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Technical Briefs

Mean Concentration Field of a Jet in a Uniform Counter-Flow

[+] Author and Article Information
Luis A. Torres, Brian A. Fleck, David J. Wilson, David Nobes

 Department of Mechanical Engineering,University of Alberta,Edmonton, Alberta, Canada T6G2G8

Mohammad Mahmoudi1

 Department of Mechanical Engineering,University of Alberta,Edmonton, Alberta, Canada T6G2G8mo12@ualberta.ca

1

Corresponding author.

J. Fluids Eng 134(1), 014502 (Feb 24, 2012) (5 pages) doi:10.1115/1.4005689 History: Received February 02, 2011; Revised October 20, 2011; Published February 23, 2012; Online February 24, 2012

An experimental investigation of the scaling factors of mean scalar concentration field of jets issuing into a uniform counter-flow stream is presented. The centerline decay and radial spreading of the mean concentration field were measured by using planar laser induced fluorescence. Jet to counter-flow velocity ratios ranging between 4 to19 were investigated for two different jet diameters. The 5% contour of the mean concentration field of the jet was used to define new scaling factors that generate universal forms for the centerline concentration decay. The jet growth rate in the radial direction was found to be divided into two regions where a linear growth was observed and a region characterized by a power law. Empirical expressions are introduced which predict concentration decay in the established flow region in both the axial and radial directions.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 8

The concentration width of the counter-flowing jet at different Ur , linear growth region (dashed line) and the power law region (dash-dotted line)

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Figure 7

Radial concentration profiles at Ur  = 14, normalized with y1/2 and y1/e

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Figure 6

Centerline concentration profiles scaled by x1/e (open symbols correspond to D1 and the crossed symbols to D2 )

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Figure 5

Centerline concentration profiles, using λ and β as the scale factors (open symbols correspond to D1 and the crossed symbols to D2 )

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Figure 4

Centerline concentration decay using xp /D as the length scale

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Figure 3

Mean centerline concentration dilution (dashed line is 0.25 slope found by Ref. [8] and solid line is 0.3 slope found in this study)

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Figure 2

Definition of the length parameters measured using the 5% concentration contour

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Figure 1

The schematic of the flow facility and experimental setup

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