The focus in the paper is on an evaluation of the friction factors as a function of the modified Reynolds number for the pressure drop through randomly and structured packed beds consisting only of uniform sized spheres. In the evaluation of the friction factor for large aspect ratio randomly packed beds it is confirmed that the use of the Ergun correlation should be avoided and that the KTA correlation should be employed to predict the friction factor. The effect of the wall for small aspect ratio randomly packed beds as predicted by the Eisfeld and Schnitzlein correlation is also evaluated and it is suggested that the use of the correlation be restricted to aspects ratios of $D/d_p>2$. The combination between the Eisfeld and Schnitzlein and KTA correlations should also be investigated. An evaluation is also provided for the friction factor results for selected structured packed beds. A correlation is proposed to predict the friction factor for offset simple cubic, hexagonal close packed, simple cubic and body-centred cubic packed beds. It is recommended that the friction factors for structured packed beds should be studied in more detail to develop a sound understanding of the effect of the packing structure on the pressure drop through a packed bed.

本文的重点是评估通过随机和仅由大小均一的球组成的结构化填充床的压降所产生的摩擦因数与修正雷诺数的函数关系。在评估大长径比随机填充床的摩擦系数时，已确认应避免使用Ergun相关性，并且应使用KTA相关性来预测摩擦因数。还评估了Eisfeld和Schnitzlein相关性所预测的小长宽比随机填充床的墙的影响，并建议将相关性的使用限制为$d/d_p>\mathrm{2个}$。Eisfeld和Schnitzlein之间的组合以及KTA相关性也应进行研究。还为所选结构化填充床的摩擦系数结果提供了评估。提出了一种相关性来预测偏心的简单立方，六边形密堆积，简单立方和以人体为中心的立方堆积床的摩擦系数。建议对结构性填充床的摩擦系数进行更详细的研究，以更好地理解填充结构对通过填充床的压降的影响。