Centrifugal Pump Derating for Non-Newtonian Slurries

Author:

Kalombo J. J. N.1,Haldenwang R.1,Chhabra R. P.23,Fester V. G.1

Affiliation:

1. Flow Process and Rheology Centre, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa e-mail:

2. Department of Chemical Engineering, Indian Institute of Technology, Kanpur, India;

3. Adjunct Professor Flow Process and Rheology Centre, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa e-mail:

Abstract

The Hydraulic Institute method, developed for predicting centrifugal pump performance of viscous Newtonian fluids, is used by some for non-Newtonian fluids. This requires an average value of viscosity representing the variable non-Newtonian viscosities. To determine such an average viscosity, two approaches exist in the literature: the use of a Bingham plastic viscosity and the use of the apparent viscosity. Results from these two approaches are not in agreement. This study evaluates the two approaches using two independent datasets, obtained from three pumps and three fluids. Results indicate that using the apparent viscosity approach gave better head prediction and using the Bingham plastic viscosity resulted in better efficiency prediction.

Publisher

ASME International

Subject

Mechanical Engineering

Reference17 articles.

1. Centrifugal Pump Performance Calculation for Homogeneous and Complex Heterogeneous Suspensions;Journal of the Southern African Institute of Mining and Metallurgy,2007

2. Dredge Pump Performance Prediction;J. Pipelines,1986

3. Comparative Evaluation of Some Existing Correlations to Predict Head Degradation of Centrifugal Slurry Pumps;ASME J. Fluids Eng.,2003

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