MicroPIV and numerical characterization of microfluidic flow: quantitative velocity profiles, channel geometries, and flow rates.
M. J. B. Moura1; P. W. Bryant2; R. F. Neumann2; M. Steiner2; M. S. Carvalho1; C. Feger3
1 PUC-Rio; 2 IBM Research Brazil; 3 IBM Research
doi:10.20906/CPS/COB-2015-2218
Resumo
Microscopic Particle Image Velocimetry (μPIV) is a technique used to obtain velocity fields of fluid flow at the microscale. In practice, this technique is complicated by the fact that one must sample optically over a finite volume, over which significant variations of the velocity fields can occur. For this reason μPIV measurements have only been used to obtain qualitative results, unless the finite volume effects were corrected through the use of convoluted data processing methods. Here we present a new method that combines the analysis of experimental data and numerical simulations for obtaining quantitative velocity profile information. Our method allows one to obtain the size and shape of the effective volume over which moving fluids are sampled. We also show how the method permits one to infer either the channel geometry, the flow rate, or the velocity field for a system where one of these quantities is not known. This method not only provides quantitative results, but also increases the simplicity and utility of μPIV measurements.
Palavras-chave: MicroPIV; Microfluidics; Lattice-Boltzmann; Fluid Dynamics; Particle Image Velocimetry