Deposition limit velocity: effect of particle size distribution

0482337 - ÚH 2018 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Matoušek, Václav - Visintainer, R. - Furlan, J. - McCall, G. - Sellgren, A.
Deposition limit velocity: effect of particle size distribution.
18th International Conference on Transport & Sedimentation of Solid Particles. Prague: Wroclaw University of Environmental and Life Sciences, 2017 - (Sobota, J.; Vlasák, P.; Matoušek, V.), s. 217-224. ISBN 978-83-7717-269-8.
[International Conference on Transport & Sedimentation of Solid Particles /18./. Praha (CZ), 11.09.2017-15.09.2017]
Institucionální podpora: RVO:67985874
Klíčová slova: settling slurry flow * deposit in pipe * four component model * mixture flow experiment
Obor OECD: Fluids and plasma physics (including surface physics)

Industrial settling slurries often consist of particles of very different sizes - the particle size distribution may cover sizes which differ with two orders of magnitude. A broad particle size distribution affects parameters of slurry flow including deposition limit velocity. We present experimental results of the deposition limit velocity collected during a comprehensive experimental campaign testing slurry flows composed of solids of different fractions in the GIW Hydraulic Laboratory in 2016. Four narrow graded fractions (carrier fluid, pseudo-homogeneous, heterogeneous, and stratified) were tested in permutations from the individual components to the complete mixture at various concentrations. The primary experiments were carried out in a 203-mm pipe, and selected corresponding experiments were repeated in a 103-mm pipe. The experimental results show that interactions among components affect the resulting deposition limit velocity in flows of broadly graded settling slurries. The effect of particle size distribution on the deposition limit velocity is not benign. The deposit velocity is not necessarily lower in a flow of slurry composed of four components than in slurry flow of one component with the highest deposit velocity from the four components. We discuss possible modifications of a deposit velocity predictive model in order to take effects of a broad particle size distribution into account.
Trvalý link: http://hdl.handle.net/11104/0279142