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Research Papers: Multiphase Flows

Experimental Characterization of Slug Flow on Solid Particle Transport in a 1 Deg Upward Inclined Pipeline

[+] Author and Article Information
Afshin Goharzadeh

e-mail: agoharzadeh@pi.ac.ae

Liang Wang

Department of Mechanical Engineering,
The Petroleum Institute,
Abu Dhabi 2533, United Arab Emirates

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 8, 2012; final manuscript received April 4, 2013; published online June 5, 2013. Assoc. Editor: Mark R. Duignan.

J. Fluids Eng 135(8), 081304 (Jun 05, 2013) (6 pages) Paper No: FE-12-1503; doi: 10.1115/1.4024272 History: Received October 08, 2012; Revised April 04, 2013

This paper presents an experimental investigation on the influence of hydraulic and two phase (gas-liquid) flows on sand dune transportation resulting from a stationary flatbed, for horizontal and 1 deg upward pipe inclination. For gas-liquid conveying of solid particles, pipe inclination resulted in considerably different transport phenomena relative to those observed for horizontal orientation. Key distinguishing features such as backward bed movement and enhanced particle suspension were observed and were found to be highly gas-liquid ratio dependent. Using image processing, the solid particle suspension layer was quantified as a function of the gas-liquid flow. The measurements presented provide fundamental insights into the influence of upward pipe inclination on bed-load mode solid transportation in a closed conduit.

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Figures

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Fig. 2

Flow regime map derived from visualized flow fields for hydraulic convey of solid particle flow in horizontal and inclined pipes

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Fig. 1

Processing of CCD-captured flow field images of three phase flow (Q1 = 1.0 l/min, Qg = 7.5 l/min, h0 = 5.3 mm, α = 1 deg). (a) Original CCD-captured image (field of view 128 × 24 mm2), (b) Gray-scale image processed from (a), (c) Light intensity profile extracted from processed image in, (b) at the indicated normal analysis plane.

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Fig. 3

Multiphase flow regime map derived from visualized flow fields for gas-liquid hydraulic convey of solid particle flow in horizontal pipes

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Fig. 4

Visualized gas-liquid conveying of solid particles in inclined pipe flow (Q1 = 1.0 l/min, Qg = 7.5 l/min, h0 = 5.3 mm, α = 1 deg). (a) Forward moving sand bed (slug section, field of view 128 × 24 mm2), (b) Stationary sand bed (film front), (c) Backward moving sand bed (film section), (d) Enhanced particle suspension (slug front).

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Fig. 5

Light intensity profile for normal analysis planes B and B′ indicated in Figs. 4(a) and 4(d), respectively (Q1 = 1.0 l/min, Qg = 7.5 l/min, h0 = 5.3 mm, α = 1 deg).

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Fig. 6

Comparison of light intensity profiles along normal analysis planes A, B′, and C in Fig. 4(d), (Q1 = 1.0 l/min, Qg = 7.5 l/min, h0 = 5.3 mm, α = 1 deg).

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Fig. 7

Gas-liquid conveying of solid particles in inclined pipe flow (Q1 = 3.0 l/min, Qg = 3.5 l/min, h0 = 8.7 mm, α = 1 deg). (a) Forward moving sand dune (slug section, field of view 128 × 24 mm2), (b) Stationary sand dune (film front), (c) Backward moving sand dune (film section), (d) Enhanced dune motion and particle suspension (slug front).

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Fig. 8

Light intensity profile for normal analysis planes indicated in Figs. 7(a) and 7(d), (Q1 = 3.0 l/min, Qg = 3.5 l/min, h0 = 8.7 mm, α = 1 deg)

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