ORCID Profile
0000-0001-7899-9676
Current Organisation
University of Adelaide
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Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 08-2022
Publisher: Optica Publishing Group
Date: 05-08-2021
DOI: 10.1364/OL.428357
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 ∼ O ( 100 µ m ) were used as the particle phase, while fine B A M : E u 2 + phosphors of diameter ∼ O ( 1 µ 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 B A M : E u 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 B A M : E u 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.
Publisher: Elsevier BV
Date: 2022
Publisher: Open Book Publishers
Date: 08-2019
DOI: 10.11647/OBP.0169.01
Publisher: Elsevier BV
Date: 06-2019
Publisher: Optica Publishing Group
Date: 23-03-2021
DOI: 10.1364/OE.421017
Abstract: We report an optical method for particle velocity measurement that is suitable for the measurement of particle velocities within dense particle-laden flows with high spatial resolution. The technique is based on particle shadow velocimetry with the use of a long-distance microscopic lens for images collection. The narrow depth of field of the lens allows particles within the focal plane to have much higher pattern intensities than those outside it on the collected images. Data processing was then employed to remove particles from outside the focal plane based on the gradient of the signal and a threshold. Following this, particle velocity was calculated from two successive images in the usual way. The technique was successfully demonstrated in a free-falling particle curtain with volume fractions in the four-way coupling regime of near-spherical micro-particles falling under gravity. The method was successfully employed to measure the transverse velocity profile through the curtain, which is the first time that such a measurement has been performed. Other highly-fidelity experimental data, which is also well suited to model development and validation, include the particle mass flow rate, curtain thickness and opacity.
Publisher: Elsevier BV
Date: 09-2022
Publisher: Springer Science and Business Media LLC
Date: 19-03-2020
Publisher: Springer Science and Business Media LLC
Date: 31-03-2021
No related grants have been discovered for Zhiwei Sun.