An index to characterize gas-solid and solid-solid mixing from average volume fraction fields

Date
2022-02-09
Authors
Nagawkar, Barlev R.
Kotrike, Venkata P.
Passalacqua, Alberto
Subramaniam, Shankar
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Wiley
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Mechanical Engineering
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Mechanical EngineeringChemical and Biological Engineering
Abstract
A mixing index based on solid volume fraction fields is developed for gas-solid flows. Conventional mixing indices are based on particle realizations of granular mixing and are applicable to experimental data or DEM simulations. However, these indices cannot be used as-is for multi-fluid models, and an index for characterizing mixing in gas-solid flows from continuous fields is needed. The performance of the mixing index is tested in two applications. The first is a 3D simulation of the mixing of biomass and sand in a fluidized bed reactor, and the second is a 2D simulation of binary particle segregation in a fluidized bed. The simulations are performed using OpenFOAM®. The mixing index is used to quantify gas-solid mixing using solid volume fractions and solid-solid mixing using solid fractions. The formulation of conventional mixing indices is extended to be used with solid volume fractions fields, and methods for performance improvement are presented.
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This is the peer-reviewed version of the following article: Nagawkar, Barlev R., Venkata P. Kotrike, Alberto Passalacqua, and Shankar Subramaniam. "An index to characterize gas‐solid and solid‐solid mixing from average volume fraction fields." AIChE Journal (2022): e17639., which has been published in final form at DOI: 10.1002/aic.17639. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Copyright 2022 American Institute of Chemical Engineers. Posted with permission.
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Mixing index, gas-solid mixing, Eulerian model, computational fluid dynamics, fluidized bed
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