Measuring turbulence in a circulating fluidized bed using PIV techniques--颗粒学报PARTICUOLOGY

Kashyap, M., Chalermsinsuwan, B., & Gidaspow, D. (2011). Measuring turbulence in a circulating fluidized bed using PIV techniques. Particuology, 9(6), 572–588. https://doi.org/10.1016/j.partic.2011.06.007

Measuring turbulence in a circulating fluidized bed using PIV techniques

Mayank Kashyap ^a *, Benjapon Chalermsinsuwan ^{b c}, Dimitri Gidaspow ^a

a Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA
b Fuel Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Phayathai Road, Patumwan, Bangkok 10330, Thailand
c Center of Excellence for Petroleum, Petrochemicals, and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand

10.1016/j.partic.2011.06.007

Volume 9, Issue 6, December 2011, Pages 572-588

Received 27 June 2010, Revised 23 May 2011, Accepted 2 June 2011, Available online 19 October 2011.

E-mail: kashmay@iit.edu

Highlights

Abstract

This study utilized the particle image velocimetry (PIV) technique, non-invasively near the wall, in the developing region, for the measurements of laminar and turbulent properties during circulation of Geldart B type particles in the U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) riser. A novel method was used to measure axial and radial laminar and turbulent solids dispersion coefficients using autocorrelation technique.

The instantaneous and hydrodynamic velocities for the solid phase were measured simultaneously in the axial and radial directions using a CCD camera, with the help of a colored rotating transparency. The measured properties, such as laminar and Reynolds stresses, laminar and turbulent granular temperatures, laminar and turbulent dispersion coefficients and energy spectra exhibited anisotropy. The mixing in the riser was on the level of clusters. The total granular temperatures were in reasonable agreement with the literature values. However, the axial and radial solids dispersion coefficients measured near the wall were slightly lower than the radially averaged values in the literature.

Graphical abstract

Keywords

Particle image velocimetry (PIV); Dispersion coefficient; Autocorrelation; Turbulence; Anisotropy

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