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首页> 外文期刊>International Journal of Heat and Mass Transfer >Characteristics of heat transfer for tube banks in crossflow and its relation with that in shell-and-tube heat exchangers
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Characteristics of heat transfer for tube banks in crossflow and its relation with that in shell-and-tube heat exchangers

机译：横流管束的传热特性及其与管壳式换热器的关系

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摘要

The thermodynamics performances for tube banks in crossflow and for the shell sides of shell-and-tube heat exchangers were investigated, and the relation of fluid flow and heat transfer between them were analyzed. The results indicate that the incline degree of tube does not lead to obvious change on characteristics of fluid flow and heat transfer for fluid flowing across tube banks. Under different incline degrees of tubes, the characteristics of fluid flowing across tube banks are similar concerning fluid velocity components and local heat transfer along across angles. The ratios of vertical velocity component to parallel velocity component remain about 4.2 in the banks. Decreasing of impacting angle in the model reduces average fluid velocity crossing tubes, which weakens heat transfer. Characteristics for fluid flowing across tube bundles in shell sides distinguish from that for tube banks in crossflow with different impacting angles. At the same mass rate, the values of parallel velocity components in different shell sides are equivalent, but the vertical velocity components vary greatly. The ratios of vertical velocity component to parallel velocity component change from about 0.33-0.92 in the three types of shell sides. Many different leakage paths and bypass streams leads complicated fluid flow in shell sides of heat exchangers. The complicated flow pattern is not a simple combination of fluid flowing across tube banks with different impacting angles. The thermodynamics performance of shell side depends greatly on the vertical velocity component of fluid. The achievement in the paper can be a reference for study and development of heat exchanger.
机译：研究了横流管束和管壳式换热器壳侧的热力学性能，并分析了它们之间的流体流动和传热关系。结果表明，管子的倾斜度不会导致流体流动特性和流过管束的流体的传热特性发生明显变化。在管子不同的倾斜度下，流过管束的流体的特性在流体速度分量和沿整个角度的局部热传递方面是相似的。堤岸中垂直速度分量与平行速度分量之比保持约4.2。模型中冲击角的减小会降低横管的平均流体速度，从而削弱传热。穿过壳侧管束的流体的特性不同于具有不同冲击角的错流管束的特性。在相同的质量速率下，不同壳侧的平行速度分量的值是相等的，但垂直速度分量的变化很大。在三种类型的壳体侧面中，垂直速度分量与平行速度分量之比从约0.33-0.92变化。许多不同的泄漏路径和旁路流导致热交换器壳体侧的流体复杂流动。复杂的流动模式不是流经具有不同冲击角的管束的流体的简单组合。壳侧的热力学性能在很大程度上取决于流体的垂直速度分量。本文的研究成果可为换热器的研究和开发提供参考。

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  • 来源
  • 作者

    Yongqing Wang; Xin Gu; Zunlong Jin; Ke Wang;

  • 作者单位

    Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou 450002, China;

    Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou 450002, China;

    Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou 450002, China;

    Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou 450002, 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

    Heat exchanger; Tube bank; Fluid flow; Heat transfer enhancement; Velocity components;

    机译：热交换器;管束;流体流量;传热增强;速度分量;

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