Coupled DEM/CFD simulation of heat transfer in a generic grate system agitated by bars
Coupled DEM/CFD simulation of heat transfer in a generic grate system agitated by bars
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DOI：
10.1016/j.powtec.2013.08.043
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发表时间：
2013-11
影响因子：
5.2
通讯作者：
S. Rickelt;F. Sudbrock;S. Wirtz;V. Scherer
中科院分区：
文献类型：
--
作者：
S. Rickelt;F. Sudbrock;S. Wirtz;V. Scherer
将耦合的DEM/CFD模拟与在普通格栅上搅拌的球形颗粒(直径10 mm)的实验进行了比较，并暴露在热空气流动的瞬时升温中。一台摄像机和一个热像仪系统监控着实验。由于颗粒呈现Biot数，在DEM模拟中，通过求解一维非定常导热微分方程，计算了颗粒内部的径向温度分布。对床层内颗粒的升温和颗粒输运的直观比较表明，模拟和实验之间有很好的一致性。此外，还计算了颗粒床层不同层的局部最低、最高和平均颗粒表面温度。实验测得的颗粒床层高度上的温度梯度与DEM/CFD模拟结果吻合很好。
Coupled DEM/CFD simulations are compared to experiments with agitated spherical particles (10 mm in diameter) on a generic grate and exposed to a transient heat-up by a hot air flow. A video camera and a thermographic system monitor the experiments. Because the particles show Biot numbers > 1 the radial temperature distribution within the particle has been calculated by solving the unsteady one-dimensional differential equation for heat conduction in the DEM simulations. A visual comparison of the heat-up of the particles and particle transport within the bed shows a good agreement between simulations and experiments. In addition, local minimum, maximum and average particle surface temperatures in different layers of the particle bed are calculated. Experimentally measured temperature gradients over the particle bed height are in very good agreement to DEM/CFD simulations.