Paper Information

Journal:   JOURNAL OF APPLIED FLUID MECHANICS (JAFM)   2016 , Volume 9 , Number 3; Page(s) 1035 To 1040.
 
Paper: 

EFFECT OF HYDROPHOBIC COATING ON HAGEN-POISEUILLE FLOWS

 
 
Author(s):  RIOS RODRIGUEZ A., PALACIOS MORALES C.A., BERNAL E., ASCANIO G., AGUAYO VALLEJO J.P.*
 
* CENTRO DE CIENCIAS APLICADAS Y DESARROLLO TECNOLOGICO, UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO, CIRCUITO EXTERIOR, CIUDAD UNIVERSITARIA, DF 04510, MEXICO.
 
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.

 
Keyword(s): SLIP VELOCITY, PIV VISUALIZATION, HAGEN-POISEUILLE EQUATION, DRAG REDUCTION
 
References: 
  • ندارد
 
  pdf-File tarjomyar Yearly Visit 29
 
Latest on Blog
Enter SID Blog