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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Flow of non-newtonian fluids in open channels

Haldenwang, Rainer January 2003 (has links)
Dissertation (DTech (Civil Engineering))--Cape Technikon, Cape Town, 2003 / Flume design for homogeneous non-Newtonian fluids is problematic and not much research has been conducted in this field. This application is industrially important in mining where slurries have to be transported to processing or disposal sites at higher concentrations because water is becoming a scarce and expensive commodity. This thesis addresses the problem of flume design and develops predictive models for the laminar, transitional and turbulent flow behaviour of non-Newtonian fluids in rectangular open channels. The relevant literature pertaining to Newtonian and non-Newtonian pipe and open channel flow is reviewed and research aspects are identified. A unique test facility was designed, constructed and commissioned for this project. The facility includes a 5 m-long by 75 mm-wide rectangular tilting flume, as well as a 10 m by 300 mmwide rectangular tilting flume that can be partitioned to form a 150 mm wide flume. The flumes are in series with an in-line tube viscometer which has tubes of diameter 13, 28 and 80 mm. The experimental investigation covers a wide range of widths (75 mm-300 mm), slopes (1º-5º), flow rates (0.05 l/s-45 l/s), relative densities (1.0067-1.165), volumetric concentrations (0%-10%), and yield stresses (0-21.3 Pa). The fluids tested are kaolin and bentonite slurries and CMC and Carbopol polymer solutions. The resulting database of empirical flow behaviour enabled the identification of the important flow behaviour characteristics. Existing models are compared and evaluated using the experimental database compiled for this thesis and it is concluded that no model exists to predict the database compiled for the various materials from laminar flow through the transition region into turbulence. For the correlation of laminar flow data, a Reynolds number was developed from the Reynolds number proposed for pipe flow by Slatter (1994). Using this Reynolds number, all the laminar flow data available was collapsed onto the 16/Re line on a standard Moody diagram. Criteria were developed to predict the onset of transition and the onset of ‘full turbulence’. These criteria are functions of the Froude and Reynolds number as well as the viscous characteristics of the fluids. These models performed better than the methods proposed by Naik (1983) and Coussot (1994), which were based on the Hanks criterion. A turbulent flow model was developed based on the turbulent model presented by Slatter (1994) for pipe flow. Flow predictions using this model were more accurate than those presented by Torrance (1963), Naik (1983), Wilson and Thomas (1985), and Slatter (1994). The new models were tested with the database compiled for this thesis as well as with two published data sets, one by Naik (1983) and the other by Coussot (1994). The new flow models predicted all the available data within acceptable limits, providing a basis for design. A new and experimentally validated design protocol is presented for the design of rectangular non-Newtonian open channel flow in laminar, transitional and turbulent flow.

Three-dimensional numerical simulation and performance study of an industrial helical static mixer /

Khosravi Rahmani, Ramin. January 2004 (has links)
Dissertation (Ph.D.)--University of Toledo, 2004. / Typescript. "A dissertation [submitted] as partial fulfillment of the requirements of the Doctor of Philosophy degree in Engineering." Bibliography: leaves 323-340.

Laminar Newtonian and non-Newtonian converging flow in conical sections

Sutterby, John LLoyd, January 1964 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1964. / Typescript. Includes abstract (leaf ii) and summary (leaves xxi-xxv). Vita. Description based on print version record. Includes bibliographical references (leaves G-1-G-9).

Investigation of Stokes' second problem for non-Newtonian fluids

Rikhotso, Deals Shaun 12 June 2014 (has links)
The motion of an incompressible fluid caused by the oscillation of a plane at plate of in nite length is termed Stokes' second problem. We assume zero velocity normal to the plate and thus simpli ed Navier-Stokes equations. For the unsteady Stokes' second problem, solutions may be obtained by using Laplace transforms, perturbation techniques, homotopy, di erential transform method or Adomian decomposition method. Stokes' second problem is discussed for second-grade and Oldroyd-B non-Newtonian fluids. This dissertation summarizes previously published work.

An experimental study of combined forced and free convective heat transfer to non-Newtonian fluids in the thermal entry region of a horizontal pipe

Kim, Yong Jin, 1956- 27 April 1990 (has links)
Graduation date: 1990

A theoretical analysis of non-Newtonian flow in wire-coating dies

Astfalk, Gregory, 1948- January 1976 (has links)
No description available.

Phenomonological behaviour of particles in Newtonian and non-Newtonian liquids.

Bartram, Eric. January 1973 (has links)
No description available.

Rheological characterization of high density polyethylene with processing aids in capillary flow and its implications in a non-isothermal annular flow process

Nguyen, Khanh Phuong 08 1900 (has links)
No description available.

Minimum impeller speeds and power requirements for complete dispersion of non-Newtonian liquid-liquid systems in baffled vessels

Kanel, Jeffrey Scott 12 1900 (has links)
No description available.

Non-newtonian conversion of type II emulsion liquid membranes-solving long-standing permeability, stability, and swelling problems

Gilbert, Christopher Donald 12 1900 (has links)
No description available.

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