Flow Investigation in a Microchannel with a Flow Disturbing Rib

0430957 - ÚCHP 2015 RIV GB eng J - Journal Article
Stogiannis, I.A. - Passos, A.D. - Mouza, A.A. - Paras, S.V. - Pěnkavová, Věra - Tihon, Jaroslav
Flow Investigation in a Microchannel with a Flow Disturbing Rib.
Chemical Engineering Science. Roč. 119, NOV 8 (2014), s. 65-76. ISSN 0009-2509. E-ISSN 1873-4405
R&D Projects: GA ČR(CZ) GAP101/12/0585; GA MŠMT 7AMB12GR018
Institutional support: RVO:67985858
Keywords : microchannel * wall shear stress * micro-PIV
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 2.337, year: 2014

The purpose of this work is to study the flow around a flow-disturbing rib in a rectangular microchannel and to investigate the effect of key design parameters (i.e. the rib height and length as well as the Reynolds number) on the size of the reattachment length of the recirculation zones and the wall shear stress profiles in the vicinity of the rib. Initially the wall shear rate along the channel as well as the velocity field were experimentally determined using the electrodiffusion technique and the μ-PIV method, respectively. The experimental results are then used for validating a CFD code. Finally, the CFD code was employed for investigating the effect of the design parameters on the flow characteristics by performing a parametric study based on the Design of Experiments (DOE) and the Response Surface Methodology (RSM). It was found that the recirculation length in the laminar regime is affected mainly by the Re value and the rib height, whereas in the turbulent regime it is affected strongly by the rib height and slightly also by the rib length. Based on our results two new correlations, which can predict the length of the bottom recirculation zone with reasonable accuracy, are proposed and can be used for the design of microdevices.
Permanent Link: http://hdl.handle.net/11104/0238050