An Explicit Formulation of Bed Friction Factor for Sheet Flow

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F14%3A00226190" target="_blank" >RIV/68407700:21110/14:00226190 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

An Explicit Formulation of Bed Friction Factor for Sheet Flow

Popis výsledku v původním jazyce

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 changesthe 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 adva

Název v anglickém jazyce

An Explicit Formulation of Bed Friction Factor for Sheet Flow

Popis výsledku anglicky

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 changesthe 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 adva

Druh

D - Stať ve sborníku

CEP obor

BK - Mechanika tekutin

OECD FORD obor

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Projekt

<a href="/cs/project/GAP105%2F12%2F1082" target="_blank" >GAP105/12/1082: Modelování intenzivního chodu splavenin za povodňových průtoků</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 15th International Freight Pipeline Society Symposium

ISBN

978-80-87117-12-5

ISSN

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e-ISSN

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Počet stran výsledku

16

Strana od-do

344-359

Název nakladatele

Ústav pro hydrodynamiku AV ČR, v.v.i.

Místo vydání

Praha

Místo konání akce

Praha

Datum konání akce

24. 6. 2014

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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