CFD-DEM simulation of the flow and mixing behaviors in downer with different entrance structures

赵永志 程易 丁宇龙 金涌

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CFD-DEM simulation of the flow and mixing behaviors in downer with different entrance structures

更新时间：2025-12-10

- CFD-DEM simulation of the flow and mixing behaviors in downer with different entrance structures
- CIESC Journal Issue 6, (2007)
- 作者机构：
  
  清华大学化工系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：05 June 2007，
  
  Published：05 June 2007
- 稿件说明：
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赵永志程易丁宇龙金涌. CFD-DEM simulation of the flow and mixing behaviors in downer with different entrance structures[J]. CIESC Journal, 2007, (6).
DOI：

赵永志程易丁宇龙金涌. CFD-DEM simulation of the flow and mixing behaviors in downer with different entrance structures[J]. CIESC Journal, 2007, (6). DOI：

摘要

采用计算流体力学和离散单元模型（CFD-DEM）耦合一种简单的气固催化反应模型对具有不同入口结构的二维下行床内的气粒流动和混合行为进行全床数值模拟。模拟得到了不同入口结构下行床内的多尺度气固运动状态、全床的固含、速度及反应生成物浓度分布，以及气体和颗粒在下行床内的停留时间分布，发现入口结构对反应器内的流动、混合和气固接触效率起着关键性的作用，入口气体和颗粒的不均匀分布将导致下行床内气体停留时间的宽分布以及气固接触效果的恶劣。

Abstract

The gas-solid flow and mixing behavior in two dimensional downers with different entrance structures were simulated by using a CFD-DEM method.A gas-solid catalytic reaction model was incorporated in the governing equations to investigate the contact efficiency between phases.The simulations showed the dynamic and time-averaged flow structures characterized by the distributions of solids fraction

particle velocity and the reaction product in the whole downer as well as the residence time distributions (RTDs) of gas and solids

which were all heavily influenced by the design of the entrance structure.Non-ideal initial contact between gas and solids would cause wide RTDs of gas and worsen the reactor performance.

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