应用于气固两相流环境的三维管综合性能研究

Study on comprehensive performance of three-dimensional tube under gas-solid two-phase flow

三维管高效换热元件在单相流中具有优秀的性能。为了研究三维管高效换热元件在气固两相流介质中的性能,对由4种不同结构参数三维管换热器进行了测试分析。基于不同的综合性能评价方法,对其传热强化性能进行了比较。研究结果表明:三维管截面的长轴与短轴的比值对其传热性能以及流动阻力有重要的影响,并可通过比较其综合性能获得一个合理范围。在4种三维管的综合性能分析结果中,发现Ⅰ型的综合性能因子η_(o-Ⅰ)表现最好,达到了强化的目的,为三维管换热器的优化设计和应用提供了理论依据。

Three-dimensional tubular heat exchanger has excellent heat transfer performance in single-phase flow. Its heat transfer performances in gas-solid two-phase flow were tested and analyzed experimentally with four different structural parameters. Based on different comprehensive performance evaluation methods, the heat transfer enhancement performance was compared. The results showed that the ratio of long axis to short axis of the three-dimensional tube had an important influence on its heat transfer performance and flow resistance. A reasonable ratio could be obtained by comparing its comprehensive performance. The comprehensive performance factor η_(o-I) of type I was the best among four different three-dimensional tubes. The research results could provide beneficial guidance for design and application of the three-dimensional tubular heat exchanger.