Effect of Hydrophobic Coating on Hagen-Poiseuille Flows
Author(s):
Alejandro R. , Iacute , Os , Rodr , Iacute , Guez , Carlos Palacios , Morales , Eduardo Bernal , Ascanio Gabriel , Juan Aguayo , Vallejo
Abstract:
The effect of a hydrophobic coating on the flow through circular pipes with Newtonian fluids has been investigated. Velocity fields inside a pipe were experimentally determined by the particle image velocimetry (PIV) technique. The test fluid presented a viscosity of about sixty times higher than water viscosity. Two glass pipe configurations were used: one uncoated and another covered with an extremely hydrophobic commercial product. Comparisons between coated and uncoated pipes were made at similar Reynolds (Re) numbers, all in the laminar regime (70-250). Results show that the hydrophobic effect consists in an observable slip velocity at the wall, with a reduction in shear rate near the pipe boundary. Pressure drop values were estimated from a modified Hagen-Poiseuille equation, taking into consideration the non-zero velocity at the boundary for both set of experiments, and the results show a 20% reduction in the pressure drop for the hydrophobic wall compared with the uncoated pipe case.
Keywords:
Language:
English
Published:
Journal Of Applied Fluid Mechanics, Volume:9 Issue: 3, May-Jun 2016
Pages:
1035 to 1040
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