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Research Papers: Forced Convection

Effect of Upstream Shear on Flow and Heat (Mass) Transfer Over a Flat Plate—Part II: Mass Transfer Measurements

[+] Author and Article Information
K. Ghosh

Department of Mechanical Engineering, Heat Transfer Laboratory, University of Minnesota, Minneapolis, MN 55455kalmech@me.umn.edu

R. J. Goldstein1

Department of Mechanical Engineering, Heat Transfer Laboratory, University of Minnesota, Minneapolis, MN 55455rjg@me.umn.edu

1

Corresponding author.

J. Heat Transfer 132(10), 101702 (Aug 03, 2010) (6 pages) doi:10.1115/1.4001609 History: Received April 16, 2009; Revised April 01, 2010; Published August 03, 2010; Online August 03, 2010

Mass transfer measurements on a flat plate downstream of a belt moving in the same direction of the freestream study the effect of the upstream shear on the heat (mass) transfer for four belt-freestream velocity ratios. With an increase in this ratio, the “virtual origin” of the turbulent boundary layer “moves” downstream toward the trailing edge of the belt. This is verified from the variation of the Stanton number versus the Reynolds number plots. As the “inner” region of the boundary layer is removed for a belt speed of uw=10m/s (freestream velocity uin15.4m/s), a corresponding local minimum in the variation of the Stanton number is observed. Downstream of this minimum, the characteristics of the turbulent boundary layer are restored and the data fall back on the empirical variation of Stanton with Reynolds number.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 3

Distribution of Stanton number (run 1)

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Figure 4

Effect of modified virtual origin on the variation of Stanton number (runs 4–6)

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Figure 5

Effect of modified virtual origin on the variation of Stanton number (runs 7–9)

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Figure 6

Variation of Stanton number (run 7)

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Figure 1

Mass transfer experimental setup

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Figure 2

LVDT calibration and mock test

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