About: Evaluation of hydraulic roughness of stationary deposit in slurry pipes

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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 if the 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. 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 if the 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. (en)
Title	Evaluation of hydraulic roughness of stationary deposit in slurry pipes Evaluation of hydraulic roughness of stationary deposit in slurry pipes (en)
skos:prefLabel	Evaluation of hydraulic roughness of stationary deposit in slurry pipes Evaluation of hydraulic roughness of stationary deposit in slurry pipes (en)
skos:notation	RIV/68407700:21110/10:00177382!RIV13-MSM-21110___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(1M0579)
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Matoušek, Václav Krupička, Jan
http://linked.open.../riv/druhVysledku	O - Ostatní výsledky nezařaditelné do žádného z výše uvedených druhů výsledku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	České vysoké učení technické v Praze / Fakulta stavební
http://linked.open...dnocenehoVysledku	257853
http://linked.open...ai/riv/idVysledku	RIV/68407700:21110/10:00177382
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	bed shear; experiment; hydraulic transport; sediment transport (en)
http://linked.open.../riv/klicoveSlovo	hydraulic transport experiment sediment transport bed shear
http://linked.open...ontrolniKodProRIV	[B4DF980EB983]
http://linked.open...in/vavai/riv/obor	BK
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Centre for Integrated Design of Advanced Structures
http://linked.open...UplatneniVysledku	2010
http://linked.open...iv/tvurceVysledku	Krupička, Jan Matoušek, Václav
http://localhost/t...ganizacniJednotka	21110

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