In recent years, computational fluid dynamic (CFD) simulation of fully resolved fixed beds has become a popular tool for getting deeper insight in local phenomena in packed beds. To get correct simulation results, special care has to be taken on how to treat particle/particle and particle/wall contact points.

In this work a local contact point modification, the local bridges method is investigated to study its effect on the heat transfer in packed beds. Packings were created using the Discrete Element Method (DEM) software discrete Flow, and were modified to implement the bridges. Using Design of Simulation Experiments (DoSE) the influence of different parameters on the heat transfer was studied. The simulated heat transfer in packed beds, considering conduction as well as natural convection, is compared to measurements and well-established correlations. Based on the Design of Simulation Experiments, a model for the correction of the effective thermal conductivity of bridges, to reduce the simulation error as a function of particle diameter D, is suggested. The suggested correction was tested on spheres of different material and sizes to check its validity. Using this correction, the simulation error for the beds surface temperature could be reduced by 75 % in a representative example case.

近年来，完全解析固定床的计算流体动力学（CFD）模拟已成为一种流行的工具，可用于深入了解填充床中的局部现象。为了获得正确的模拟结果，必须特别注意如何处理粒子/粒子和粒子/壁接触点。

在这项工作中，对局部接触点进行了修改，研究了局部桥接方法，以研究其对填充床传热的影响。使用离散元素方法（DEM）软件离散流创建包装，并对其进行修改以实现桥梁。使用模拟实验设计（DoSE），研究了不同参数对传热的影响。考虑到传导性和自然对流，将填充床中的模拟传热与测量结果和相关性进行了比较。根据模拟实验的设计，提出了一种用于校正桥梁有效导热系数的模型，以减小作为粒径D的函数的模拟误差。建议的校正已在不同材质和尺寸的球体上进行了测试，以检查其有效性。使用该校正，在代表性示例情况下，床表面温度的模拟误差可以减少75％。