Particle transportation in turbulent non-Newtonian suspensions in open channels

Guang, Y 2011, Particle transportation in turbulent non-Newtonian suspensions in open channels, Doctor of Philosophy (PhD), Civil, Environmental and Chemical Engineering, RMIT University.


Document type: Thesis
Collection: Theses

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Title Particle transportation in turbulent non-Newtonian suspensions in open channels
Author(s) Guang, Y
Year 2011
Abstract The turbulent behaviour of non-Newtonian suspensions in open channel conditions is investigated here. There is a lack of fundamental understanding of the mechanisms involved in the transport of suspension particles in non-Newtonian fluids, hence direct numerical simulation into the research is a useful validation tool. A better understanding of the mechanism operating in the turbulent flow of non-Newtonian suspensions in open channel would lead to improved design of many of the systems used in the mining and mineral processing industries. Direct numerical simulation (DNS) of the turbulent flow of non-Newtonian fluids in an open channel has been modelled using a spectral element-Fourier method. The simulation of a yield–pseudoplastic fluid using the Herschel-Bulkley model agreed qualitatively with experimental results from field measurements of mineral tailing slurries. The effect of variation of the flow behaviour index has been investigated and used to assess the sensitivity of the flow to this physical parameter. This methodology is seen to be useful in designing and optimising the transport of slurries in open channels.

The aim of this work is to understand the underlying phenomena and mechanisms operating in the turbulent flow of non-Newtonian suspensions in open channels, in particular their ability to transport suspended particles. It is intended to achieve the following objectives: • Demonstrate how the rheological characteristics of the continuous medium carrier fluid influence the transport of solid particles in the suspension • Carry out modification of existing computational model to describe the non-Newtonian open channel flow and validate by experimental measurements • Establish relationships between rheology of the fluid and turbulent characteristics of the flow • Establish relationships between rheology of the fluid and particle suspension in an open channel flow This study of non-Newtonian suspension flow in open channel will provide fundamental information for understanding the behaviour of fluid structure and the relationship between fluid and particles. This information will also be applicable to the design and operation of industrial channels for the transport of mineral suspensions leading to improved channel management and economic outcomes.

Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Civil, Environmental and Chemical Engineering
Keyword(s) Non-Newtonian fluid
turbulent flow
open channel flow
particle transportation
direct numerical simulation
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