Effect of particle Froude number on sub-grid effective drag, filtered and residual stresses in fluidized gas-particle flows

IF 4.1 2区材料科学 Q2 ENGINEERING, CHEMICAL

Particuology Pub Date : 2024-09-14 DOI:10.1016/j.partic.2024.09.002

Christian C. Milioli, Fernando E. Milioli

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Abstract

Sub-grid effective drag, filtered and residual stresses in the meso-scale of gas-particle fluidized flows are intrinsically affected by underlying micro-scale conditions as well as non-local effects related to macro-scale conditions. In this work we applied microscopic two-fluid modeling to experiment with particle Froude number in order to evaluate the impact of this micro-scale condition over the concerning meso-scale derived sub-grid parameters. We performed highly resolved simulations in periodic domains for particle Froude numbers from 12.21 to 799.22, for a wide range of macro-scale conditions. Results were filtered and classified by ranges of meso-scale markers for the various particle Froude numbers. The particle Froude number was found to considerably affect the structural refinement of the heterogeneous flow fields thereby directly impacting effective drag, filtered and residual stresses. All of those parameters showed systematic behaviors in relation to particle Froude number, thereby providing sound data for new sub-grid modeling propositions.

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粒子弗劳德数对流态化气体-粒子流中子网格有效阻力、过滤和残余应力的影响

气体颗粒流体化流动中观尺度下的子网格有效阻力、过滤和残余应力本质上受到微观尺度条件以及与宏观尺度条件相关的非局部效应的影响。在这项工作中，我们将微观双流体建模应用于粒子 Froude 数实验，以评估这种微观尺度条件对有关中观尺度衍生子网格参数的影响。我们在周期域中对 12.21 到 799.22 之间的粒子 Froude 数进行了高分辨率模拟，适用于各种宏观尺度条件。我们对结果进行了过滤，并根据各种粒子费尔德数的中尺度标记范围进行了分类。研究发现，颗粒弗劳德数对异质流场的结构细化有很大影响，从而直接影响有效阻力、滤波和残余应力。所有这些参数都显示出与颗粒弗劳德数相关的系统行为，从而为新的子网格建模命题提供了可靠的数据。

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.