Flow Pattern and Pressure Drop in Highly Concentrated Slurries Transportation Pipelines

Abstract:

Flow pattern and pressure drop in highly concentrated slurries transportation pipelines were discussed. The particles are settling, and tend to settle down to the bottom of pipes due to the action of gravity force forming different flow patterns which can be indicated by particle concentration profile. Three distinct flow patterns can be observed for different particle size distribution at different velocities: fully stratified, partially stratified and fully suspended flow patterns. As for pressure drop, it is well known that pressure drops in pipeline flows of slurries are strongly dependent on the flow pattern developed in a pipeline. Furthermore, fine particles suspended in water make the water more viscous, and increase the friction. In case of coarse particles, having larger volume, they have the tendency to contact with the pipe wall and with the other coarse particles more times, which increase the friction of flow. Meanwhile, coarse particles are lifted by the pressure difference generated as they rotate in the liquid preventing the coarse particles from settling down which results in less friction. The mixture of particles of different sizes is helpful to reduce pressure drop in pipeline flow slurries. Narrow grading particles tend to have high frictional losses, while broad grading particles have low frictional losses at high concentrations.

• Periodical: Advanced Materials Research (Volume 281)
• Pages: 179-182
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.281.179
• Online since: July 2011
• Authors: Hai Lu, Jun Yin, Yi Xing Yuan, Biao Wang, Hong Wei Chen, Jian Hui Wang
• Keywords: Flow Pattern, Pressure Drop, Slurry, Transporting Pipelines

References

[1] Matousek. Research developments in pipeline transport of settling slurries. Powder Technology. vol. 156, pp.43-51, (2005).

DOI: 10.1016/j.powtec.2005.05.054

[2] Y.S. Fangary, A.S. Abdel ghani, S.M. El haggard, R.A. Williams. The effect of fine particles on slurry transport processes. Minerals Engineering. vol. 10, pp.427-439, (1997).

DOI: 10.1016/s0892-6875(97)00019-8

[3] Matousek. Pressure drops and flow patterns in sand-mixture pipes. Experimental Thermal and Fluid Science. vol. 26, p.693–702, (2002).

DOI: 10.1016/s0894-1777(02)00176-0

[4] K.C. Wilson. Slip point of beds in solid– liquid pipeline flow. Journal of the Hydraulics Division. vol. 96, pp.1-12, (1970).

DOI: 10.1061/jyceaj.0002250

[5] K.C. Wilson, M. Streat, R.A. Bantin. Slip-model correlation of dense two-phase flow. Proc. 2nd Int. Conf. on Hydrotransport. BHRA, Warwick, UK. pp. B1-1-10. (1972).

[6] A.C. Korving. High-concentrated fine-sand slurry flow in pipe-lines: experimental study. 15th Int. Conf. on Hydrotransport. BHRG, Banff, Canada, p.769– 776, (2002).

[7] V. Matousek. Non-stratified flow of sand –water slurries. N. Heywood (Ed. ), Proc. 15th Int. Conf. on Hydrotransport, BHRG, Banff, Canada. p.563–574, (2002).

[8] Xiangjun Fei. Physical characteristics of slurries and the transporting velocity in pipelines. Technology in Pipeline and Equipment. vol. 1, pp.4-8, (2000).

[9] V. Matousek. Partially stratified flow with turbulent suspension in a Pipe. J. Sobota, R. Verhoeven (Eds. ), Proc. 11th Int. Conf. on Transport and Sedimentation of Solid Particles. p.391–398, (2002).

[10] J. Schaan, R.J. Sumner, R.G. Gillies, C.A. Shook. The effect of particle shape on pipeline friction for Newtonian slurries of fine particles. Canadian Journal of Chemical Engineering. vol. 78, p.717– 725, (2000).

DOI: 10.1002/cjce.5450780414

[11] V. Matousek. Distribution and friction of particles in pipeline flow of sand-water mixtures. Handbook of Conveying and Handling of Particulate Solids, Elsevier. p.465–471, (2001).

DOI: 10.1016/s0167-3785(01)80048-8

[12] L. Pullum, L.J.W. Graham. The use of magnetic resonance imaging MRI) to probe complex hybrid suspension flows. J. Sobota (Ed. ), Proc. 10th Int. Conf. on Transport and Sedimentation of SolidParticles, Wroclaw, Poland. p.421–433, (2000).

[13] D.R. Kaushal, Kimihiko Sato, Takeshi Toyota, Katsuya Funatsu, Yuji Tomita. Effect of particle size distribution on pressure drop and concentration profile in pipeline flow of highly concentrated slurry. International Journal of Multiphase Flow, vol. 31. pp.809-823, (2005).

DOI: 10.1016/j.ijmultiphaseflow.2005.03.003

[14] D. R. Kaushal, Yuji Tomita, R. R. Dighade. Concentration at the pipe bottom at deposition velocity for transportation of commercial slurries through pipeline. Powder Technology. Vol. 125, pp.89-101, (2002).

DOI: 10.1016/s0032-5910(02)00031-1

[15] Le Huynh, Paul Jenkins, John Ralston. Modification of the rheological properties of concentrated slurries by control of mineral–solution interfacial chemistry. International Journal of Mineral Processing, vol. 59. pp.305-325., (2000).

DOI: 10.1016/s0301-7516(99)00082-4

[16] Xiangjun Fei. Hydraulics of conveying slurries and granular materials. Tsinghua Press, Beijing, (1994).