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首页> 外文期刊>Chemical Engineering Science >Investigation of mixing/segregation of mixture particles in gas-solid fluidized beds
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Investigation of mixing/segregation of mixture particles in gas-solid fluidized beds

机译：气固流化床中混合颗粒混合/分离的研究

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摘要

A multi-fluid computational fluid dynamics (CFD) model based on kinetic theory of granular flow and Eulerian-Eulerian approach for binary mixture of particles was presented. The multi-fluid model with gas phase and two particle phases of either different particle sizes or densities is used to simulate flows in bubbling gas-solid fluidized beds. The flow behavior of particle mixing or separation in bubbling fluidized beds was numerically predicted. Details of particle collision information were obtained through tracing particle motions based on Eulerian-Lagrangian approach coupled with the discrete hard-sphere model. The distributions of volume fraction, velocity and granular temperature of particles of two different sizes or densities were obtained. The discrete hard-sphere modeling results quantified the granular temperatures, particle fluctuating velocities, particle phase stresses, as well as the particle shear viscosities. The simulations using both the multi-fluid model and the discrete hard-sphere model clearly indicate particle separation phenomenon in the fluidized beds, where relatively larger or heavier particles are observed near the bed bottom than at the bed top region while relatively smaller or lighter particles were found at bed top than at the bed bottom. Better particle mixing can be obtained by increasing the fluidizing velocity. (c) 2006 Elsevier Ltd. All rights reserved.
机译：提出了一种基于颗粒流动动力学理论和欧拉-欧拉方法的二元颗粒混合流体多流体计算流体动力学模型。具有气相和具有不同粒径或密度的两个颗粒相的多流体模型用于模拟鼓泡气固流化床中的流动。数值预测了鼓泡流化床中颗粒混合或分离的流动行为。通过基于欧拉-拉格朗日方法并结合离散硬球模型跟踪粒子运动，获得了粒子碰撞信息的详细信息。得到了两种不同尺寸或密度的颗粒的体积分数，速度和颗粒温度的分布。离散硬球建模结果量化了颗粒温度，颗粒波动速度，颗粒相应力以及颗粒剪切粘度。同时使用多流体模型和离散硬球模型进行的模拟清楚地表明了流化床中的颗粒分离现象，在流化床中观察到床底附近的颗粒比床顶部附近的颗粒更大或更重，而颗粒更小或更轻被发现在床顶而不是床底。通过增加流化速度可以获得更好的颗粒混合。 （c）2006 Elsevier Ltd.保留所有权利。

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