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Atomization and Sprays
Импакт фактор: 1.262 5-летний Импакт фактор: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

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

Выпуски:
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.v15.i4.50
pages 423-438

SUPPRESSION OF AEROSOL GENERATION DURING SPRAYING AND DEPOSITION OF CONSUMER PRODUCTS

D. Ken Giles
Department of Biological and Agricultural Engineering, University of California—Davis, Bainer Hall, One Shields Avenue, Davis, CA 95616, USA
Daniel Downey
Bio & Ag Eng, UC Davis
H. Scher
Department of Biological and Agricultural Engineering, University of California—Davis, Bainer Hall, One Shields Avenue, Davis, CA 95616
D. Winetzky
Genencor International, Palo Alto, CA 94304
T. Becker
Genencor International, Palo Alto, CA 94304
J. Hogue
Genencor International, Palo Alto, CA 94304

Краткое описание

This study investigated droplet-size spectra and aerosol production from consumer products dispensed by disposable trigger sprayers for deposition on household surfaces. A strategy was devised to reduce the generation of small, mobile droplets through nozzle selection and manipulation of fluid properties. Parametric experiments with a generic laundry stain remover ("prespotter"), five spray dispenser designs, and four concentrations of a long-chain polymer were conducted. Surface tension of the test formulations ranged from 0.0350 to 0.0365 N/m. Shear viscosities ranged from 258 to 165 cps (shear rate of 7.5 s−1) and 66 to 48 cps (shear rate of 75 s−1). Polymer concentrations ranged from 0.00% to 0.10% w/w. Elongational viscosity characteristics were measured using a modified flow technique modeled after R. W. Dexter [14]. Droplet size spectra of the spray discharged from dispensers were measured with a laser-diffraction system. Design of the trigger spray nozzle significantly affected the droplet size spectra. For all trigger sprayers studied, addition of polymer to the spray formulation significantly reduced the generation of aerosol droplets. Mass transfer studies confirmed that addition of polymer reduced airborne spray aerosols by 86% to 94%. Similarly, addition of the polymer reduced the generation of mobile aerosols from spray impaction on target surfaces by 47−98%, depending on nozzle design and target surface characteristics.


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