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首页> 外文期刊>Energy Conversion & Management >Performance investigation of an innovative offset strip fin arrays in compact heat exchangers
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Performance investigation of an innovative offset strip fin arrays in compact heat exchangers

机译：紧凑型热交换器中创新的带状翅片阵列的性能研究

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摘要

Experimental and numerical studies on the flow and heat transfer characteristics for an innovative offset strip fins compact heat exchangers were performed. First, five fin schemes were investigated with various air flow velocities and a constant inlet steam pressure by experiments. The Reynolds number ranged from 500 to 5000 at the air side. The experimental results indicated that the fin pitch (P_ƒ), fin length (L_ƒ) and fin bending distance (C_ƒ) have a significant influence on thermal performance of fins. The Colburn factor j, friction factor ƒ and 'point of transition' were calculated from the experimental data. Then, the thermal-hydraulic performances of the novel offset strip fins were analyzed numerically. The simulation results obtained are in agreement with experimental data. Based on these simulations, the maximum values for local Nu number are at the channel inlet which is due to the thermal entrance effect. The longitudinal vortexes near the fin region will increase velocity gradient and reduce the thickness of boundary layer to improve heat transfer. The main conclusion draws from this work will be helpful for future development and design of a high-efficiency heat exchangers involving offset strip fin structures.
机译：进行了创新的带状翅片紧凑型热交换器的流动和传热特性的实验和数值研究。首先，通过实验研究了五种翅片方案，它们具有不同的空气流速和恒定的入口蒸汽压力。雷诺数在空气侧为500到5000。实验结果表明，翅片间距（P_ƒ），翅片长度（L_ƒ）和翅片弯曲距离（C_ƒ）对翅片的热性能有重要影响。从实验数据中计算出了柯本系数j，摩擦系数ƒ和“转变点”。然后，数值分析了新型偏置条形翅片的热工性能。仿真结果与实验数据吻合。基于这些模拟，由于热量进入效应，局部Nu数的最大值在通道入口处。鳍片区域附近的纵向涡流将增加速度梯度并减小边界层的厚度，以改善热传递。从这项工作中得出的主要结论将有助于未来开发和设计涉及偏置带状翅片结构的高效热交换器。

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  • 来源
    《Energy Conversion & Management》 |2014年第4期|287-297|共11页
  • 作者

    Hao Peng; Xiang Ling; Juan Li;

  • 作者单位

    Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing University of Technology, No. 30 Pu Zhu South Road, Nanjing 211816, PR China;

    Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing University of Technology, No. 30 Pu Zhu South Road, Nanjing 211816, PR China,No. 30 Pu Zhu South Road, Nanjing 211816, Jiangsu Province, PR China;

    Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing University of Technology, No. 30 Pu Zhu South Road, Nanjing 211816, PR 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

    Compact heat exchanger; Offset strip fin; Thermal entrance effect; Colburn factor; Friction factor;

    机译：紧凑型热交换器;偏移带状翅片;热入口效应;科尔本因子摩擦系数;

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