Time Resolved Concentration Measurements in an Axial Flow Mixer

[+] Author and Article Information
J. E. Campbell, R. W. Coppom, J. E. Guilkey, J. C. Klewicki, P. A. McMurtry

Physical Fluid Dynamics Laboratory, Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112

J. Fluids Eng 126(6), 981-989 (Mar 11, 2005) (9 pages) doi:10.1115/1.1845491 History: Received August 11, 2003; Revised July 24, 2004; Online March 11, 2005
Copyright © 2004 by ASME
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Probability density function of concentration at last measurement station (x/D=120.1). Scaled by the rms
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Normalized scalar variance versus x/D on log-linear coordinates
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Normalized scalar variance versus x/D on log-log coordinates
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Centerline concentration time series for VR=1.0, plotted for increasing x/D. (Note change of scale with x/D)
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Flow facility schematic
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Custom LIF sensor schematic
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Typical calibration curve for the seven sensors employed
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Flow visualization showing the rapid transition from coherent jet to the break-up region. Rd=1550
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Flow visualization showing reduced coherent core region. Rd=3130
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Probability density function of concentration. VR=0.5
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Probability density function of concentration. VR=1.0
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Probability density function of concentration. VR=2.0
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Skewness of the concentration fluctuations plotted as a function of x/D
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Kurtosis of the concentration fluctuations plotted as a function of x/D
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Concentration power spectral densities as a function of x/D. Development in the far field reveals indicates the depletion of spectral intensity at midrange frequencies owing to spectral transfer to both higher and lower frequencies
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Concentration time series of sensors 6 and 7. Note the same y-scale windows size, but different ranges, as well as the shifted time range (x axis)
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Correlation plots between sensors 6-7, 5-7, 5-6, and 1-4



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