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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical simulation of heat transfer coefficient around different immersed bodies in a fluidized bed containing Geldart B particles
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Numerical simulation of heat transfer coefficient around different immersed bodies in a fluidized bed containing Geldart B particles

机译：含Geldart B颗粒的流化床中不同沉浸体周围传热系数的数值模拟

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Using the Eulerian-Eulerian two-fluid model (TFM) the hydrodynamics and heat transfer around different immersed bodies in a fluidized bed were analyzed. The kinetic theory of granular flow (KTGF) was used to simulate the solid phase. For hydrodynamic simulations, 3D, 2D Cartesian and 2D axisymmetric frameworks were examined and the differences in the results of these simulations were discussed. For the heat transfer analysis, due to the high computational demand of 3D simulations, the analyses were performed using 2D Cartesian and axisymmetric frameworks. For studying the effect of shape on the CFD results, two cases of spherical and cylindrical immersed bodies were simulated. In addition, two methods for calculating the surface-to-bed heat transfer coefficient (HTC) for 2D Cartesian and axisymmetric models were examined. The first (method I) is based on constant heat flux boundary condition, while the second one (method II) is based on the isothermal wall boundary condition. It was found that method I outperforms the second one for both 2D Cartesian and axisymmetric configurations in prediction of average HTC. It was shown that the simulation results were in closed agreement with the corresponding measured data. The findings revealed that the spherical immersed body, which has a better aerodynamic shape, produced higher HTC in bubbling fluidized bed with Geldart B particles. Finally, the impact of Archimedes number (Ar) on the surface-to-bed HTC was studied. (C) 2019 Elsevier Ltd. All rights reserved.
机译：使用欧拉-欧拉二流体模型（TFM），分析了流化床中不同沉浸体周围的流体动力学和传热。颗粒流动动力学理论（KTGF）用于模拟固相。对于流体动力学模拟，检查了3D，2D笛卡尔坐标系和2D轴对称框架，并讨论了这些模拟结果的差异。对于传热分析，由于3D模拟的计算需求很高，因此使用2D笛卡尔和轴对称框架进行了分析。为了研究形状对CFD结果的影响，模拟了两种情况的球形和圆柱形浸入体。此外，还研究了两种用于计算二维笛卡尔模型和轴对称模型的表面床热传递系数（HTC）的方法。第一个（方法I）基于恒定的热通量边界条件，而第二个（方法II）基于等温壁边界条件。发现在平均HTC的预测中，方法I在二维笛卡尔和轴对称构型方面均优于第二种。结果表明，仿真结果与相应的测量数据吻合良好。研究结果表明，具有更好空气动力学形状的球形浸没体在带有Geldart B颗粒的鼓泡流化床中产生了更高的HTC。最后，研究了阿基米德数（Ar）对表面床HTC的影响。 （C）2019 Elsevier Ltd.保留所有权利。

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