【摘要】 扭曲管是应用于制冷行业中新型管壳式换热器的高效换热管,强化了管内传热,壳程不设折流板以降低壳程流阻。本文通过数值模拟研究了扭曲管管内传热及流动特性。通过建立不同规格的扭曲管物理模型,得出扭曲管的扭曲程度S/de越小、截面压扁程度Ai/Bi越大,扭曲管的强化传热性能就越好,但是同时流阻也会增大;反之则相反。更多还原

【Abstract】 Twisted tubes as a new efficient heat transfer tubes which is used in new tubular heat exchanger of refrigeration industry can enhance the heat transfer in the tube side,and do not have baffle plates in the shell side to reduce the pressure drop.The heat transfer performance and flow resistance of twisted tubes in the tube side is investigated by the means of numerical simulation in this paper.Many different specifications physical models of twisted tubes are established to analyze the performance in the tube side.The results show that the distortion of twisted tube and the squash of cross-section is obvious,the heat transfer performance of twisted tube is better,but the flow resistance will also increase.更多还原