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| Description
| - In slurry transport 4 main flow regimes can be distinguished. Considering constant concentration and increasing the flow velocity starting at zero, these are the fixed or stationary bed regime, the sliding bed regime, the heterogeneous regime and the homogeneous regime. Above a certain threshold velocity above the bed, sheet flow will occur, forming a layer of moving particles with an increasing velocity and a decreasing concentration, upwards with respect to the fixed bed. This sheet flow layer changes the apparent bed friction coefficient. Below the threshold velocity it is often assumed that the Darcy-Weisbach friction factor can be determined by using the particle diameter as the bed roughness. However when sheet flow occurs it appears that the roughness to be applied hardly depends on the particle diameter. Many relations have been derived relating the relative roughness to the Shields parameter. Most of these relations have an implicit character and also require derived. The advantage of these relations is, that they may tell more about the internal structure of the flow, the disadvantage is, that they are difficult to apply in head loss equations. The question is now, is it possible to find a reasonable explicit equation, accurate enough to be applied in head loss predictions as used in dredging. Based on original experimental data, two new equations are derived, giving about the same correlation. The first equation gives the Darcy-Weisbach friction factor of the bed as a function of the velocity above the bed, the hydraulic radius, the relative submerged density, the particle diameter and the terminal settling velocity. In the second equation the particle diameter and the terminal settling velocity are omitted. The paper gives an overview of existing bed roughness equations, gives the new explicit equations, relates the data with original experimental data and shows that the new equations correlate well with some of the existing implicit relations.
- In slurry transport 4 main flow regimes can be distinguished. Considering constant concentration and increasing the flow velocity starting at zero, these are the fixed or stationary bed regime, the sliding bed regime, the heterogeneous regime and the homogeneous regime. Above a certain threshold velocity above the bed, sheet flow will occur, forming a layer of moving particles with an increasing velocity and a decreasing concentration, upwards with respect to the fixed bed. This sheet flow layer changes the apparent bed friction coefficient. Below the threshold velocity it is often assumed that the Darcy-Weisbach friction factor can be determined by using the particle diameter as the bed roughness. However when sheet flow occurs it appears that the roughness to be applied hardly depends on the particle diameter. Many relations have been derived relating the relative roughness to the Shields parameter. Most of these relations have an implicit character and also require derived. The advantage of these relations is, that they may tell more about the internal structure of the flow, the disadvantage is, that they are difficult to apply in head loss equations. The question is now, is it possible to find a reasonable explicit equation, accurate enough to be applied in head loss predictions as used in dredging. Based on original experimental data, two new equations are derived, giving about the same correlation. The first equation gives the Darcy-Weisbach friction factor of the bed as a function of the velocity above the bed, the hydraulic radius, the relative submerged density, the particle diameter and the terminal settling velocity. In the second equation the particle diameter and the terminal settling velocity are omitted. The paper gives an overview of existing bed roughness equations, gives the new explicit equations, relates the data with original experimental data and shows that the new equations correlate well with some of the existing implicit relations. (en)
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| Title
| - An Explicit Formulation of Bed Friction Factor for Sheet Flow
- An Explicit Formulation of Bed Friction Factor for Sheet Flow (en)
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| skos:prefLabel
| - An Explicit Formulation of Bed Friction Factor for Sheet Flow
- An Explicit Formulation of Bed Friction Factor for Sheet Flow (en)
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| skos:notation
| - RIV/68407700:21110/14:00226190!RIV15-GA0-21110___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/68407700:21110/14:00226190
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - Slurry Transport; Sheet Flow; Bed Friction; Bed Roughness; Shields (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...v/mistoKonaniAkce
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| http://linked.open...i/riv/mistoVydani
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| http://linked.open...i/riv/nazevZdroje
| - Proceedings of the 15th International Freight Pipeline Society Symposium
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...iv/tvurceVysledku
| - Matoušek, Václav
- Miedema, S. A.
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| http://linked.open...vavai/riv/typAkce
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| http://linked.open.../riv/zahajeniAkce
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| number of pages
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| http://purl.org/ne...btex#hasPublisher
| - Ústav pro hydrodynamiku AV ČR, v.v.i.
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| https://schema.org/isbn
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| http://localhost/t...ganizacniJednotka
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