Bubble formation at a central orifice in a gas-solid fluidized bed predicted by three-dimensional two-fluid model calculations
Autor: | Vikrant Vijay Verma, Jam Hans Kuipers, NG Niels Deen, JT Johan Padding |
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Přispěvatelé: | Multi-scale Modelling of Multi-phase Flows, Group Deen |
Jazyk: | angličtina |
Rok vydání: | 2014 |
Předmět: |
Chromatography
Chemistry General Chemical Engineering Bubble General Chemistry Mechanics Two-fluid model Industrial and Manufacturing Engineering Volumetric flow rate Physics::Fluid Dynamics Fluidized bed Environmental Chemistry Liquid bubble Cylindrical coordinate system Body orifice Leakage (electronics) |
Zdroj: | Chemical Engineering Journal, 245, 217-227. Elsevier |
ISSN: | 1385-8947 |
Popis: | We apply a recently developed two-fluid continuum model (TFM) based on kinetic theory of granular flow (KTGF) in three dimensional cylindrical coordinates, to investigate bubble formation through a single central orifice in a gas–solid fluidized bed. A comprehensive study for Geldart D type particles, revealing the influence of particle diameter, jet injection flow rate, and bed size on bubble characteristics have been investigated. At a given gas injection flow rate, the bubble diameter continuously increases while gas leakage from the bubble to the emulsion phase decreases with time. With increasing particle diameter, leakage fraction increases and hence a smaller bubble diameter is predicted. These results are consistent with DPM simulations, experimental results and approximate bubble formation models reported previously in the literature. |
Databáze: | OpenAIRE |
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