Heat transfer in indirect heated rotary drums filled with monodisperse spheres: Comparison of experiments with DEM simulations
Heat transfer in indirect heated rotary drums filled with monodisperse spheres: Comparison of experiments with DEM simulations
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DOI：
10.1016/j.powtec.2015.07.022
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发表时间：
2015-12
影响因子：
5.2
通讯作者：
H. Komossa;S. Wirtz;V. Scherer;F. Herz;E. Specht
中科院分区：
文献类型：
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作者：
H. Komossa;S. Wirtz;V. Scherer;F. Herz;E. Specht
采用离散元法 (DEM) 进行数值模拟并进行相应的实验研究，以了解和量化间接加热转鼓中的传热。使用单分散玻璃球（直径 2 毫米），整体运动保持在滚动运动模式（转速在 1 至 9 rpm 之间）。重点是覆盖壁和与该壁接触的颗粒之间以及自由床表面上的颗粒和相邻流体之间的热传递。由于系统内最高温度较低 (474 K)，辐射传热被忽略。上述热通量的有效传热系数是从 DEM 模拟中得出的，考虑了自由床表面和壁上的实际颗粒速度。模拟产生的颗粒运动和传热结果与实验总体吻合良好，因此可以计算当前研究中考虑的参数范围的有效传热系数。
Numerical simulations with the discrete element method (DEM) and corresponding experimental investigations were carried out to understand and to quantify the heat transfer in indirect heated rotating drums. Monodisperse glass spheres (diameter 2 mm) were used and the bulk movement was kept within the rolling motion mode (rotational speed between 1 and 9 rpm). The focus is on the heat transfer between the covered wall and the particles in contact with this wall, as well as between the particles on the free bed surface and the adjacent fluid. Radiative heat transfer has been neglected due to the low maximum temperature within the system (474 K). Effective heat transfer coefficients for the heat fluxes mentioned were derived from the DEM simulations, considering the actual particle velocities on the free bed surface and on the wall.The particle movement and the heat transfer resulting from the simulations show good agreement with the experiments in general and thus allow the calculation of the effective heat transfer coefficients for the range of parameters considered in the current study.