波节管纵向逆流换热性能的三维数值模拟研究

本文基于k-ε模型,针对波节管高效换热元件中纵向逆流换热的传热特性和阻力特性进行三维数值模拟研究。传热工质在管程和壳程分别为氦气和氮气,管束采用三角形布置。本文首先分析了不同波距及雷诺数下对换热量影响。为了体现高效换热元件比光管的优越性,随后分析了不同波距及雷诺数对Q/Q0(波节管与光管的换热量比)与Δp/Δp0(波节管与光管的压力降比)。最后得出结论,波距L的增加使高效换热元件的传热性能和阻力性能有所降低,但提高了其综合传热性能。雷诺数的增加会大幅提高换热量,但同时综合传热效率也大幅降低。

3D Numerical Simulation Investigation of Heat Transfer Performance for Vertical Countercurrent Flow in Corrugated Tube

In this article,the 3D k-ε Model numerical simulation is adopted to research heat transfer and frictional characteristic of the vertical countercurrent flow in corrugated tube.The working medium was helium and nitrogen in the tube side and shell side respectively.The tube bundle has used triangular arrangement.The paper has first analyzed the impact of different wave distance and Reynolds number on heat transfer rate.At the same time,the impact of different wave distance and Reynolds number on Q/Q0（heat transfer ratio between smooth and corrugated tube） and Δp/Δp0（pressure loss ratio between smooth and corrugated） were also analyzed in order to emphasize the superiority of corrugated tube.It was found that the heat transfer and frictional characteristic of corrugated tube have decreased with the increasing of wave length,whereas the overall heat transfer performance has been improved.On the contrary,the Reynolds number has the opposite effect.