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Experimental Studies on Thermal Performance and Flow Resistance of Heat Exchangers with Helical Baffles

机译：螺旋折流板换热器的热性能和流阻的实验研究

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摘要

In this study, the shell-side heat transfer performance and flow resistance of the shell-and-tube heat exchangers with third-symmetrical, quarter-symmetrical, quarter-unsymmetrical helical baffles and segmental baffles were experimentally obtained. Except for the baffles, these heat exchangers had the same geometrical configuration and number of tubes. Cold and hot water were used as working fluids in the shell and the tube side, respectively. The experiments were done with the cold water volumetric flow rate ranging between 3 and 7 m~3/h and the hot water volumetric flow rate constant at 5.5 m~3/h. The results show that the heat exchanger with segmental baffles has higher shell-side heat transfer performance and flow resistance than those with helical baffles. Among the three helical baffles used, the third-symmetrical helical baffle offers the highest shell-side heat transfer performance and flow resistance. The quarter-unsymmetrical helical baffle offers the lowest shell-side flow resistance. Its performance of shell-side heat transfer is also the lowest one but close to that of the quarter-symmetrical helical baffle, so the quarter-unsymmetrical helical baffle provides the best conversion efficiency in all heat exchangers mentioned. Compared with the segmental baffle, the shell-side Nusselt numbers that the third-symmetrical, the quarter-symmetrical, and the quarter-unsymmetrical helical baffle offer decrease on the average by about 26%, 37%, and 38%, respectively, and the corresponding shell-side Euler numbers they provide decrease on the average by about 33%, 49%, and 55%, respectively. Thus, the relative shell-side conversion efficiencies increase by about 9%, 25%, and 39% on the average, respectively.
机译：在本研究中，通过实验获得了具有第三对称，四分之一对称，四分之一非对称螺旋折流板和分段折流板的管壳式换热器的壳侧传热性能和流阻。除了挡板之外，这些热交换器的几何构型和管数相同。冷水和热水分别用作壳体和管侧的工作流体。实验是在3至7 m〜3 / h的冷水体积流量和5.5 m〜3 / h的热水体积流量恒定范围内进行的。结果表明，分段式换热器比螺旋式换热器具有更高的壳侧传热性能和流阻。在使用的三个螺旋挡板中，第三对称螺旋挡板提供了最高的壳侧传热性能和流阻。四分之一不对称的螺旋挡板提供了最低的壳侧流阻。它的壳侧传热性能也是最低的，但接近于四分之一对称螺旋形挡板，因此，四分之一非对称螺旋形挡板在上述所有热交换器中均提供了最佳的转换效率。与分段挡板相比，第三对称，四分之一对称和四分之一不对称的螺旋形挡板提供的壳侧Nusselt数分别平均减少了约26％，37％和38％，并且它们提供的相应的壳侧欧拉数分别平均减少了约33％，49％和55％。因此，相对的壳侧转化效率平均分别提高了约9％，25％和39％。

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  • 来源
    《Heat Transfer Engineering》 |2009年第5期|353-358|共6页
  • 作者

    CHEN WANG; JIA-GUI ZHU; ZHI-FU SANG;

  • 作者单位

    School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu, People's Republic of China;

    Yangzi Petrochemical Maintenance & Installation Co., Ltd., Nanjing, Jiangsu, People's Republic of China;

    School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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