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 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.
- Publication:
-
Applied Physics Letters
- Pub Date:
- August 2013
- DOI:
- 10.1063/1.4818142
- Bibcode:
- 2013ApPhL.103f3507K
- Keywords:
-
- laminar flow;
- microfluidics;
- velocimeters;
- 47.61.-k;
- 47.80.Cb;
- 47.85.Np;
- 85.85.+j;
- 06.30.Gv;
- 47.15.-x;
- Micro- and nano- scale flow phenomena;
- Velocity measurements;
- Fluidics;
- Micro- and nano-electromechanical systems and devices;
- Velocity acceleration and rotation;
- Laminar flows