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Numerical Investigation of Flow and Heat Transfer in the 7×7 Multi-channel of CC Primary Surface Recuperators

机译：CC主表面换热器7×7多通道流动和传热的数值研究

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摘要

The investigations on the three-dimensional steady laminar flow and heat transfer characteristics for the 7×7 multi-channel with the sine-wave crossed-corrugated primary surface are conducted using numerical simulation in this paper. Comparing the results with those obtained from 5×5 multi-channel, we find that the results from 7×7 multi-channel are more approaching to the experiment’s results, and the relative error is much less than that from 5×5 cells’. Besides, a complete analysis on the flow and heat transfer performance from 0 to 90 degrees are supplemented in this paper. And the effects of the different ratio of the wave length P to height H (P/H) on the flow and heat transfer performance are studied simultaneously. The results show that, under the condition of the same P/H, Nusselt number (Nu) and friction factor (f) increase with the increasing θ. Nu increases when the Reynolds (Re) enhances, while f decreases. In addition, Nu ascends with the enhancing P/H when it is between 1 and 3, while f has nearly no change. But they both descend when it is between 3 and 4. With the comprehensive consideration of all aspects, the recuperator with better performance is optimized and designed.
机译：本文利用数值模拟方法研究了正弦波交叉波纹主表面的7×7多通道三维稳态层流和传热特性。将结果与从5×5多通道获得的结果进行比较，我们发现7×7多通道的结果更接近实验结果，相对误差远小于5×5单元的误差。此外，本文还补充了对0至90度之间的流动和传热性能的完整分析。同时研究了波长P与高度H之比（P / H）对流动和传热性能的影响。结果表明，在相同的P / H条件下，努塞尔特数（Nu）和摩擦系数（f）随着θ的增大而增大。当雷诺（Re）增强时，Nu增加，而f减小。另外，当N在1和3之间时，N随着增强的P / H上升，而f几乎没有变化。但是当它们在3到4之间时，它们都会下降。综合考虑所有方面，对性能更好的换热器进行了优化和设计。

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