When self-formed open channels flow at a sufficient gradient or slope, it can generate a certain level of turbulence. The turbulent behaviour of the transportation material can keep the particles in suspension. From our previous study it has been observed that if the slope reduces and the flow rate keeps constant, the intensity of turbulence will decline as well. The mechanism governing particle transportation in turbulent flow has been studied in the past although it not well understood. Limitations on measurements with an opaque fluid result in a less detailed mapping of the fluid velocity in the near wall regions. Therefore a direct numerical simulation approach is required. Direct numerical simulation (DNS) of the turbulent flow of non- Newtonian fluids in an open channel is modelled using a spectral element-Fourier method. The simulation of a yield- pseudoplastic fluid using the Herschel-Bulkley model agrees qualitatively with experimental results from field measurements of mineral tailing slurries. The simulation results over-predict the bulk flow velocity for the cases considered, however the source of the discrepancy is difficult to ascertain. The effect of variation in yield stress is fully investigated and used to assess the sensitivity of the flow to these physical parameters. This methodology is seen to be useful in designing and optimising the transport of slurries in open channels.
|Title of host publication||17th Australasian Fluid Mechanics Conference 2010|
|Number of pages||4|
|Publication status||Published - 2010|
|Event||Australasian Fluid Mechanics Conference 2010 - Auckland New Zealand, Auckland, New Zealand|
Duration: 5 Dec 2010 → 9 Dec 2010
Conference number: 17th
|Conference||Australasian Fluid Mechanics Conference 2010|
|Abbreviated title||AFMC 2010|
|Period||5/12/10 → 9/12/10|
|Other||The Australasian Fluid Mechanics Conference has grown steadily from its beginning at the University of Western Australia in 1962. The conference series has traditionally covered the broad field of fluid mechanics in all engineering and scientific disciplines. It provides a forum for presentation of papers in all aspects of fundamental and applied fluid mechanics.|
Proceedings of the 17th Australasian Fluid Mechanics Conference 5-9th December 2010 was edited by Prof. G.D. Mallinson and Dr J.E. Cater and published by the Faculty of Engineering in association with the Centre for Continuing Education The University of Auckland.