Effect of Bed Thickness on the Segregation Behavior of Particle Mixtures in a Gas Fluidized Bed
Effect of Bed Thickness on the Segregation Behavior of Particle Mixtures in a Gas Fluidized Bed
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DOI：
10.1021/ie901478a
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发表时间：
2010-02
影响因子：
4.2
通讯作者：
Yuqing Feng;A. Yu
中科院分区：
文献类型：
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作者：
Yuqing Feng;A. Yu
离散颗粒模拟已被认为是一种有用的数值技术来阐明颗粒-流体流动的基本原理，特别是气体流化。通常是将固体流动的离散元法（DEM）与连续气体的计算流体力学（CFD）相结合来实现的。由于计算能力的限制，这类研究主要采用将颗粒视为圆盘的二维床层或厚度与颗粒直径相同的伪三维床层进行。一维运动的丧失会对流动及其相关行为产生重大影响。本文用数值方法研究了流化床前后壁面对颗粒混合物混合和偏析行为的影响。用于模拟的颗粒直径分别为漂浮物1毫米和喷射物2毫米。对两层不同厚度、不同气速流化的流化床进行了数值模拟。一个……
Discrete particle simulation has been recognized as a useful numerical technique to elucidate the fundamentals of particle−fluid flow, in particular, gas fluidization. In general, it is achieved by combining discrete element method (DEM) for solid flow with computational fluid dynamics (CFD) for continuum gas. Limited by computational capability, such studies are mainly conducted using a two-dimensional (2D) bed in which particles are treated as discs or a pseudo-three-dimensional (3D) bed where the bed thickness is the same as the particle diameter. The loss of one-dimensional motion may significantly affect the flow and related behavior. This paper presents a numerical study of the effect of the front and rear walls of a fluidized bed on the mixing and segregation behavior of particle mixtures. Particle diameters used for simulation are 1 mm for flotsam and 2 mm for jetsam, respectively. Numerical simulations are conducted for two beds of different thicknesses, fluidized at different gas velocities. One...