A Comparative Study of Models for Heat Transfer in Bidisperse Gas-Solid Systems via CFD-DEM Simulations
A Comparative Study of Models for Heat Transfer in Bidisperse Gas-Solid Systems via CFD-DEM Simulations
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DOI：
10.3390/axioms11040179
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发表时间：
2022-04
期刊：
影响因子：
2
通讯作者：
Zheqing Huang;Qi Huang;Yaxiong Yu;Yu Li;Qiang Zhou
中科院分区：
文献类型：
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作者：
Zheqing Huang;Qi Huang;Yaxiong Yu;Yu Li;Qiang Zhou
本文采用计算流体力学-离散元法（CFD-DEM）对双分散气固两相流的流动和传热进行了数值模拟。在模拟中比较了三种不同的模型，以关闭每个物种的双分散系统的气固传热系数。系统地研究了大小颗粒的粒径比和颗粒数比对颗粒平均温度和各组分温度分布的影响。模拟结果表明，在较高的颗粒数比下，三种传热模型的颗粒平均温度和温度分布存在差异。当小颗粒与大颗粒的颗粒数比为1时，三种传热模型对粒径比为4的双分散体系传热性能的影响差异很小。
In this study, flow and heat transfers in bidisperse gas–solid systems were numerically investigated using the computational fluid dynamics–discrete element method (CFD–DEM). Three different models to close the gas–solid heat transfer coefficient for each species of bidisperse systems were compared in the simulations. The effect of the particle diameter ratio and particle number ratio between large and small particles on the particle mean temperature and temperature distribution of each species were systematically investigated. The simulation results show that differences in the particle mean temperature and temperature distribution profiles exist among the three heat transfer models at a higher particle number ratio. The differences between the effects of three heat transfer models on heat transfer properties in bidisperse systems with particle diameter ratios of up to 4 are marginal when the particle number ratio between small and large particles is 1.