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Fundamental Issues and Canonical Flows

Pressure Losses and Limiting Reynolds Numbers for Non-Newtonian Fluids in Short Square-Edged Orifice Plates

[+] Author and Article Information
Butteur Ntamba Ntamba

Faculty of Engineering,  Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africamulumbabutteur@yahoo.fr

Veruscha Fester

Faculty of Engineering,  Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africafesterv@cput.ac.za

J. Fluids Eng 134(9), 091204 (Aug 22, 2012) (9 pages) doi:10.1115/1.4007156 History: Received December 05, 2011; Revised June 13, 2012; Published August 22, 2012; Online August 22, 2012

Correlations predicting the pressure loss coefficient along with the laminar, transitional, and turbulent limiting Reynolds numbers with the β ratio are presented for short square-edged orifice plates. The knowledge of pressure losses across orifices is a very important industrial problem while predicting pressure losses in piping systems. Similarly, it is important to define stable operating regions for the application of a short orifice at lower Reynolds numbers. This work experimentally determined pressure loss coefficients for square-edged orifices for orifice-to-diameter ratios of β = 0.2, 0.3, 0.57, and 0.7 for Newtonian and non-Newtonian fluids in both laminar and turbulent flow regimes.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic diagram of a short square-edged orifice

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Figure 2

Schematic diagram of the test rig

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Figure 3

Selection of data points for extrapolation of the orifice pressure drop (ΔPor)

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Figure 4

Comparison of the experimental and predicted friction factors

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Figure 5

Pressure loss coefficient data for the β-ratio: 0.2, 0.3, 0.57, and 0.7

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Figure 6

(a) Laminar and turbulent limiting Reynolds number, and (b) critical Reynolds number comparison between the current work and Alvi [3]

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Figure 7

Relationship between the minimum kor and β

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Figure 8

Relationship between Cor and kor with the diameter ratio, respectively

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Figure 9

Comparison between the new correlation and the experimental data

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