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首页> 外文期刊>International Journal of Heat and Mass Transfer >PIV and thermal-vision experimental and numerical investigation on the airside performance of slotted fin surfaces
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PIV and thermal-vision experimental and numerical investigation on the airside performance of slotted fin surfaces

机译：开缝翅片表面空气侧性能的PIV和热视觉实验和数值研究

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摘要

Experimental and numerical analyses were carried out to study the fluid flow and heat transfer characteristics of two slotted fin surfaces (X-type and Arc-type) in fin-and-tube heat exchangers. Experiments were conducted by using PIV and infrared thermal-vision systems. Good agreement was found between numerical and experimental data under the Reynolds number ranging from 558 to 2235. The results showed that the heat transfer performance of the X-type fin surface was superior to that of the Arc-type fin surface due to more reasonable strips arranging along the flow direction for periodical renewal of the flow and thermal boundary layers, although the Arc-type fin surface could improve the flow pattern and heat transfer characteristics in the weak recirculation zone behind the tube. However, the pressure drop of the X-type fin surface was higher than that of the Arc-type fin surface. A novel improved slotted fin surface (Butterfly-type) was proposed and proved to exhibit the best overall performance. The results of the performance evaluation for the three slotted fin surfaces revealed that the Butterfly-type slotted fin surface could: 1. increase heat duty by approximately 20-24% for FG (fixed geometry) and 1PP (identical pumping power). 2. Reduce pumping power by approximately 38-51% for FG and IHD (identical heat duty). 3. Reduce heat exchange surface area by approximately 21-25% for IPP and IHD. Finally, analysis from the view point of the field synergy principle demonstrated that the improved Butterfly-type slotted fin surface could appreciably reduce the domain average synergy angle between the velocity and temperature gradient, and hence, improve the synergy between the two fields.
机译：进行了实验和数值分析，以研究翅片管式换热器中两个开槽翅片表面（X型和Arc型）的流体流动和传热特性。通过使用PIV和红外热成像系统进行了实验。雷诺数在558到2235之间，数值和实验数据之间发现了很好的一致性。结果表明，由于条形更合理，X型鳍片表面的传热性能优于Arc型鳍片表面的传热性能。沿流动方向排列以周期性地更新流动边界层和热边界层，尽管弧形翅片表面可以改善管后弱循环区域的流动模式和传热特性。但是，X型鳍片表面的压降高于弧形鳍片表面的压降。提出了一种新颖的改进的开槽翅片表面（蝴蝶型），并被证明具有最佳的整体性能。三个开槽翅片表面的性能评估结果表明，蝴蝶型开槽翅片表面可以：1.对于FG（固定几何形状）和1PP（相同的泵送功率），将热负荷提高约20-24％。 2.对于FG和IHD（相同的热负荷），将抽气功率降低约38-51％。 3. IPP和IHD的热交换表面积减少约21-25％。最后，从场协同原理的角度分析表明，改进的蝶形开槽翅片表面可以显着减小速度和温度梯度之间的畴平均协同角，从而改善两个场之间的协同作用。

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  • 作者

    Hongzhi Li; Haijun Wang; Mingyu Yao; Lixin Zhang; Hongfang Gu; Jianping Nie;

  • 作者单位

    National Engineering Research Center of Clean Coal Combustion, Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, PR China;

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

    National Engineering Research Center of Clean Coal Combustion, Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, PR China;

    National Engineering Research Center of Clean Coal Combustion, Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, PR China;

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

    National Engineering Research Center of Clean Coal Combustion, Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, 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

    PIV; Numerical simulation; Heat transfer enhancement; Field synergy; Slotted fin surfaces;

    机译：PIV;数值模拟传热增强;现场协同;开槽翅片表面;

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