A Euler-Euler hydrodynamic modelling and simulation of dense particle flow in a small-scale fluidized bed

IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL
Zhao Yan , Xue Liu , Jiatong Liu , Yang Liu , Guohui Li , Lixing Zhou
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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.

Abstract Image

小尺度流化床中密集颗粒流动的欧拉-欧拉流体力学建模与模拟
流化床中致密粒子流的大涡度模拟是更好地理解气体-粒子两相湍流机理的一种先进策略。基于欧拉-欧拉双流体框架,提出了一种新颖的亚网格尺度颗粒应力模型,以考虑气体流动对颗粒动力学的影响。气体和颗粒之间相互作用的各向异性分散通过开发的二阶矩方法建模,四向耦合通过使用基于颗粒流动动力学理论的颗粒颗粒温度来结合颗粒颗粒碰撞。在小型流化床中进行了数值模拟,预测结果与实验数据非常吻合。结果表明,核心-环状流动结构的演变被捕捉到了。表层气体速度的增加有利于气泡流体力学和各向异性颗粒分散的增强。在 4umf 条件下,气泡状颗粒温度是颗粒颗粒温度的 11.2 倍,颗粒轴向速度的平均值和标准偏差分别是 2umf 条件下的约 2.2 倍和 1.5 倍。气泡运动对异质流模式、颗粒动力学和颗粒雷诺应力的重新分布有很大影响。
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来源期刊
Advanced Powder Technology
Advanced Powder Technology 工程技术-工程:化工
CiteScore
9.50
自引率
7.70%
发文量
424
审稿时长
55 days
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.)
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