Title: Non-Newtonian thickened tailings slurry flow through open channels
Authors: Sadegh Javadi; Rahul Gupta; Paul Slatter; Sati Bhattacharya
Addresses: Rheology and Materials Processing Centre, RMIT University, 124 La Trobe St., Melbourne, VIC 3000, Australia ' Rheology and Materials Processing Centre, RMIT University, 124 La Trobe St., Melbourne, VIC 3000, Australia ' Rheology and Slurry Engineering Group, ATC Williams, 222 Beach Rd., Mordialloc, VIC 3195, Australia ' Rheology and Materials Processing Centre, RMIT University, 124 La Trobe St., Melbourne, VIC 3000, Australia
Abstract: Flow of non-Newtonian thickened tailings suspensions is experimentally studied. The testwork was carried out with typical mining tailings and kaolin suspensions of varying concentration in the laminar, transitional and turbulent regimes. The experimental investigation used a 100-mm wide and 4.8-m long rectangular channel which was geometrically and dynamically similar to a full-scale industrial channel. It is shown that, contrary to the previous findings, the critical Reynolds number, at which the flow conditions change from the laminar to transitional, can be as high as that for the Newtonian fluids (2000-3000). Nevertheless, the results still support the argument that with an increase in the apparent viscosity, the transitional flow emerges at lower Reynolds number. In addition, the current study experimental results along with previously published data-sets (Burger, 2014; Haldenwang and Slatter, 2006) are used to validate various open channel design models using combined Root-Sum-Square (RSS) values.
Keywords: non-Newtonian; thickened tailings; open channel.
International Journal of Mining and Mineral Engineering, 2017 Vol.8 No.4, pp.310 - 333
Received: 16 Sep 2016
Accepted: 16 May 2017
Published online: 13 Nov 2017 *