A novel shell-and-tube heat exchanger with twisted fluid flow on the shell side is presented. To evaluate the performance, the characteristics of twisted flow and fully developed regions of fluid flow and heat transfer are analyzed numerically and experimentally. The overall structure numerical model of the heat exchanger has been established. A laser Doppler velocimeter (LDV) experiment was carried out to measure the velocity at different positions on the shell side, which verifies the accuracy of the numerical method and results. The characteristics of average velocity, pressure drop and dimensionless temperature were analyzed under different conditions. The results show that the characteristics change periodically in the shell side, and the fully developed regions lie between the second baffle and the penultimate baffle, and the fully developed regions is independent of the fluid flow rate. This method and results provide reference for structural optimization and development of the novel structure of shell-and-tube heat exchanger.

中文翻译：

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旋流换热器充分发育区域的确定与实验研究

提出了一种新型的壳管式换热器，其壳侧具有弯曲的流体流。为了评估性能，对弯曲流动的特征以及流体流动和传热的充分展开区域进行了数值和实验分析。建立了换热器的整体结构数值模型。进行了激光多普勒测速仪（LDV）实验，测量了壳侧不同位置的速度，验证了数值方法和结果的准确性。分析了不同条件下的平均速度，压降和无因次温度的特征。结果表明，该特性在壳侧周期性变化，并且完全展开的区域位于第二挡板和倒数第二挡板之间，完全发达的区域与流体流速无关。该方法和结果为管壳式换热器的结构优化和新结构的开发提供了参考。