Frame rate free image velocimetry for microfluidic devices

Abstract

Here, we introduce Streamline Image Velocimetry, a method to derive fluid velocity fields in fully developed laminar flow from long-exposure images of streamlines. Streamlines confine streamtubes, in which the volumetric flow is constant for incompressible fluid. Using an explicit analytical solution as a boundary condition, velocity fields and emerging properties such as shear force and pressure can be quantified throughout. Numerical and experimental validations show a high correlation between anticipated and measured results, with R 2 > 0.91. We report spatial resolution of 2 lm in a flow rate of 0.15 m/s, resolution that can only be achieved with 75 kHz frame rate in traditional particle tracking velocimetry. V C 2013 AIP Publishing LLC.

Opposing shear-induced forces dominate inertial focusing in curved channels and high Reynolds numbers

“…Briefly, molds were fabricated by photolithography of SU8 on silicon wafers at the Harvey Krueger Center of Nanoscience and Nanotechnology at the Hebrew University of Jerusalem. Channels were replica molded in PDMS and bonded to glass using oxygen plasma as previously described 32,35,36 . Channels and glass were cleaned using 3M low-residue adhesion tape (St. Paul, MN).…”