The prediction of fully developed turbulent pressure drops in a triangular duct for a power law fluid
Abstract
A model in which the nondimensional eddy viscosity and velocity distributions in circular pipe flow are applicable to noncircular passage flows was applied to the prediction of fully developed turbulent pressure drops in triangular ducts for Newtonian and power law fluids. The numerical calculations for the predicted turbulent velocity profiles and friction factors in triangular ducts were carried out by utilizing a modified integral transformation after Krajewski and the laminar velocity solutions for power law fluids. Friction factors for Newtonian and power law fluid flows were experimentally investigated over a Reynolds number range of 500 to 40000 in isosceles triangular ducts having apex angles of 10 and 60 degrees. Comparisons were made between the theoretical and experimental results. For the 60 degree duct, the model was successful in predicting friction factorReynolds number relations for power law fluids in the range 0.857 n 1. For the 10 degree duct, the model was unable to account for the laminarization of the flow in the apex region and the presence of secondary flows.
 Publication:

Ph.D. Thesis
 Pub Date:
 1984
 Bibcode:
 1984PhDT........55C
 Keywords:

 Ducted Flow;
 Fluid Power;
 Mathematical Models;
 Pipe Flow;
 Pressure Reduction;
 Triangles;
 Turbulent Flow;
 Eddy Viscosity;
 Friction;
 Integral Transformations;
 Newtonian Fluids;
 Pressure Distribution;
 Reynolds Number;
 Turbulence Effects;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer