The 19th International Conference on Transport & Sedimentation of Solid Particles will be held in Cape Town from 24 - 27 September 2019. The Cape Town Hotel School, situated close to the popular V&A Waterfront precinct, will be the venue.
The conference has become a place for scientists, engineers and leading authorities in the field of pipeline transport and sedimentation, to meet and participate in active debates. The conferences have supported an international exchange of developments in research and applications in these fields.
Paterson & Cooke will be presenting the following papers:
SENSITIVITY OF NON-NEWTONIAN SLURRY VISCOUS PROPERTIES TO TEMPERATURE
Brian Zengeni, Dakalo Nekhavhambe, Peter Goosen
Abstract: There appears to be very limited research into the effect of temperature on the viscous properties on non-Newtonian mineral slurries. Understanding the influence of temperature on slurry viscosity and yield stress is of relevance to situations where slurries are transported at elevated temperate, for example autoclave circuits for mineral extraction, operated at temperatures in the order of 200 degrees C (and elevated pressure) and the tailings from this process (slurry temperatures in the order of 70 degrees C.
Variations in yield stress and viscosity (due to temperature) could have an impact on parameters such as deposition velocity, laminar-turbulent transition velocity and pipeline friction pressure gradients. This paper presents a review of literature on the subject, and then presents the results of an experimental investigation into the effect of temperature on the rheology of a typical non-Newtonian suspension.
ASSESSMENT OF A TWO-LAYER MODEL FOR LAMINAR PIPE FLOW OF SLURRIES COMPRISING A COARSE FRACTION IN NON-NEWTONIAN CARRIER FLUID
Rene Nsanzubuhoro, Bonang Maja, Melchior Stander, Peter Goosen
Abstract: It has been well demonstrated in the literature that slurries comprising a viscous carrier fluid plus coarse solids fraction segregate under laminar pipe flow conditions. Velocity and concentration distributions in the pipeline are non-symmetrical, with the coarse solids concentrated in a lower layer, with a particle-lean upper layer above. Laminar flow friction pressure gradient versus velocity plots for these flow conditions follow the general appearance of homogeneous laminar flow. However, the segregated, non-symmetrical flow has a significant effect on the friction pressure gradient. In this paper the authors evaluate the performance of a two-layer laminar flow model against measured laminar flow pressure gradient data for kaolin plus sand slurries published by Kabengele et al (2012).
The model is based primarily on the work of Pullum et al (2004) as previously described by Fraser & Goosen (2019) and incorporating the concept of a “gelled bed” condition as described by Talmon et al (2004).
To find out more about this conference and to book your place please visit the T&S website