From flow focusing to vortex formation in crossing microchannels

  • Iulia Rodica Damian
  • Steffen Hardt
  • Corneliu Balan
Research Paper

Abstract

The paper is concerned with the experimental and numerical investigations of the vortex formation and flow focusing inside a cross-shaped microchannel domain. The local hydrodynamics in the junction area, upstream of the focusing region, is analyzed with the aim to characterize the onset and the evolution of the vortical structures, in correlation with the operating parameters. The numerical simulations based on a finite-volume approach are validated by direct flow visualizations using epifluorescence and confocal microscopy. The main result of the study is a flow pattern map, providing comprehensive information on the flow dynamics inside the microchannel junction as a function of the input flow rates and the corresponding Reynolds numbers. The flow pattern map identifies the limits of the flow focusing regime and the critical values of the parameters at which the vortical structures are formed. Beyond the breakdown of the classical flow focusing scenario with one focused output stream, flow patterns with two and four output streams are identified.

Keywords

Microchannel Cross-junction Vortex formation Flow focusing Fluorescence microscopy CFD 

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Hydraulics Department, REOROM LaboratoryPolitehnica University of BucharestBucharestRomania
  2. 2.Institute for Nano- and MicrofluidicsTU DarmstadtDarmstadtGermany

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