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ILASS Americas, 22nd Annual Conference on Liquid Atomization and Spray Systems, Cincinnati, OH, May 2010
 

Summary: ILASS Americas, 22nd
Annual Conference on Liquid Atomization and Spray Systems, Cincinnati, OH, May 2010
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Corresponding Author: gaguilar@engr.ucr.edu
Droplet Lamella Lift Dynamics and Surface Wettability
H. Vu and G. Aguilar*
Department of Mechanical Engineering
University of California- Riverside
Riverside, CA 92507 USA
Abstract
Droplet impact on dry, smooth surfaces remains an issue for a variety of important applications such as fuel injec-
tion, spray cooling, metallurgy, pesticides and coatings. The mechanisms that initiate splashing are highly complex
and differ from those on rough or pre-wetted surfaces. In this work, droplet wettability on a smooth, dry surface is
examined to quantitatively evaluate its influence on splashing. Water droplets of approximately 3.5 mm diameter
and velocities ranging from 2.2-3.5 m/s were dropped onto a smooth, Plexiglas surface. Hydrophobic and hydrophil-
ic coatings were applied to the surface in order to change wetting characteristics. It was found that the hydrophilic
surface required higher gas densities for splashing to occur and vice versa for the hydrophobic surface. Focusing on
the spreading lamella, a momentum balance was derived with consideration of the chemical affinity or adhesive
force of the liquid to the impact surface. The lamella lift from the surface was assumed to be induced by the dis-

  

Source: Aguilar, Guillermo - Department of Mechanical Engineering, University of California at Riverside

 

Collections: Engineering