中文摘要：

本文用稳态层流模型对几种具有不同肋片间距的环型通道内的流动和换热进行了数值模拟。计算结果表明：长直肋片截断后，流动和换热沿长度方向具有周期性的入口段效应，从而增强了换热。与长直肋片通道相比，βL=13／7时，换热增强了27％，而阻力仅增加6．8％。对于带肋环形通道，Re数增大，换热增强。

英文摘要：

Laminar flow in steady has been used in this numerical simulation to analyze the flow and heat exchange in the annular duct with interlaced ribs. The results show that there is a periodic inlet-effect along the direction of length. An important parameter was introduced here to analyze better heat transfer and resistance condition. In the final conclusion, progress has been made. The best results were got when βL=13/7 which contribute 27% to the heat transfer comparing with the normal ducts with straight ribs, but the increase of flow resistance only increase about 6.8%. The influence of Re was also be found in the research.