title: 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 R2> 0.91. We report spatial resolution of 2μm 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.
authors.affiliation: Center for Bioengineering, The Rachel and Selim Benin School of Computer Science and Engineering, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
authors.forename: Eliezer
authors.initials: E
authors.lastname: Keinan
authors.forename: Elishai
authors.initials: E
authors.lastname: Ezra
authors.forename: Yaakov
authors.initials: Y
authors.lastname: Nahmias
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