Evaluation of hydraulic roughness of stationary deposit in slurry pipes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F10%3A00177382" target="_blank" >RIV/68407700:21110/10:00177382 - 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

Evaluation of hydraulic roughness of stationary deposit in slurry pipes

Popis výsledku v původním jazyce

Sometimes, slurry pipelines are operated at flow velocities low enough to enable stationary bed formation at the bottom of the pipe. In such a case the surface of the deposit affects flow resistance. The frictional pressure drop can be predicted only ifthe hydraulic roughness of the top of the deposit is determined. The fact that the top of the bed is sheared off due to the applied high shear stress makes the determination of the roughness difficult. Recently, the authors proposed an empiricical formula for the hydraulic roughness of an eroded bed. The formula was based on the data available at the time. In 2008, new experiments were carried out for flows of two very different sand fractions in the 100-mm pipe loop of the Institute of Hydrodynamics. The experimental results confirmed that the proposed formula works well within a broad range of grain sizes. The paper discusses the structure of the proposed formula and its validity in the light of the new experimental results.

Název v anglickém jazyce

Evaluation of hydraulic roughness of stationary deposit in slurry pipes

Popis výsledku anglicky

Sometimes, slurry pipelines are operated at flow velocities low enough to enable stationary bed formation at the bottom of the pipe. In such a case the surface of the deposit affects flow resistance. The frictional pressure drop can be predicted only ifthe hydraulic roughness of the top of the deposit is determined. The fact that the top of the bed is sheared off due to the applied high shear stress makes the determination of the roughness difficult. Recently, the authors proposed an empiricical formula for the hydraulic roughness of an eroded bed. The formula was based on the data available at the time. In 2008, new experiments were carried out for flows of two very different sand fractions in the 100-mm pipe loop of the Institute of Hydrodynamics. The experimental results confirmed that the proposed formula works well within a broad range of grain sizes. The paper discusses the structure of the proposed formula and its validity in the light of the new experimental results.

Druh

O - Ostatní výsledky

CEP obor

BK - Mechanika tekutin

OECD FORD obor

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Projekt

<a href="/cs/project/1M0579" target="_blank" >1M0579: Centrum integrovaného navrhování progresivních stavebních konstrukcí</a><br>

Návaznosti

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

Rok uplatnění

2010

Kód důvěrnosti údajů

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