Frame rate free image velocimetry for microfluidic devices

Eliezer Keinan, Elishai Ezra, Yaakov Nahmias

Research output: Contribution to journalArticlepeer-review


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 2 μm 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.

Original languageEnglish
Article number063507
Pages (from-to)63507
JournalApplied Physics Letters
Issue number6
StatePublished - 5 Aug 2013


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