Analysis of Flow Field for Rotating Packed Bed Based on the Discrete Phase Model
Analysis of Flow Field for Rotating Packed Bed Based on the Discrete Phase Model
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发表时间：
2012
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通讯作者：
Chen Jianfeng
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作者：
Chen Jianfeng
利用计算流体力学(CFD)软件FLUENT对旋转填充床(RPB)反应器内的流体动力学进行了初步模拟。气相湍流采用RNG k-e湍流模型，液体流动采用多相流的拉格朗日离散相模型(DPM)。建立了旋转填充床内液体颗粒的简化二维模型，研究了旋转填充床内液体颗粒的径向和切向速度分布以及转速对液体颗粒速度的影响。结果表明，液体颗粒速度随转速的升高而增大；研究了转速和进气速度对干床压降的影响，发现随着转速的升高，压降略有增加，填充区内缘存在较强的端部效应，模拟结果表明端部影响区的湍流强度明显高于其他区域。
The computational fluid dynamics(CFD) software Fluent was used to simulate preliminarily the fluid dynamics in the rotating packed bed(RPB) reactors.The turbulent flow of gas phase was modeled by the RNG k-e turbulent model,while the liquid flow was modeled by the Lagrange Discrete Phase Model(DPM) of multiphase flow.A simplified two-dimensional model for RPB was established to study the distribution of radial and tangential velocity of the liquid particles in RPB and the effects of rotating speed on the liquid particle velocity.Results indicate that the liquid particles velocity increases with rising rotating speed;however,rotating speed has little effect on the droplet radial velocity.The effects of rotating speed and gas inlet velocity on the pressure drop in dry bed were also investigated.It was found that the pressure drop increases slightly with rising rotating speed.In addition,it shows that a strong end effect exists at the inner edge of the packed zone,and the simulating results demonstrate that the turbulent intensity in the end effect region is significantly higher than that in other regions.