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Semi-empirical formulae for upper plane bed friction

SYSNO ASEP	0348904
Document Type	C - Proceedings Paper (int. conf.)
R&D Document Type	Conference Paper
Title	Semi-empirical formulae for upper plane bed friction
Author(s)	Krupička, Jan (UH-J)_{SAI, RID} Matoušek, Václav (UH-J)_{ORCID, SAI, RID}
Source Title	Proceedings of the 18th International Conference on Hydrotransport. - Cranfield, Bedforshire : BHR Group, 2010 / Heywood N. - ISBN 978-1-85598-119-5
Pages	s. 95-103
Number of pages	9 s.
Action	International Conference on Hydrotransport /18./
Event date	22.09.2010-24.09.2010
VEvent location	Rio de Janeiro
Country	BR - Brazil
Event type	WRD
Language	eng - English
Country	GB - United Kingdom
Keywords	equivalent roughness ; experiment ; sediment transport ; mobile bed
Subject RIV	BK - Fluid Dynamics
R&D Projects	GA103/09/0383 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z20600510 - UH-J (2005-2011)
Annotation	Friction conditions at the top of a mobile bed are discussed for flows in the upper-plane-bed regime, i.e. for the flows with values of the bed Shields parameter larger than approximately 0.6. A formula that evaluates friction of the top of the mobile bed at high shear stress is an important part of predictive models for layered flows in slurry pipes. Recently proposed semi-empirical formula is validated using experimental data from own tests and from literature. Two alternative formulae are proposed. Their performance is satisfactory as shown on a comparison with experimental data for 16 fractions of solids of different sizes and densities in pressurized pipes of 5 different laboratory circuits.
Workplace	Institute of Hydrodynamics
Contact	Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003
Year of Publishing	2011

Number of the records: 1