The heat transfer effects of an isolated longitudinal vortex embedded in a turbulent boundary layer were examined experimentally for vortex circulations ranging from Γ/U∞δ99 = 0.12 to 0.86. The test facility consisted of a two-dimensional boundary-layer wind tunnel, with a vortex introduced into the flow by a half-delta wing protruding from the surface. In all cases, the vortex size was of the same order as the boundary-layer thickness. Heat transfer measurements were made using a constant-heat-flux surface with 160 embedded thermocouples to provide high resolution of the surface-temperature distribution. Three-component mean-velocity measurements were made using a four-hole pressure probe. Spanwise profiles of the Stanton number showed local increases as large as 24 percent and decreases of approximately 14 percent. The perturbation to the Stanton number was persistent to the end of the test section, a length of over 100 initial boundary-layer thicknesses. The weakest vortices examined showed smaller heat transfer effects, but the Stanton number profiles were nearly identical for the three cases with circulation greater than Γ/U∞δ99 = 0.53 cm. The local increase in the Stanton number is attributed to a thinning of the boundary layer on the downwash side of the vortex.
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Heat Transfer Effects of a Longitudinal Vortex Embedded in a Turbulent Boundary Layer
P. A. Eibeck,
P. A. Eibeck
Department of Mechanical Engineering, University of California—Berkeley, Berkeley, CA
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J. K. Eaton
J. K. Eaton
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305
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P. A. Eibeck
Department of Mechanical Engineering, University of California—Berkeley, Berkeley, CA
J. K. Eaton
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305
J. Heat Transfer. Feb 1987, 109(1): 16-24 (9 pages)
Published Online: February 1, 1987
Article history
Received:
April 1, 1985
Online:
October 20, 2009
Citation
Eibeck, P. A., and Eaton, J. K. (February 1, 1987). "Heat Transfer Effects of a Longitudinal Vortex Embedded in a Turbulent Boundary Layer." ASME. J. Heat Transfer. February 1987; 109(1): 16–24. https://doi.org/10.1115/1.3248039
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