Volumetric-correlation PIV to measure particle concentration and velocity of microflows |
| |
Authors: | Chuong Vinh Nguyen Josie Carberry Andreas Fouras |
| |
Institution: | (1) School of Physics and Monash Node of the CRC for Biomedical Imaging Development, Monash University, Melbourne, VIC, 3800, Australia;(2) Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC, 3800, Australia;(3) Division of Biological Engineering, Monash University, Melbourne, VIC, 3800, Australia; |
| |
Abstract: | Volumetric-correlation particle image velocimetry (VPIV) is a new technique that provides a 3-dimensional 2-component velocity
field from a single image plane. This single camera technique is simpler and cheaper to implement than multi-camera systems
and has the capacity to measure time-varying flows. Additionally, this technique has significant advantages over other 3D
PIV velocity measurement techniques, most notably in the capacity to measure highly seeded flows. Highly seeded flows, often
unavoidable in industrial and biological flows, offer considerable advantages due to higher information density and better
overall signal-to-noise ratio allowing for optimal spatial and temporal resolution. Here, we further develop VPIV adding the
capability to measure concentration and increasing the robustness and accuracy of the technique. Particle concentrations are
calculated using volumetric auto-correlations, and subsequently the velocities are calculated using volumetric cross-correlation
corrected for variations in particle concentration. Along with the ability to calculate the particle concentration profile,
our enhanced VPIV produces significant improvement in the accuracy of velocity measurements. Furthermore, this technique has
been demonstrated to be insensitive to out-of-plane flows. The velocity measurement accuracy of the enhanced VPIV exceeds
that of standard micro-PIV measurements, especially in near-wall regions. The 3D velocity and particle-concentration measurement
capability of VPIV are demonstrated using both synthetic and experimental results. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|