Доступ предоставлен для: Guest
Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Atomization and Sprays
Импакт фактор: 1.737 5-летний Импакт фактор: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 2.2

ISSN Печать: 1044-5110
ISSN Онлайн: 1936-2684

Выпуски:
Том 30, 2020 Том 29, 2019 Том 28, 2018 Том 27, 2017 Том 26, 2016 Том 25, 2015 Том 24, 2014 Том 23, 2013 Том 22, 2012 Том 21, 2011 Том 20, 2010 Том 19, 2009 Том 18, 2008 Том 17, 2007 Том 16, 2006 Том 15, 2005 Том 14, 2004 Том 13, 2003 Том 12, 2002 Том 11, 2001 Том 10, 2000 Том 9, 1999 Том 8, 1998 Том 7, 1997 Том 6, 1996 Том 5, 1995 Том 4, 1994 Том 3, 1993 Том 2, 1992 Том 1, 1991

Atomization and Sprays

DOI: 10.1615/AtomizSpr.v11.i4.80
pages 433-452

EXPERIMENTAL STUDY OF THE TRANSITION TO THE FULLY DEVELOPED REGIME IN A SPRAY FROM A PLAIN JET ATOMIZER

T. Boedec
Ecole Centrale de Lyon, LMFA UMR CNRS 5509, Ecully Cedex, France
J. L. Marie
Ecole Centrale de Lyon, LMFA UMR CNRS 5509, Ecully Cedex, France
J. C. Champoussin
Ecole Centrale de Lyon, LMFA UMR CNRS 5509, Ecully Cedex, France

Краткое описание

One-point measurements made with a phase Doppler anemometer allow us to measure droplets’ velocity (two components) and diameter in a stationary spray produced by the discharge of pressurized water through a sharp-edged nozzle. This two-phase flow, first driven by the dense atomized liquid, reaches, at sufficient distance from the injector, a state where the motion of the dispersed phase (the droplets) is controlled by the continuous phase (the air), and the spray can be considered as fully developed. This transition can be recognized by five different criteria. (1) The first is based on the droplet mean axial velocity. (2) The second arises from the measurement of the air entrainment around the spray. (3) The profiles of the dimensionless fluctuations of the drop axial velocity represent the third criterion. (4) The fourth is related to the mean-square droplet displacement (estimated from the droplet flux profiles). (5) The last is connected with the evolution of the mixing layer thickness, based on the momentum of the droplets. We found that the transition to the fully developed regime is not reached at the same location for each class of droplet size, suggesting a selective response of the droplets to the surrounding gas flow. The validation of the above-proposed criteria on complementary experiments performed with two nozzles having the same geometry but different internal roughness indicates that they can be used as a practical diagnostic to identify the transition in this type of jets.


Articles with similar content:

CHARACTERIZATION OF THE STRUCTURE OF A NON-EVAPORATING DIESEL SPRAY
ICLASS 94
Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems, Vol.0, 1994, issue
B. Gimenez, A. Melgar, F. Castro, M. L. Sanchez, F. V. Tinaut
EXPERIMENTAL STUDY OF COAXIAL ATOMIZERS SCALING. PART I: DENSE CORE ZONE
Atomization and Sprays, Vol.17, 2007, issue 5
Francois Lacas, Bertrand Leroux, Olivier Delabroy
Experimental Investigation of Polydisperse Spray Interaction
International Journal of Fluid Mechanics Research, Vol.24, 1997, issue 4-6
Günter Brenn, A. Selbach
EXPERIMENTAL INVESTIGATION OF THE ATOMIZATION CHARACTERISTICS OF ANTICORROSION WAX
Atomization and Sprays, Vol.23, 2013, issue 7
Sanghoon Lee, Sungwook Park
THE INFLUENCE OF VISCOELAST1C FLUID PROPERTIES ON SPRAY FORMATION FROM FLAT-FAN AND PRESSURE-SWIRL ATOMIZERS
Atomization and Sprays, Vol.12, 2002, issue 1-3
Günter Brenn, Franz Durst, M. Stelter