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The Transitional Regime of Backward-Facing Step Flows
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SYSNO ASEP 0372521 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title The Transitional Regime of Backward-Facing Step Flows Author(s) Tihon, Jaroslav (UCHP-M) RID, ORCID, SAI
Pěnkavová, Věra (UCHP-M) RID, ORCID, SAI
Havlica, Jaromír (UCHP-M) RID, ORCID, SAI
Šimčík, Miroslav (UCHP-M) RID, SAI, ORCIDSource Title Proceedings, Volume 2. - Liberec : Technical University of Liberec, 2011 / Vít T. ; Dančová P. ; Novotný P. - ISBN 978-80-7372-784-0 Pages s. 1022-1039 Number of pages 18 s. Action Experimental Fluid Mechanics 2011 Event date 22.11.2011-25.11.2011 VEvent location Jičín Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords bakward-facing step ; flow instability ; wall shear stress Subject RIV CI - Industrial Chemistry, Chemical Engineering R&D Projects GAP101/11/0806 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z40720504 - UCHP-M (2005-2011) Annotation The backward-facing step flow is investigated experimentally (electrodiffusion technique) and numerically (CFD software Fluent) at moderate Reynolds numbers achieved in a water channel. The direction sensitive sensors are used to measure the wall shear rate behind the step and detect the near-wall extent of different flow-recirculation regions. 2D numerical simulations provide additional information on the global flow rearrangement caused by the change of operational parameters (channel expansion ratios, inlet flow conditions). At the transitional flow regime, the near-wall flow exhibits an unsteady character with a high sensitivity to external low-frequency perturbations (intrinsic flow instability). The inlet pulsatile forcing is found to affect strongly the overall flow structure behind the step, resulting in the reattachment length reduction and the reverse flow intensification. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2012
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