The Limit Deposit Velocity model, a new approach

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Title:The Limit Deposit Velocity model, a new approach
Creators:
Miederma, Sape A.; s dot a dot miedema at tudelft dot nl; Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands.
Ramsdell, Robert C.; Manager Production Department, Great Lakes Dredge & Dock, 2122 York Road, Oak Brook, IL 60523 USA.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 63, 4, pp. 273-286
Uncontrolled Keywords:critical velocity, limit Deposit Velocity, slurry transport, newtonian fluid

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 < δv), small particles from δv–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.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:The Limit Deposit Velocity model, a new approach
Translated title:The Limit Deposit Velocity model, a new approach
Creators:
Miederma, Sape A.; s dot a dot miedema at tudelft dot nl; Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands.
Ramsdell, Robert C.; Manager Production Department, Great Lakes Dredge & Dock, 2122 York Road, Oak Brook, IL 60523 USA.
Uncontrolled Keywords:critical velocity, limit Deposit Velocity, slurry transport, newtonian fluid
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:63
Number:4
Page Range:pp. 273-286
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8491
Item Type:Article
Deposited On:10 Dec 2015 17:53
Last Modified:10 Dec 2015 16:53

Citation

Miederma, Sape A.; Ramsdell, Robert C. (2015) The Limit Deposit Velocity model, a new approach. Journal of Hydrology and Hydromechanics, 63 (4). pp. 273-286. ISSN 0042-790X

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