Modelling heat transfer during flow through a random packed bed of spheres
Modelling heat transfer during flow through a random packed bed of spheres
复制标题
DOI：
10.1007/s00231-017-2192-3
复制
发表时间：
2018-04
影响因子：
2.2
通讯作者：
Per E. C. Burström;V. Frishfelds;A. Ljung;T. Lundström;B. D. Marjavaara
中科院分区：
文献类型：
--
作者：
Per E. C. Burström;V. Frishfelds;A. Ljung;T. Lundström;B. D. Marjavaara
采用离散三维球体系统和连续计算流体动力学（CFD）模型对单一尺寸铁矿石球团随机填充床中的传热进行了模拟。结果表明，两个模型之间的平均值在床的横截面上的入口处的均匀的温度分布的良好协议。离散模型的优点是它可以捕捉局部效应，例如低速段的传热减少。缺点是，对于较大的颗粒系统，计算量很大。如果平均值足够，CFD模型是一个有吸引力的替代方案，它很容易耦合到填充床的上游和下游的物理。此外，离散模型和连续模型之间的良好一致性表明，离散模型也可以用于层流和湍流之间的过渡区域中的非Stokian流，因为湍流效应对连续模型中的总传热速率几乎没有影响。
Heat transfer in a random packed bed of monosized iron ore pellets is modelled with both a discrete three-dimensional system of spheres and a continuous Computational Fluid Dynamics (CFD) model. Results show a good agreement between the two models for average values over a cross section of the bed for an even temperature profiles at the inlet. The advantage with the discrete model is that it captures local effects such as decreased heat transfer in sections with low speed. The disadvantage is that it is computationally heavy for larger systems of pellets. If averaged values are sufficient, the CFD model is an attractive alternative that is easy to couple to the physics up- and downstream the packed bed. The good agreement between the discrete and continuous model furthermore indicates that the discrete model may be used also on non-Stokian flow in the transitional region between laminar and turbulent flow, as turbulent effects show little influence of the overall heat transfer rates in the continuous model.