Velocity Measurements for Turbulent Nonseparated Flow Over Solid Waves
Frederick, Kenneth Arthur
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https://hdl.handle.net/2142/69768
Description
Title
Velocity Measurements for Turbulent Nonseparated Flow Over Solid Waves
Author(s)
Frederick, Kenneth Arthur
Issue Date
1986
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Abstract
Laser-Doppler velocimetry measurements have been made of nonseparated velocity fields over solid sinusoidal wavy surfaces. Time-averaged velocity and turbulent intensity data are given.
The measurements were conducted over waves on the bottom wall of a rectangular channel with a cross section of twenty four by two inches, the two inch dimension being vertical. Two sets of velocity data were obtained at conditions corresponding to flows where linear and nonlinear shear stress responses are observed. The conditions were wave steepnesses 2a/(lamda), and channel Reynolds numbers of 0.03125, 6400 and 0.05, 38,800 respectively. The wavelength of the waves was two inches.
The viscous wall region was of particular interest. Sufficient measurements were taken to give an accurate representation of both the streamwise and normal variations of the viscous wall region. The data was Fourier analyzed to determine the extent of nonlinearities, the wavelength averaged flowfields, and the amplitudes and phases of the velocity responses. The physical meaning of the data is interpreted in terms of pressure gradient effects along the wave surfaces. Comparisons of the data with predictions from simple eddy viscosity models are also given.
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