Abstract
In this Letter, we present a particle image/tracking velocimetry (PIV/PTV) technique for simultaneous velocity measurement of both fluid and particle phases, adopting newly developed optical phase discrimination methods and novel optical particles. Spherical acrylic (PMMA) particles of diameter $\sim{\rm O}({100}\;\unicode{x00B5}{\rm m})$ were used as the particle phase, while fine ${\rm BAM}:{{\rm Eu}^{2 +}}$ phosphors of diameter $\sim{\rm O}({1}\;\unicode{x00B5}{\rm m})$ were used as the fluid tracer. Under Nd:YAG 355 nm laser excitation, both the laser-induced fluorescence (LIF) from PMMA and laser-induced phosphorescence (LIP) from ${\rm BAM}:{{\rm Eu}^{2 +}}$ provided sufficiently strong signals for PIV imaging with two non-intensified cameras and were clearly separable for phase discrimination using spectral filters and temporal profiles. The advantages of the PIV/PTV method include the relatively low cost of ${\rm BAM}:{{\rm Eu}^{2 +}}$ phosphors, high sphericity and narrow size distribution of PMMA particles with LIF emission, and direct optical discrimination eliminating artifacts, while requiring much less computational capacity for PIV/PTV processing of complex particle-laden flows.
© 2021 Optical Society of America
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