Microfluidic analog of an opposed-jets device

• Published in: Applied physics letters Vol. 114; no. 22
• Main Authors: Haward, S. J., Hopkins, C. C., Toda-Peters, K., Shen, A. Q.
• Format: Journal Article
• Language: English
• Published: 03.06.2019
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.5097850

A fully three-dimensional (3D) stagnation point microfluidic device is fabricated that, similar to the classical opposed-jet apparatus, can be operated in either a uniaxial or a biaxial extensional flow mode with an easily controllable strain rate. The microchannel is etched inside fused silica and has optical access through all three planes. A detailed characterization of the Newtonian flow field by microparticle image velocimetry confirms the expected nature of the flow and compares well with the prediction of 3D numerical simulations. Flow-induced birefringence of a model polymer solution demonstrates the extension of macromolecules in both modes of operation and the potential use of the device for quantitative rheo-optical studies. This microfluidic opposed jet device could also be used for examining the deformation and dynamics of drops, cells, fibers, and single molecules in well-defined and relevant flow fields.