Higher Order Turbulence
Products of Velocity and Temperature for Adverse Pressure
Gradient Boundary Layer Flows
Bruce R. White and Dae-Seong Kim
Department
of Mechanical and Aeronautical Engineering
University
of California, Davis
Alberto Ayala
Department
of Mechanical and Aerospace Engineering
West Virginia University
Nader Bagheri
Department
of Mechanical Engineering
California Maritime Academy, California State University
Abstract
Higher-order turbulent products of momentum and
temperature are experimentally presented for heated boundary layers subjected
to adverse pressure gradient (APG) and zero pressure gradient (ZPG) flows.
Clauser’s equilibrium parameter, b, was set to 1.8 for APG
case and 0 for ZPG case. The temperature difference between the heated wall and
free stream was held constant at 12°C. Triple wire measurements were conducted to acquire
simultaneous fluctuations of the two turbulent velocity components (u’ and v’) and
the fluctuation of temperature (T’). Findings in this study show pressure
gradient effect on the higher-order products, which tend to be dependent on
large scale coherent structure of the boundary layer turbulence, to enhance
vertical diffusion of stress, suppress stream-wise transport of stress, and
increase structure sizes.
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