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Research Papers: Multiphase Flows

Centrifugal Pump Derating for Non-Newtonian Slurries

[+] Author and Article Information
J. J. N. Kalombo

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

R. Haldenwang

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

R. P. Chhabra

Department of Chemical Engineering,
Indian Institute of Technology,
Kanpur, India;
Adjunct Professor
Flow Process and Rheology Centre,
Cape Peninsula University of Technology,
P.O. Box 652,
Cape Town, 8000, South Africa
e-mail: chhabra@iitk.ac.in

V. G. Fester

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

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 22, 2013; final manuscript received November 5, 2013; published online January 20, 2014. Assoc. Editor: Bart van Esch.

J. Fluids Eng 136(3), 031302 (Jan 20, 2014) (11 pages) Paper No: FE-13-1184; doi: 10.1115/1.4025989 History: Received March 22, 2013; Revised November 05, 2013

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.

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References

Figures

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Fig. 1

Comparison between predicted and experimental pump efficiency for a 17% kaolin slurry [17]

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Fig. 2

Layout of the pump test rig (top view of the rig)

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Fig. 3

Warman 4/3 pump head curves compared to Pullum et al. and Walker and Goulas models

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Fig. 4

Warman 4/3 pump efficiency curves compared to Pullum et al. and Walker and Goulas models

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Fig. 5

Experimental head (efficiency) versus calculated head (efficiency) for the Warman 4/3 pump using the Walker and Goulas [6] approach

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Fig. 6

Experimental head (efficiency) versus calculated head (efficiency) for the GIW 4/3 using the Walker and Goulas [6] approach

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Fig. 7

Experimental head (efficiency) versus calculated head (efficiency) for the Warman 6/4 using the Walker and Goulas [6] approach

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Fig. 8

Experimental head (efficiency) versus calculated head (efficiency) for the Warman 4/3 pump using the Pullum et al. [1] approach

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Fig. 9

Experimental head (efficiency) versus calculated head (efficiency) for the GIW 4/3 using the Pullum et al. [1] approach

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Fig. 10

Experimental head (efficiency) versus calculated head (efficiency) for the Warman 6/4 using the Pullum et al. [1] approach

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Fig. 11

Comparison between the results obtained using w = 0.059 and w = 0.023 for the pump head prediction

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Fig. 12

Sensitivity of the pump performance prediction procedures to a change in viscosity for the Warman 4/3 pump

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