Computation of turbulent flow of air through smooth and rough pipes using a twoequation turbulence model
Abstract
A computational method is developed to calculate fully developed and developing turbulent flow fields through smooth and rough pipes using a twoequation turbulence model. The flow in the duct is partitioned into finite streams. The difference equations are then obtained by applying conservation principles directly to the individual streams. A TwoEquation turbulence model (kappaepsilon) is used in conjunction with the wall function formulas. The wall functions for the mass, momentum, enthalpy, turbulent kinetic energy and dissipation rate are derived for both smooth and rough pipes. Roughness effects are accounted by inserting a form drag term in the momentum equation, a source term in the enthalpy equation, and an additional generation term in the turbulent kinetic energy equation. The results of this study are in good agreement with available experimental and analytical data for smooth and rough pipes.
 Publication:

Ph.D. Thesis
 Pub Date:
 May 1987
 Bibcode:
 1987PhDT.........6Z
 Keywords:

 Computational Fluid Dynamics;
 Flow Distribution;
 Pipes (Tubes);
 Roughness;
 Smoothing;
 Turbulence Models;
 Turbulent Flow;
 Difference Equations;
 Ducts;
 Enthalpy;
 KEpsilon Turbulence Model;
 Kinetic Energy;
 Models;
 Turbulence;
 Wall Flow;
 Fluid Mechanics and Heat Transfer