Maximum spreading of a shear-thinning liquid drop impacting on dry solid surfaces

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In the present study, the maximum spreading of Newtonian and shear-thinning drops impacting on dry surfaces was investigated experimentally. Water, glycerin drops (Newtonian liquids) and xanthan drops (shear-thinning liquids) were impinged upon the flat surfaces of glass, stainless steel and parafilm-M substrates, which have hydrophilic, moderate and hydrophobic properties, respectively, at the impact velocities ranging from 0.8 to 4.0 m/s. The impact velocity and the liquid viscosity with the shear-thinning characteristic had dominant effects on the maximum spreading; on the other hand, the surface wettability effect turned out to be minor. Several maximum spreading models for a Newtonian liquid were reviewed briefly and compared with the experimental measurements. The Roisman model showed the best agreement to the experimental results for Newtonian drops. A new empirical correlation for the maximum spreading of a shear-thinning drop was proposed by modifying the Scheller and Bousfield model with the concept of the effective shear viscosity, which is correlated with the shear rate varying with the impact velocity. The correlation agreed to within 5% for 91% of the shear-thinning drop experiments. (C) 2011 Elsevier Inc. All rights reserved.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2012-04
Language
English
Article Type
Article
Keywords

SPLAT-QUENCH SOLIDIFICATION; YIELD-STRESS; FLAT SURFACES; LOW WEBER; DYNAMICS; FLUIDS; ELASTICITY; NUMBERS

Citation

EXPERIMENTAL THERMAL AND FLUID SCIENCE, v.38, pp.140 - 148

ISSN
0894-1777
DOI
10.1016/j.expthermflusci.2011.12.003
URI
http://hdl.handle.net/10203/99562
Appears in Collection
ME-Journal Papers(저널논문)
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