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Journal of Applied Fluid Mechanics، جلد ۹، شماره ۳، صفحات ۱۰۳۵-۱۰۴۰
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عنوان انگلیسی Effect of Hydrophobic Coating on Hagen-Poiseuille Flows
چکیده انگلیسی مقاله 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.
کلیدواژه‌های انگلیسی مقاله PIV visualization, Slip velocity, Hagen, Drag reduction, poiseuille equation
نویسندگان مقاله A. Ríos-Rodríguez |
Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, DF 04510, México.

C. A. Palacios-Morales |
Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, DF 04510, México.

E. Bernal |
Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, DF 04510, México.

G. Ascanio |
Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, DF 04510, México.

J. P. Aguayo-Vallejo |
Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, DF 04510, México.

نشانی اینترنتی https://www.jafmonline.net/article_1680_d5cf54dfe0f82a55c8a3eedbfc79e37e.pdf
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