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 Title: Modification of Turbulent Channel Flow by Passive and Additive Devices Author(s): Warholic, Michael David Doctoral Committee Chair(s): Hanratty, Thomas J. Department / Program: Chemical Engineering Discipline: Chemical Engineering Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Engineering, Chemical Abstract: Solutions of surfactants in water can be formulated so that rod-shaped micelles are created, which can reduce the drag over what would be experienced with a Newtonian fluid flowing turbulently at the same rate. A solution of 2000 ppm tallow-(tris-hydroxyethyl)-ammonium acetate (or Ethoquad T/13/50) and sodium salicylate is investigated in this study. The instantaneous streamwise and normal velocity fluctuations were measured using LDV for four different Reynolds numbers; $Re\sb{b}$ = 13300, 19100, 3200, and 49100. For a fixed volumetric flow the pressure drop is reduced by 62 to 76 per cent when compared to a Newtonian flow with an equal wall viscosity. Measurements were made of the mean streamwise velocity, the root-mean-square of the streamwise and normal fluctuating velocities, the Reynolds shear stress, and the spectral density function of the fluctuating velocity in the streamwise direction. (Abstract shortened by UMI.). Issue Date: 1997 Type: Text Language: English Description: 285 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997. URI: http://hdl.handle.net/2142/82446 Other Identifier(s): (MiAaPQ)AAI9812804 Date Available in IDEALS: 2015-09-25 Date Deposited: 1997
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