Electrodiffusion Method of Near-Wall Flow Diagnostics in Microfluidic Systems

0438759 - ÚCHP 2015 RIV GB eng C - Conference Paper (international conference)
Tihon, Jaroslav - Pěnkavová, Věra - Stanovský, Petr - Vejražka, Jiří
Electrodiffusion Method of Near-Wall Flow Diagnostics in Microfluidic Systems.
Proceedings. London: University College London, 2014, s. 1-8. ISBN 9781908549167.
[Micro and Nano Flows Conference /4./. London (GB), 07.09.2014-10.09.2014]
R&D Projects: GA ČR(CZ) GAP101/12/0585
Institutional support: RVO:67985858
Keywords : microchannel flow * electrodiffusion method * wall shear stress
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
www.mnf2014.com

A novel technique for fabrication of plastic microfluidic systems with integrated metal microelectrodes (called technique of sacrificed substrate) enables us to produce microfluidic devices with precisely shaped sensors for wall shear stress measurements. Several micrometer thick gold sensors built-in a plastic substrate exhibit good mechanical resistance and smoothness. Proper functioning of prepared chips with microsensors has been first tested in various calibration experiments (polarization curve, sensor response to polarization set-up, steady flow calibration, temperature dependence of diffusivity). Our first results obtained for separating/reattaching flow behind a backward-facing step and for gas-liquid Taylor flow in microchannels then demonstrate its applicability for the detection of near-wall flow reversal, the delimitation of flow-recirculation zones, and the determination of wall shear stress response to moving bubbles.
Permanent Link: http://hdl.handle.net/11104/0242160