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Technical Briefs

A Simple Technique for Determining Slug Frequency Using Differential Pressure

[+] Author and Article Information
R. J. Wilkens1

Department of Chemical and Materials Engineering, University of Dayton, 300 College Park, Dayton, OH 45469-0246wilkens@udayton.edu

D. K. Thomas

Department of Chemical and Materials Engineering, University of Dayton, 300 College Park, Dayton, OH 45469-0246wilkens@udayton.edu

1

Corresponding author.

J. Energy Resour. Technol 130(1), 014501 (Jan 02, 2008) (6 pages) doi:10.1115/1.2824297 History: Received April 05, 2006; Revised September 05, 2007; Published January 02, 2008

An experiment was performed to study air∕water slug frequency in a horizontal clear pipe by means of visual inspection and differential pressure measurement in the range of 01s. Results showed that a simplified model for slug pressure drop allowed the differential pressure data to compare favorably with visual observations for slug frequency. It was concluded that this technique gives a proper estimation of slug frequency, given only basic flow information. It is recommended that this technique be used when constrained to differential pressure or used to analyze existing differential pressure data.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

University of Dayton gas-liquid flow loop

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Figure 2

Sample differential pressure recording for VSL=0.36m∕s, VSG=10m∕s using this equipment (horizontal, 0.052m inside diameter, air∕water)

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Figure 3

Measured slug lengths at many inclinations based on a mix of published and proprietary field and laboratory data (0–11deg inclined; 0.025–0.2m inside diameter; 800–1000kg∕m3 liquid density; 0.8–8cP liquid viscosity; 3–7dyn∕cm surface tension; 1.1–30kg∕m3 gas density; 0.4–13m slug length)

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Figure 4

Measured slug lengths in upward inclined pipes (subset of Fig. 3)

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Figure 5

Demonstration of the differential pressure method of counting slugs

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