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首页> 外文期刊>International Journal of Heat and Mass Transfer >Compound convective heat transfer enhancement in helically coiled wall corrugated tubes
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Compound convective heat transfer enhancement in helically coiled wall corrugated tubes

机译：螺旋盘绕波纹管中复合对流换热的增强

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摘要

The objective of the research was to investigate the passive compound heat transfer enhancement technique achievable by combining the effect of wall curvature and of wall corrugation. To this aim, the forced convective heat transfer in helically coiled smooth and corrugated wall tubes was studied in the Reynolds and Dean number ranges 70 ÷ 1200 and 12 ÷ 290 respectively, by adopting Ethylene Glycol as working fluid. Three different curvature ratio values were considered i.e. 0.031, 0.040 and 0.056, while the wall corrugation profile was held constant. For low De values the wall curvature effect prevailed, and the heat transfer enhancement was nearly the same for the corrugated and the smooth helically coiled tubes. For higher De values instead, the wall corrugation brought a further heat transfer enhancement with respect to the wall curvature. This behavior could be explained as a consequence of an early departure from the steady laminar flow regime, as it happens in straight wall corrugated tubes. With this regard a critical Dean number value equal to 120 was identified. The results showed that the effect of the wall curvature alone brings heat transfer enhancement in the range 2 ÷ 10 over the straight smooth wall tube against pressure drop penalties augmentation in the range 1 ÷ 1.5, while for the helical coiled wall corrugated tubes an heat transfer augmentation over the straight smooth wall behavior of up to 25 was registered against a maximum friction factor increase of 2.5. The present research highlights that the simultaneous use of the two passive heat transfer enhancement techniques (wall curvature compounded with wall corrugation) is particularly effective if compared to the performance achievable through their separate use.
机译：该研究的目的是研究通过结合壁曲率和壁波纹的影响而获得的被动复合传热增强技术。为此，采用乙二醇作为工作流体，分别在雷诺数和迪安数范围70〜1200和12〜290中研究了螺旋盘绕的光滑和波纹壁管中的强制对流传热。三种不同的曲率比值分别为0.031、0.040和0.056，而壁波纹轮廓保持不变。对于低De值，主要存在壁曲率效应，对于波纹管和光滑螺旋盘管，传热增强几乎相同。相反，对于更高的De值，壁波纹相对于壁曲率带来了进一步的传热增强。这种现象可以解释为是由于在线性直壁波纹管中发生了早期偏离稳定层流状态的结果。就此而言，确定了等于120的临界Dean值。结果表明，单是壁曲率的影响就比直管光滑壁管的传热增强了2÷10，而压降损失却在1÷1.5的范围内增大，而螺旋盘绕波纹管的传热增强了。在最大的摩擦系数增加2.5的情况下，增加了高达25的笔直光滑壁性能的增强。本研究突出显示，与通过单独使用可获得的性能相比，同时使用两种被动传热增强技术（壁曲率与壁波纹复合）特别有效。

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    S. Rainieri; F. Bozzoli; L. Cattani; G. Pagliarini;

  • 作者单位

    Department of Industrial Engineering, University of Parma, Parco Area delle Scienze 181/A, I-43124 Parma, Italy SITEIA.PARMA Interdepartmental Centre, University of Parma, Parco Area delle Scienze 181/A, I-43124 Parma, Italy;

    Department of Industrial Engineering, University of Parma, Parco Area delle Scienze 181/A, I-43124 Parma, Italy;

    Department of Industrial Engineering, University of Parma, Parco Area delle Scienze 181/A, I-43124 Parma, Italy;

    Department of Industrial Engineering, University of Parma, Parco Area delle Scienze 181/A, I-43124 Parma, Italy SITEIA.PARMA Interdepartmental Centre, University of Parma, Parco Area delle Scienze 181/A, I-43124 Parma, Italy;

  • 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

    Compound heat transfer enhancement; Helically coiled tubes; Corrugated tubes;

    机译：复合传热增强;螺旋盘管;波纹管;

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