Modification of Turbulent Channel Flow by Passive and Additive Devices

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.).

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Chemical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Warholic, Michael David

Contributors dc:contributor

• Hanratty, Thomas J.

• Engineering, Chemical

Language dc:language

eng

Identifier

(MiAaPQ)AAI9812804

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/82446