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Technical Briefs

Experimental Measurement of Laminar Axisymmetric Flow Through Confined Annular Geometries With Sudden Inward Expansion

[+] Author and Article Information
Afshin Goharzadeh

Department of Mechanical Engineering, The Petroleum Institute, P.O. Box 2533, Abu Dhabi, United Arab Emiratesagoharzadeh@pi.ac.ae

Peter Rodgers

Department of Mechanical Engineering, The Petroleum Institute, P.O. Box 2533, Abu Dhabi, United Arab Emirates

J. Fluids Eng 131(12), 124501 (Nov 12, 2009) (4 pages) doi:10.1115/1.4000482 History: Received November 24, 2008; Revised October 02, 2009; Published November 12, 2009; Online November 12, 2009

In this paper, separating and reattaching aqueous laminar flows produced by a sudden inward expansion within confined annular geometries are experimentally studied. The test geometries are based on a previous numerical study. The fluid flow structure at the expansion region is experimentally characterized using particle image velocimetry combined with refractive index matching. The detailed measurements of the velocity field, reattachment length, and relative eddy intensity are obtained for two different expansion ratios, 1.4 and 1.6. For both expansion ratios, the reattachment length is found to vary nonlinearly with the Reynolds number (50<Re<600), in line with numerical predictions. The eddy intensity is found to depend strongly on both the Reynolds number and expansion ratio with the relationship between the Reynolds number and the reattachment length being nonlinear. Overall, the corresponding numerical predictions are in good agreement with the measurements undertaken herein.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Physical geometry of experimental setup

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Figure 2

Experimental setup: (a) schematic of experimental setup and (b) flow visualization system

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Figure 3

Velocity flow field measurements: (a) typical PIV recorded image at expansion region, (b) flow field measurement Re=100, (c) flow field measurement Re=300, and (d) flow field measurement Re=500

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Figure 4

Comparison of measured and analytically predicted velocity profile at the upstream end of the inlet annulus (R and L refer to right and left sides, respectively)

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Figure 5

Comparison of measured and numerically predicted reattachment lengths (h=r2−r3)

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Figure 6

Comparison of measured and predicted eddy intensity (ξ) as function of expansion ratio and Reynolds number

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