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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

THE EFFECTS OF LONGITUDINAL VORTICES EMBEDDED IN A TURBULENT BOUNDARY LAYER ON MOMENTUM AND THERMAL TRANSPORT

Get access (open in a dialog) DOI: 10.1615/IHTC8.600
pages 1115-1120

Аннотация

An experimental investigation of a longitudinal vortex/boundary layer system was made to understand the effects of the vortex on local convective heat transfer coefficients. Measurements in the presence of a single longitudinal vortex embedded in an otherwise two-dimensional turbulent boundary layer included local Stanton number distributions, momentum and thermal boundary layer profiles, and skin friction distributions. The local Stanton number varied, with an increase of 22% over flat plate values in the downwash region of the vortex, and decreases of 12% in the upwash region. The vortex imposed spanwise variations of boundary layer parameters such as thickness, wall shear, and profile shape. In spite of this, the heat transfer process was locally dominated by two-dimensional mechanisms, as evidenced by the existence of a log-region in the boundary-layer, as well as the applicability of the Reynolds analogy.