Authors: Fraser, C; Goosen, P

Open access courtesy of:

Cite As:
Fraser, C & Goosen, P 2019, 'Evaluation of a non-Newtonian two-layer model for high concentration suspensions', in AJC Paterson, AB Fourie & D Reid (eds), Proceedings of the 22nd International Conference on Paste, Thickened and Filtered Tailings, Australian Centre for Geomechanics, Perth, pp. 531-539.

Download citation as:   ris   bibtex   endnote   text   Zotero


Abstract:
High concentration thickened tailings slurries that appear to be homogeneous mixtures often contain coarse particles that settle in the pipeline under laminar flow conditions. During pipeline transport, these coarse particles may eventually settle to the pipe invert. Frequently, these high concentration suspensions are misclassified as homogeneous slurries, leading to the use of incorrect models for predicting the pressure gradient and flow behaviour. This paper discusses the use of a non-Newtonian two-layer model to predict the pressure gradient of a high concentration suspension with a sliding bed in laminar flow conditions. The success of the model is measured by comparing the results obtained by applying the model to experimental results for a typical iron ore tailings slurry. It was found that the model predicted the laminar flow pressure gradient with less than 10% error for slurries with carrier fluid yield stresses above 10 Pa.

Keywords: high concentration suspensions, laminar, pressure gradient, two-layer, pipe flow

References:
Cooke, R 2002, ‘Laminar flow settling: the potential for unexpected problems’, Proceedings of the 15th International Conference on Slurry Handling and Pipeline Transport, BHR Group, Cranfield, pp. 121–133.
Gillies, RG, Hill, KB, McKibben, MJ & Shook, CA 1999, ‘Solids transport by laminar Newtonian flows’, Journal of Powder Technology, vol. 104, pp. 269–277.
Graham, L, Hamilton, R, Rudman, M, Strode, P & Pullum, L 2002, ‘Coarse solids concentration profiles in laminar pipe flows’, Proceedings of the 15th International Conference on Slurry Handling and Pipeline Transport, BHR Group, Cranfield,
pp. 149–158.
International Organization for Standardization 1993, ISO 3219: Plastics - Polymers/Resins in the Liquid State or as Emulsions or Dispersions - Determination of Viscosity Using a Rotational Viscometer with Defined Shear Rate, International Organization for Standardization, Geneva.
Pullum, L & Graham, L 2000, ‘The use of magnetic resonance imaging (MRI) to probe complex hybrid suspension flows’, Proceedings of the 10th International Conference on Transport and Sedimentation of Solid Particles, Wrocław University of Environmental and Life Sciences, Wrocław, pp. 421–433.
Pullum, L, Graham, L & Slatter, P 2004, ‘A non-Newtonian two-layer model and its application to high density hydrotransport’, Proceedings of the 16th International Conference on Slurry Handling and Pipeline Transport, BHR Group, Cranfield,
pp. 579–594.
Sellgren, A & Wilson, KC 2007, ‘Validation of a four-component pipeline friction-loss model’, Proceedings of the 17th International Conference on Slurry Handling and Pipeline Transport, BHR Group, Cranfield, pp. 193–204.
Talmon, A & Mastbergen, D 2004, ‘Solids transport by drilling fluids: Concentrated bentonite-sand-slurries’, Proceedings of the 12th International Conference on Transport and Sedimentation of Solid Particles, Wrocław University of Environmental and Life Sciences, Wrocław, pp. 641–649.
Talmon, A, van Kesteren, W, Mastbergen, D, Pennekamp, J & Sheets, B 2014, ‘Calculation methodology for segregation of solids in non-Newtonian carrier fluids’, in RJ Jewell, AB Fourie, PS Wells & D van Zyl (eds), Proceedings of the 17th International Seminar on Paste and Thickened Tailings, InfoMine Inc., Vancouver, pp. 139–153.
Thomas, AD 1999, ‘The influence of coarse particles on the rheology of fine particle slurries’, Proceedings of Rheology in the Mining Industry II, United Engineering Foundation.
Thomas, AD, Pullum, L & Wilson, KC 2004, ‘Stabilised laminar slurry flow: review, trends and prognosis’, Proceedings of the 16th International Conference on Slurry Handling and Pipeline Transport, BHR Group, Cranfield, pp. 701–716.
Wilson, KC 1976, ‘A unified physically based analysis of solid-liquid pipeline flow’, Proceedings of the 4th International Conference on Hydrotransport of Solids in Pipes, British Hydromechanics Research Association, Cranfield, paper A1, pp. 1–16.




© Copyright 2019, Australian Centre for Geomechanics (ACG), The University of Western Australia. All rights reserved.
Please direct any queries or error reports to repository-acg@uwa.edu.au