Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Atomization and Sprays
Fator do impacto: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

Volumes:
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.2016016052
pages 81-94

COALESCENCE AND AGGLOMERATION OF DROPLETS SPRAYED ON A SUBSTRATE

Alireza Dalili
Center for Advanced Coating Technologies, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 3G8
Javad Esmaeelpanah
Center for Advanced Coating Technologies, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 3G8
Sanjeev Chandra
Center for Advanced Coating Technologies, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 3G8
Javad Mostaghimi
Center for Advanced Coating Technologies, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 3G8

RESUMO

The coalescence of droplets of a highly viscous liquid (87 wt% glycerin in water) sprayed onto a solid surface was studied. Experiments were done on the merger of two droplets deposited sequentially on a flat surface and also on liquid droplets sprayed onto a surface. Two unequal sized droplets were deposited on a steel plate, with the smaller one overlapping the larger. The different curvatures of the two droplets produce different capillary pressures in them, driving them to merge. The smaller droplet was pulled into the larger one; the greater the difference in size between the droplets, and the larger their separation, the more rapid the droplet motion. Experiments were also done in which liquid was sprayed onto a transparent surface and the motion of the impacting droplets photographed from below. Measurements of the wetted surface area were done using image analysis. The wetted area first increased as liquid was deposited. Once the spray was turned off the area decreased as smaller droplets merged with larger ones. Droplet coalescence prevented the formation of a uniform film and liquid accumulated in separate patches.