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首页> 外文期刊>Journal of Heat Transfer >Second-Law Thermodynamic Comparison and Maximal Velocity Ratio Design of Shell-and-Tube Heat Exchangers With Continuous Helical Baffles
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Second-Law Thermodynamic Comparison and Maximal Velocity Ratio Design of Shell-and-Tube Heat Exchangers With Continuous Helical Baffles

机译：连续螺旋折流板壳管式换热器的第二法热力学比较和最大速度比设计

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摘要

Shell-and-tube heat exchangers (STHXs) have been widely used in many industrial processes. In the present paper, flow and heat transfer characteristics of the shell-and-tube heat exchanger with continuous helical baffles (CH-STHX) and segmental baffles (SG-STHX) were experimentally studied. In the experiments, these STHXs shared the same tube bundle, shell geometrical structures, different baffle arrangement, and number of heat exchange tubes. Experimental results suggested that the CH-STHX can increase the heat transfer rate by 7-12% than the SG-STHX for the same mass flow rate although its effective heat transfer area had 4% decrease. The heat transfer coefficient and pressure drop of the CH-STHX also had 43-53% and 64-72% increase than those of the SG-STHX, respectively. Based on second-law thermodynamic comparisons in which the quality of energy are evaluated by the entropy generation number and exergy losses, the CH-STHX decreased the entropy generation number and exergy losses by 30% and 68% on average than the SG-STHX for the same Reynolds number. The analysis from nondi-mensional correlations for Nusselt number and friction factor also revealed that if the maximal velocity ratio R >2.4, the heat transfer coefficient of CH-STHX was higher than that of SG-STHX, and the corresponding friction factor ratio kept at constant f_(o,CH_/f_(o,SG)=0.28.
机译：壳管式热交换器（STHX）已广泛用于许多工业过程。本文对具有连续螺旋折流板（CH-STHX）和分段折流板（SG-STHX）的管壳式换热器的流动和传热特性进行了实验研究。在实验中，这些STHX共享相同的管束，壳的几何结构，不同的挡板布置以及换热管的数量。实验结果表明，在相同质量流量下，CH-STHX的传热率比SG-STHX提高了7-12％，尽管其有效传热面积减少了4％。 CH-STHX的传热系数和压降也分别比SG-STHX的高43-53％和64-72％。根据第二定律热力学比较，其中能量的质量由熵产生数和本能损失评估，CH-STHX与SG-STHX相比，平均减少了30％和68％。相同的雷诺数。从努氏数和摩擦系数的三维关系中分析还发现，如果最大速度比R> 2.4，则CH-STHX的传热系数高于SG-STHX，并且相应的摩擦系数比保持在常数f_（o，CH_ / f_（o，SG）= 0.28。

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  • 来源
    《Journal of Heat Transfer》 |2010年第10期|P.101801.1-101801.9|共9页
  • 作者

    Qiu-Wang Wang; rnGui-Dong Chen; rnJingXu; rnYan-Peng Ji;

  • 作者单位

    State Key Laboratory of Multiphase Flow in Power Engineering,School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049, China;

    rnState Key Laboratory of Multiphase Flow in Power Engineering,School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049, China;

    rnState Key Laboratory of Multiphase Flow in Power Engineering,School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049, China;

    rnState Key Laboratory of Multiphase Flow in Power Engineering,School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    continuous helical baffles; segmental baffles; entropy generation number; exergy losses; second-law thermodynamic analysis; shell-and-tube heat exchangers;

    机译：连续的螺旋形挡板分段挡板熵产生数火用损失;第二定律热力学分析;壳管式热交换器;

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