Analysis of Horizontal Solids Convection and Dispersion in Fluidized Beds
Fluidization
2023
Fluidization XVII
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Fundamentals Session 4: Transport Phenomena
Tuesday, May 23, 2023 - 6:15pm to 6:30pm
Lateral solid dispersion induced by the bubble flow is quantified and compared with a net horizontal solids convection forced onto the bed, along with the interaction between dispersion and convective processes. The experiments are conducted in a set-up designed to force a horizontal flow of bubbling fluidized solids around a closed horizontal loop. The loop contains a horizontal straight channel through which the concentration of a ferromagnetic solids tracer injected upstream is measured non-intrusively (at 100 Hz) by means of an impedance coil at four different positions along the channel. The set-up is designed in accordance with Glicksman's complete set of fluid-dynamic scaling laws, allowing measurement scale-up to large-scale hot conditions. The measured values are used to fit a mathematical model of a one-dimensional transient convection-dispersion process, thereby obtaining the lateral solids dispersion coefficient. Three operational parameters were examined: bed height, fluidization velocity, and lateral solids convection.
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