Borescopic particle image velocimetry in bubbling gas–solid fluidized beds--颗粒学报PARTICUOLOGY

Banaei, M., Dellaert, R., Deen, N. G., Kuipers, J. A. M., & van Sint Annaland, M. (2019). Borescopic particle image velocimetry in bubbling gas–solid fluidized beds. Particuology, 43, 66-75. https://doi.org/10.1016/j.partic.2018.01.012

Borescopic particle image velocimetry in bubbling gas–solid fluidized beds

M. Banaei ^{a b *}, R. Dellaert ^a, N.G. Deen ^{b c}, J.A.M. Kuipers ^{a b}, M. van Sint Annaland ^{a b}

a Multiphase Reactors Group, Department of Chemical Engineering & Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
b Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands
c Multiphase and Reactive Flows Group, Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

10.1016/j.partic.2018.01.012

Volume 43, April 2019, Pages 66-75

Received 7 August 2017, Revised 4 December 2017, Accepted 19 January 2018, Available online 28 June 2018, Version of Record 19 February 2019.

E-mail: mohammad.banaei@outlook.com

Highlights

• Sensitivity and accuracy analyses on the BPIV technique were performed.

• Fair agreement between BPIV results and PEPT data was observed in a bubbling fluidized bed.

• Discrepancies of BPIV and PEPT results were mainly due to their intrinsic difference.

• Accounting for solid volume fraction may improve the BPIV accuracy.

Abstract

In this work, the borescopic particle image velocimetry (BPIV) technique was applied to a bubbling gas–solid fluidized bed, and the results were compared with published positron emission particle tracking (PEPT) measurement data. Before performing the experiments, the sensitivity of the BPIV results to the illumination power, light reflectivity of the particles, and location of the borescope was also investigated. The BPIV and PEPT results were in fair agreement; however, some discrepancies were observed. The difference between the two sets of results were mainly caused by the intrusiveness of BPIV, the fact that the local solids volume fraction was not accounted for in the BPIV analysis, and the intrinsic differences of these two methods. Therefore, measurement of the local solids volume fraction with the borescope is highly recommended for further development of the BPIV method, which will also enable measurement of the local solids mass fluxes inside dense gas–solid fluidized beds.

Graphical abstract

Keywords

Borescopic particle image velocimetry; Gas–solid bubbling fluidized bed; Solid velocity profile; Experimental investigation; Hydrodynamics

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