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ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
EFFECT OF THE FLOW MACRO-SCALE ON THE EFFECTIVE STRESSES IN DENSE GAS-SOLID FLUIDIZED FLOWS
Submission Author:
Joseph Mouallem , SP , Brazil
Co-Authors:
Joseph Mouallem, Seyed Reza Amini Niaki, Christian Milioli, Fernando Milioli
Presenter: Joseph Mouallem
doi://10.26678/ABCM.ENCIT2018.CIT18-0035
Abstract
Results of highly resolved simulations, filtered in space and time, are used to generate sub-grid closure models for large scale simulations of gas-solid fluidized flows. Actual closures provide a good qualitative description of gas-solid flows but their quantitative accuracy remains an issue. Enhancements over the sub-grid filtered parameters are required. Among these parameters are the effective stresses. Recent studies showed that macro-scale parameters such as gas flow Reynolds number and domain average solid volume fraction present a considerable effect over the filtered parameters in dilute gas solid flows. Thus, macro-scale parameters should be accounted for in sub-grid closure models. This study extends the previous findings and analysis (Mouallem et al., "Effect of the flow macro-scale on the effective stresses in gas- solid riser flows", COBEM2017). It has been shown that the effect of macro-scale parameters diminishes when shifting from dilute to dense flows.
Keywords
gas-particle flow, Fluidization, Two Fluid Model, Sub-grid modeling, effective stresses
