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The Transitional Backward-Facing Step Flow in a Water Channel with Variable Expansion Geometry

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    0376600 - UCHP-M 2013 RIV US eng J - Journal Article
    Tihon, Jaroslav - Pěnkavová, Věra - Havlica, Jaromír - Šimčík, Miroslav
    The Transitional Backward-Facing Step Flow in a Water Channel with Variable Expansion Geometry.
    Experimental Thermal and Fluid Science. Roč. 40, JUL (2012), s. 112-125. ISSN 0894-1777
    R&D Projects: GA ČR GA104/07/1110; GA ČR GAP101/11/0806
    Institutional research plan: CEZ:AV0Z40720504
    Keywords : backward-facing step flow * wall shear stress * flow forcing
    Subject RIV: CI - Industrial Chemistry, Chemical Engineering
    Impact factor: 1.595, year: 2012

    The backward-facing step flow is investigated experimentally and numerically at moderate Reynolds numbers. The different channel expansion ratios (ER = 1.4, 2, 2.5, and 4) and inlet flow conditions (steady and pulsatile) are applied with the aim to analyze the structure and stability of the flow behind the step. The electrodiffusion technique is used to measure the wall shear rate along the experimental water channel. The direction sensitive sensors detect the near-wall extent of different flow-recirculation regions (the primary recirculation, the secondary corner, roof, and bottom eddies). The results of 2D numerical simulations performed in commercial CFD software FLUENT provide additional information on the global flow rearrangement caused by the change of operation parameters.
    Permanent Link: http://hdl.handle.net/11104/0208958
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