التفاصيل البيبلوغرافية
| العنوان: |
Effect of Hydrophobic Coating on Hagen-Poiseuille Flows. |
| المؤلفون: |
Ríos-Rodríguez, A., Palacios-Morales, C. A., Bernal, E., Ascanio, G., Aguayo-Vallejo, J. P. |
| المصدر: |
Journal of Applied Fluid Mechanics; 2016, Vol. 9 Issue 3, p1035-1040, 6p |
| مصطلحات موضوعية: |
HYDROPHOBIC interactions, GLASS pipe |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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