Print Email Facebook Twitter The Limit Deposit Velocity model: A new approach Title The Limit Deposit Velocity model: A new approach Author Miedema, S.A. Ramsdell, R.C. Faculty Mechanical, Maritime and Materials Engineering Department Marine and Transport Technology Date 2015-10-20 Abstract In slurry transport of settling slurries in Newtonian fluids, it is often stated that one should apply a line speed above a critical velocity, because blow this critical velocity there is the danger of plugging the line. There are many definitions and names for this critical velocity. It is referred to as the velocity where a bed starts sliding or the velocity above which there is no stationary bed or sliding bed. Others use the velocity where the hydraulic gradient is at a minimum, because of the minimum energy consumption. Most models from literature are one term one equation models, based on the idea that the critical velocity can be explained that way. Here the following definition is used: The critical velocity is the line speed below which there may be either a stationary bed or a sliding bed, depending on the particle diameter and the pipe diameter, but above which no bed (stationary or sliding) exists, the Limit Deposit Velocity (LDV). The way of determining the LDV depends on the particle size, where 5 regions are distinguished. These regions for sand and gravel are roughly; very small particles up to 0.014–0.040 mm (d < ?v), small particles from ?v–0.2 mm, medium particles in a transition region from 0.2–2.00 mm, large particles > 2 mm and very large particles > 0.015·Dp. The lower limit of the LDV is the transition between a sliding bed and heterogeneous transport. The new model is partly based on physics and correlates well with experiments from literature. Subject critical velocityLimit Deposit Velocityslurry transportNewtonian fluid To reference this document use: http://resolver.tudelft.nl/uuid:172294eb-8a1d-4894-8f65-4cfb62432723 Publisher De Gruyter Open ISSN 0042-790X Source https://doi.org/10.1515/johh-2015-0034 Source Journal of Hydrology and Hydromechanics, 63 (4), 2015 Part of collection Institutional Repository Document type journal article Rights © 2015 The Author(s)Distributed under the terms of the Creative Commons Attribution 4.0 Public License (CC BY 4.0) Files PDF 322565.pdf 674.55 KB Close viewer /islandora/object/uuid:172294eb-8a1d-4894-8f65-4cfb62432723/datastream/OBJ/view