Packed beds are widely used in industries, in which the flow and heat transfer characteristics of the packed bed may have a significant effect on the energy efficiency of the whole system. The flow and heat transfer characteristics of packed beds are greatly dependent on their structures. Therefore, it is crucial to develop new packing structures to improve the overall heat transfer performance of packed beds. In the present paper, a grille-sphere composite structured packed bed (GSCSPB) was developed. The new structure aims at overcoming the shortcomings of both randomly packed beds and traditional structured packed beds. A naphthalene sublimation experiment is conducted to measure the pressure drop and heat transfer in GSCSPB and evaluations of the comprehensive heat transfer performance are made to compare the GSCSPB with the randomly packed bed and structured packed bed. A 3-D model is set up to analyze the mechanism of the heat transfer enhancement by using FLUENT 14.0. Results show that firstly, GSCSPB has an excellent design property to reduce the pressure drop of the randomly packed bed and enhance the heat transfer of the structured packed bed, obtaining the highest overall heat transfer performance among the compared packed beds. Secondly, it demonstrates that the existence of the grille wall can change the velocity and temperature distributions, thus the heat transfer is enhanced in GSCSPB compared with a similar configuration without the grille. Finally, it indicates that the grille will help to design a new packing configuration which could achieve a structured packed bed easily and improve the overall heat transfer efficiency.

填充床已广泛用于工业中，其中填充床的流动和传热特性可能会对整个系统的能源效率产生重大影响。填充床的流动和传热特性在很大程度上取决于其结构。因此，开发新的填料结构以提高填料床的整体传热性能至关重要。本文开发了一种格栅球复合结构填充床（GSCSPB）。新的结构旨在克服随机填充床和传统结构填充床的缺点。进行了萘升华实验以测量GSCSPB中的压降和传热，并对综合传热性能进行评估，以将GSCSPB与随机填充床和结构填充床进行比较。建立了一个3-D模型，以使用FLUENT 14.0分析传热增强的机理。结果表明，首先，GSCSPB具有出色的设计性能，可减少无规填充床的压降并增强结构填充床的传热，从而在比较的填充床中获得最高的整体传热性能。其次，它表明格栅壁的存在可以改变速度和温度分布，因此与没有格栅的类似构造相比，GSCSPB中的传热得到了增强。最后，