EXTENDING THE COMPARISON OF VOIDAGE MEASUREMENT AND MODELING TECHNIQUES IN FLUIDIZED BEDS

摘要

Accurate measurement and simulation of particle velocity and voidage are important for predicting such properties as heat and mass transfer, reaction conversion, and elutriation in fluidized bed reactors.Published literature has focused on different measurement techniques and continuous improvement of modeling approaches.Dubrawski et al.(2013) compared several invasive and non-invasive measurement techniques for voidage measurement, in particular optical probes, electrical capacitance tomography (ECT), X-ray computed tomography (XCT) and radioactive particle tracking (RPT).This paper evaluates another invasive measurement technique, borescopic high-speed particle image velocimetry (PIV), and compares it with the voidage data of Dubrawski et al.(2013) and with CFD predictions using Euler-Euler and Euler-Lagrangian approaches.Important issues with numerical modeling of hydrodynamics in a fluidized bed containing Geldart Group A particles are also revisited.