Hydraulic behaviour of nuclear waste flows

Biggs, S. R., Fairweather, M., Harbottle, D., Lin, B. and Peakall, J. (2009). Hydraulic behaviour of nuclear waste flows. In: Proceedings of the 12Th International Conference On Environmental Remediation and Radioactive Waste Management 2009, Vol 1. 12th International Conference on Environmental Remediation and Radioactive Waste Management, Liverpool England, (345-352). Oct 11-15, 2009. doi:10.1115/ICEM2009-16376

Author Biggs, S. R.
Fairweather, M.
Harbottle, D.
Lin, B.
Peakall, J.
Title of paper Hydraulic behaviour of nuclear waste flows
Conference name 12th International Conference on Environmental Remediation and Radioactive Waste Management
Conference location Liverpool England
Conference dates Oct 11-15, 2009
Proceedings title Proceedings of the 12Th International Conference On Environmental Remediation and Radioactive Waste Management 2009, Vol 1
Publisher ASME
Publication Year 2009
Sub-type Fully published paper
DOI 10.1115/ICEM2009-16376
Open Access Status DOI
ISBN 978-0-7918-4407-6
Start page 345
End page 352
Total pages 8
Language eng
Formatted Abstract/Summary
A great deal of existing nuclear waste is stored as a solid-liquid slurry, and the effective transportation of such systems is an essential element in the successful implementation of almost all waste treatment strategies involving particulate wastes within the nuclear industry. A detailed knowledge of turbulent, particle-laden liquid flow behaviour is therefore obviously important. However, systematic and detailed studies of solid-liquid flows by experimental investigation are still limited for pipe flows, contrary to the significant amount of work available for channel flows. Research is therefore required to understand the effects of physical parameters, such as particle shape, size and size distribution, and solids concentration, on the properties of solid-liquid systems, particularly in horizontal pipe flows where particles may settle out of the flow and form solid beds which can potentially lead to pipe blockages. The presence of particles in a turbulent pipe flow also modifies the characteristics of the flow, thereby changing its ability to maintain particles in suspension The work described concerns pipe flows over a Reynolds number range of 1,000-10,000, with varying levels of solids concentration within the flow. Measurements of the flow and particle characteristics have been gathered using particle image velocimetry (PIV) and, for high solids concentrations, ultrasound Doppler velocity profiling (UDVP) techniques. This work has demonstrated that the intensity of turbulence within such flows can be significantly affected by the presence of solid particles, with small particles generally attenuating turbulence levels, while large particles often augment turbulence levels from the pipe centre-line to the near-wall region. In addition, the coagulation of particles into larger agglomerates is also of importance, with data demonstrating that whilst turbulence levels are influenced and augmented by such agglomerates at low Reynolds numbers, high turbulence levels at high Reynolds numbers can destroy the agglomerates and reduce their effect on the carrier fluid. Work has also been undertaken to examine the effect of particle size and Reynolds number on particle deposition within the flows, and also to establish the minimum transport velocity required to re-suspend particles from solid beds. All these findings are of importance in enhancing our understanding of flows of particles in pipes which in turn is of value in enabling the design of cost effective and efficient waste treatment processes.
Keyword Pipe
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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