the liquid jet. A simplified breakup model was based on surface waves due to Kelvin-Helmholtz instability, which grow through non-linear processes to form waves with long wavelength relative to the liquid jet diameter.


Articles with similar content:

BREAKUP OF A WATER JET IN HIGH VELOCITY CO-FLOWING AIR
ICLASS 94
Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems, Vol.0, 1994, issue
E.J. Hopfinger, Juan C. Lasheras
EDGE INSTABILITY AND VELOCITY OF LIQUID SHEETS FORMED BY TWO IMPINGING JETS
Atomization and Sprays, Vol.17, 2007, issue 1
Nasser Ashgriz, Ri Li
ATOMIZATION BEHAVIOR AND ENERGY ANALYSIS FOR A SINGLE DROPLET IMPINGED ON A SURFACE OSCILLATING WITH ULTRASONIC FREQUENCY
Atomization and Sprays, Vol.17, 2007, issue 7
Akira Ishii, Masataka Arai, Masahiro Saito
MORPHOLOGICAL CLASSIFICATION OF DISINTEGRATION OF ROUND LIQUID JETS IN A COAXIAL AIR STREAM
Atomization and Sprays, Vol.2, 1992, issue 2
Zoltan Farago, Norman Chigier
DIESEL SPRAY ATOMIZATION MODEL CONSIDERING NOZZLE EXIT TURBULENCE CONDITIONS
Atomization and Sprays, Vol.8, 1998, issue 4
Kang Y. Huh, Eunju Lee, Jaye Koo