Library Subscription: Guest
Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections
Atomization and Sprays
IF: 1.737 5-Year IF: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 2.2

ISSN Print: 1044-5110
ISSN Online: 1936-2684

Volumes:
Volume 30, 2020 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.2011003299
pages 139-147

EXPERIMENTAL INVESTIGATION OF AERODYNAMIC FRAGMENTATION OF LIQUID DROPS MODIFIED BY ELECTROSTATIC SURFACE CHARGE

Daniel R. Guildenbecher
Maurice J. Zucrow Laboratories, School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907-2014, USA
Paul E. Sojka
Maurice J. Zucrow Laboratories (formerly Thermal Sciences and Propulsion Center), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, 47907-2014, USA

ABSTRACT

Pressure gradients from dispersed gas flow over the surface of a liquid drop lead to fragmentation above a critical Weber number. This is sometimes referred to as secondary atomization. Alternatively, electrostatic charge creates an outward surface stress that leads to fragmentation at the Rayleigh charge limit. This study reports the behavior of drops subject to both effects; i.e., the fragmentation of charged liquid drops exposed to an aerodynamic flow field. Individual charged drops are produced using a high-voltage capillary needle, passed through an inductive charge pickup tube, and inserted into the disruptive air flow field via the influence of gravity. The resulting fragmentation is recorded with high-speed digital shadowgraphy. The behavior for drop charges up to 84% of the Rayleigh limit and initial Weber numbers from 0 to 140 is reported. Contrary to predictions from existing theoretical analyses, no significant changes in fragmentation morphology or breakup times are observed. This indicates that the combination of electrostatic and aerodynamic forces does not enhance fragmentation. A physical explanation is proposed based on the differences in instability geometries for the limiting cases of isolated aerodynamic and isolated electrostatic forces.


Articles with similar content:

PRIMARY ATOMIZATION AND DROP SIZE CHARACTERISTICS OF AN ELECTROSTATIC DIELECTRIC LIQUID PULSED ATOMIZER
Atomization and Sprays, Vol.22, 2012, issue 4
Agisilaos Kourmatzis, John S. Shrimpton
ELECTROSTATIC EFFECTS ON AGRICULTURAL AIR-ATOMIZED SPRAYS AND DEPOSITION. PART II: A COMPUTATIONAL STUDY
Atomization and Sprays, Vol.15, 2005, issue 6
M. R. Jahannama, A. Paul Watkins
MECHANISMS OF AIR-ASSISTED LIQUID ATOMIZATION
Atomization and Sprays, Vol.3, 1993, issue 1
Rolf D. Reitz, A. B. Liu
ATOMIZATION CHARACTERISTICS OF A HIGHSPEED ROTARY-BELL PAINT APPLICATOR
Atomization and Sprays, Vol.2, 1992, issue 2
Arthur H. Lefebvre, Dwight W. Senser, P. L. Corbeels
ELECTROSTATIC EFFECTS ON AGRICULTURAL AIR-ATOMIZED SPRAYS AND DEPOSITION. PART I: AN EXPERIMENTAL STUDY
Atomization and Sprays, Vol.15, 2005, issue 6
M. R. Jahannama, Andrew J. Yule, A. Paul Watkins