Experimental Surface Heat Transfer and Flow Structure in a Curved Channel With Laminar, Transitional, and Turbulent Flows

[+] Author and Article Information
P. M. Ligrani, C. R. Hedlund

Convective Heat Transfer Laboratory, Department of Mechanical Engineering, MEB 2202, 50 S. Central Campus Drive, University of Utah, Salt Lake City, UT 84112-9208

J. Turbomach 126(3), 414-423 (Sep 03, 2004) (10 pages) doi:10.1115/1.1738119 History: Received December 01, 2002; Revised March 01, 2003; Online September 03, 2004
Copyright © 2004 by ASME
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Normalized streamwise mean velocity profiles at three different spanwise locations at De=125 and x/d=219
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Time sequence of 11 smoke visualization photographs and sketches illustrating how one vortex pair may be engulfed by an adjacent vortex pair followed by the emergence of a vortex pair from the near-wall region for De=100 at a streamwise location 105 deg from the start of curvature. Photographs are spaced apart by 1/30 second intervals. The streamwise direction is into the plane of the plot, the concave surface is on the bottom of each photograph, and the convex surface is on the top of each photograph.
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Temporal power spectra of the voltage signals from a hot-wire sensor placed at Y/d=0.5 and Z/d=−12.25 (near an inflow region) at a streamwise location θ=112 deg from the start of curvature. Individual spectra are given for De of 141, 145, 150, and 156 show the fundamental and two harmonic frequencies associated with twisting vortices.
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Variation of the time-averaged magnitude of the square of the longitudinal fluctuating velocity with Dean number De at three different locations across the channel cross section at x/d=219
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Normalized streamwise mean velocity profile at De=401 and x/d=219
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Forced convection Nusselt numbers as dependent upon x/d for Dean numbers of 100, 327, 629, and 905
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Forced convection Nusselt numbers as dependent upon x/d for Dean numbers of 218, 549, 709, 831, 905, and 1084 for the concave and convex channel surfaces
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Photographs of flow visualized using smoke at channel cross sections located at different streamwise locations for a Dean number of 122
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Time-averaged distribution of radial vorticity for De=122, θ=120 deg, and x/d=219. The associated vorticity scale is given below the plot.
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Channel coordinate system and geometry




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