Asymptotic analysis of the selective dip coating of power-law fluids
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DOI: 10.1063/1.2842378
Abstract
The dip coating of a chemically micropatterned surface bearing alternating wetting and nonwetting vertical strips is analyzed for a non-Newtonian power-law fluid. Asymptotic matching is used to determine the thickness of liquid films deposited on the O(10 μm) strips at small capillary and Bond numbers. The chemical patterning that confines the fluid laterally induces a significant transverse curvature of the free-surface. The streamwise variation in this transverse curvature along the strip provides an additional contribution to the capillary pressure gradient that is not present for uniform surfaces. Consequently, the difference in the thickness of the deposited liquid film relative to a Newtonian fluid is significantly less than for homogeneous plates or fibers.
Suggested Citation
N Tiwari and JM Davis. "Asymptotic analysis of the selective dip coating of power-law fluids" Physics of Fluids 20.2 (2008).
Available at: http://works.bepress.com/jeffrey_davis/2
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