Powder Technology, Vol.359, 323-330, 2020
Comparison of velocimetry methods for horizontal air jets in a semicircular fluidized bed of Geldart Group D particles
Image-based velocimetry methods have become a widely used method to characterize solids velocity fields in particulate devices; two of the most commonly used methods being particle image velocimetry (PIV) and particle tracking velocimetry (PIV). Often, PIV and PTV are used at different scales or resolutions. Here, both velocimetry methods are applied to same high-speed video dataset The quantity of interest is the measurement of jet penetration depths of four opposing, horizontal high-speed air jets into a semi-circular particulate bed maintained near minimum fluidization. In addition, a novel method, optical flow velocimetry (OFV), is applied for the first time to particulate flows and compared to the well-known PIV and PTV methods. Results show favorable agreement: within 20% over 120 different measurements. Generally, the PTV measurements fall between PR and OFV. The grid-resolution used to resolve the velocity field was also studied, finding the PTV and OFV methods relatively insensitive. (C) 2019 Elsevier B.V. All rights reserved.