Author(s)

V.T. Nguyen, K. Kahine, and M. Lebouche

Abstract

Numerical prediction of energy losses of non Newtonian laminar flow through an abrupt enlargement V.T. Nguyen, K. Kahine, and M. Lebouche Labor atoire d'Energetique et de Mecanique Theorique et Poincare Nancy /, 2 Av. de la Foret de Haye, 54504 Vandoeuvre-Les-Nancy Cedex, France Abtract A laminar flow of an incompressible pseudoplastic fluid through an abrupt enlargement is considered. The mathematical model has been solved numerically by a finite volume scheeme using a non uniform staggered grid. The purpose of this paper is to investigate the effects of different parameters on the energy losses due to this singularity. The results show that the coefficient of the energy loss tends to a limit with increasing generalized Reynolds number. By studing the evolution of the ratio of energy loss to wall shear stress, it is noted that it is practically linear function of Reynolds number. Therefore, it would be more efficient to use this ratio for prediction of the energy losses. 1. Introduction

Keywords