Library Subscription: Guest
Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections
Atomization and Sprays
IF: 1.189 5-Year IF: 1.596 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

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

Volumes:
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.v5.i3.60
pages 343-356

FLUID VELOCITY AND SHEAR IN ELLIPTIC-ORIFICE SPRAY NOZZLES

H. Zhu
Department of Agricultural Engineering, Ohio State University, OARDC, Wooster, OH 44691, USA
R. D. Brazee
Application Technology Research Unit, U.S. Department of Agriculture, Agricultural Research Service, Wooster, OH, 44691, USA
D. L. Reichard
Deceased, formerly, U.S. Department of Agriculture, Agricultural Research Service, Wooster, Ohio, USA
R. D. Fox
U.S. Department of Agriculture, Agricultural Research Service, Wooster, Ohio, USA
C. R. Krause
Application Technology Research Unit, U.S. Department of Agriculture, Agricultural Research Service, Wooster, OH, 44691, USA
Andrew C. Chapple
c/o Koyntoypiotoy 13, Tpiandria 55337, Thessaloniki, Greece

ABSTRACT

With new pest control and bioregulating formulations under development and coming into use to improve spray retention and coverage, concerns have arisen about possible adverse effects on spray solutions due to fluid shear occurring in nozzles. Mathematical models were developed for velocity and shear-rate distributions for incompressible liquid flow through fan-pattern spray nozzles having approximately elliptic outlet orifices. The velocity distribution model was verified with phase/Doppler particle analyzer measurements and computational fluid dynamic simulations. A mean fluid velocity section of the model predicted the axial flow velocity to be 29.03 m/s for an 8002 brass fan-pattern nozzle with 276 kPa operating pressure, compared with a mean measured value of 29.85 m/s. With the shear rate model, it was found that use of an older equivalent-circle model resulted in significant underestimates of shear rates for fan-pattern nozzles. Liquid shear rates at the orifice wall varied with position, and were estimated to fall in the range 1.2 × 105 to 7 × 105 s−1 for the spray nozzles studied, depending on nozzle characteristics and operating pressure over a range of 138 to 414 kPa.