Počet záznamů: 1

Semi-empirical formulae for upper plane bed friction

  1. 1.
    0348904 - UH-J 2011 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
    Krupička, Jan - Matoušek, Václav
    Semi-empirical formulae for upper plane bed friction.
    Proceedings of the 18th International Conference on Hydrotransport. Cranfield, Bedforshire: BHR Group, 2010 - (Heywood, N.), s. 95-103. ISBN 978-1-85598-119-5.
    [International Conference on Hydrotransport /18./. Rio de Janeiro (BR), 22.09.2010-24.09.2010]
    Grant CEP: GA ČR GA103/09/0383
    Výzkumný záměr: CEZ:AV0Z20600510
    Klíčová slova: equivalent roughness * experiment * sediment transport * mobile bed
    Kód oboru RIV: BK - Mechanika tekutin

    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.
    Trvalý link: http://hdl.handle.net/11104/0189296