{"title":"A Euler-Euler hydrodynamic modelling and simulation of dense particle flow in a small-scale fluidized bed","authors":"","doi":"10.1016/j.apt.2024.104691","DOIUrl":null,"url":null,"abstract":"<div><div>Large eddy simulation of dense particle flow in fluidized bed is an advanced strategy to acquire a better understanding mechanism of gas-particle two-phase turbulent flow. A novelty particle stress model at subgrid scale level based on the Euler-Euler two-fluid frame is proposed to consider the effect of gas flow on particle dynamics. Anisotropic dispersion of interactions between gas and particle is modeled by a developed second-order moment approach, the four-way coupling is used to combine the particle–particle collisions by using the particle granular temperature based on the kinetic theory of granular flow. Numerical simulation is carried out in a small-scale fluidized bed and predictions are well agreed with the experimental data. Results show that the evolution of core-annular flow structure is captured. Increased superficial gas velocity is favorable for the enhancement of bubble hydrodynamics and anisotropic particle dispersions. At the 4u<sub>mf</sub>, Bubblelike granular temperature is 11.2 times larger than particle granular temperature, and mean and standard deviation values of axial particle velocity are approximately 2.2 times and 1.5 times larger than those of 2u<sub>mf</sub>. Bubble motions have a great effect on the heterogeneous flow pattern, particle dynamics and the redistribution of particle Reynolds stresses.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.2000,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Powder Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921883124003674","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Large eddy simulation of dense particle flow in fluidized bed is an advanced strategy to acquire a better understanding mechanism of gas-particle two-phase turbulent flow. A novelty particle stress model at subgrid scale level based on the Euler-Euler two-fluid frame is proposed to consider the effect of gas flow on particle dynamics. Anisotropic dispersion of interactions between gas and particle is modeled by a developed second-order moment approach, the four-way coupling is used to combine the particle–particle collisions by using the particle granular temperature based on the kinetic theory of granular flow. Numerical simulation is carried out in a small-scale fluidized bed and predictions are well agreed with the experimental data. Results show that the evolution of core-annular flow structure is captured. Increased superficial gas velocity is favorable for the enhancement of bubble hydrodynamics and anisotropic particle dispersions. At the 4umf, Bubblelike granular temperature is 11.2 times larger than particle granular temperature, and mean and standard deviation values of axial particle velocity are approximately 2.2 times and 1.5 times larger than those of 2umf. Bubble motions have a great effect on the heterogeneous flow pattern, particle dynamics and the redistribution of particle Reynolds stresses.
期刊介绍:
The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide.
The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them.
Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)