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首页> 外文期刊>Journal of Heat Transfer >Characterizing Effects of the Shape of Screw Conveyors in Gas-Solid Fluidized Beds Using Advanced Numerical Models
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Characterizing Effects of the Shape of Screw Conveyors in Gas-Solid Fluidized Beds Using Advanced Numerical Models

机译：使用高级数值模型表征气固流化床中螺旋输送机形状的效果

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摘要

A numerical study of the effects of the shape of an enclosed screw conveyor on the mixing and heat transfer in a horizontal gas-solid fluidized bed was conducted using computational fluid dynamics (CFD). A two-fluid model (TFM) was employed to model the gas and solid phases as continua through mass, momentum, and energy conservations. The motion of the screw conveyor was simulated by using a rotating reference frame (RRF) such that the computational mesh was free from dynamic reconstruction. The diameters of the screw flight and shaft, the pitch, and the blade thickness were varied in the parametric study. Under the operating conditions studied, it was found that the increase in the diameter of the screw flight results in the enhancement of the solid mixing and conveyance. The increase in the diameters of the screw shaft and the screw blade thickness lead to the enhanced solid mixing but reduced conveyance. The variation in the screw pitch gives rise to rather complex behaviors in the solid mixing and conveyance. As the screw pitch is decreased, the solid mixing increases initially but then decreases before it increases eventually. The solid conveyance capability was found to first increase and then decrease. Explanations to the effects of the shape of the screw conveyor were discussed in this work.
机译：利用计算流体动力学（CFD）对封闭式螺旋输送机的形状对水平气固流化床中混合和传热的影响进行了数值研究。采用双流体模型（TFM）通过质量，动量和能量守恒对气相和固相进行连续建模。通过使用旋转参考框架（RRF）模拟螺旋输送机的运动，从而使计算网格不受动态重建的影响。在参数研究中，螺杆螺纹和轴的直径，螺距和叶片厚度均发生了变化。在所研究的操作条件下，发现螺杆螺纹直径的增加导致固体混合和输送的增强。螺杆轴的直径和螺杆叶片厚度的增加导致固体混合的增强，但输送减少。螺杆螺距的变化在固体混合和输送中引起相当复杂的行为。随着螺杆螺距的减小，固相混合量最初会增加，但随后会减少，直到最终增加。发现固体输送能力首先增加然后降低。在这项工作中讨论了对螺旋输送机形状影响的解释。

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