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Experimental and numerical study on heat transfer and flow characteristics in an alternating cross-section flattened tube

机译：交替截面扁平管中传热和流动特性的实验性和数值研究

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摘要

An experimental and numerical study on convection heat transfer of water flowing through an alternating cross-section flattened (ACF) tube are investigated in this paper. The thermal-fluid characteristics were evaluated by numerical simulation. The test run conditions covered a mass flux of 200 to 800 kg m~(-2) s~(-1) a heat flux of 10kW/m~2, and an inlet temperature of 40°C. The results showed that the Nusselt number increased with the increase in mass flux. Moreover, the heat transfer was also affected by the flow characteristics. Vortices were formed at the curved wall, and their intensities were increased along the flow direction. It was also found that the heat transfer and pressure drop were larger than that of the circular tube. However, the thermal performance was greater than the pressure loss penalty. The comparison results showed that the ACF tube had better performance than the circular tube. Further, the details of heat transfer, flow resistance, and fluid behavior were investigated and discussed in this study.
机译：本文研究了流过交替横截面扁平（ACF）管的对流热传递的实验和数值研究。通过数值模拟评估热流体特性。测试运行条件涵盖了200至800kg m〜（-2）S〜（-1）的质量通量，10kW / m〜2的热通量，进入温度为40℃。结果表明，南部数量随质量磁通量的增加而增加。此外，传热也受到流动特性的影响。在弯曲壁上形成漩涡，并且它们的强度沿着流动方向增加。还发现热传递和压降大于圆形管的压力下降。但是，热性能大于压力损失损失。比较结果表明，ACF管的性能比圆形管更好。此外，在本研究中研究并讨论了传热，流动性和流体行为的细节。

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  • 来源
    《Heat transfer》 |2019年第3期|817-834|共18页
  • 作者

    Amawasee Rukruang; Nares Chimres; Jatuporn Kaew-On; Somchai Wongwises;

  • 作者单位

    Energy Engineering Program Faculty of Engineering Thaksin University Phatthalung Thailand;

    Fluid Mechanics Thermal Engineering and Multiphase Flow Research Lab (FUTURE) Department of Mechanical Engineering Faculty of Engineering King Mongkut's University of Technology Thonburi Bangmod Bangkok Thailand;

    Energy Engineering Program Faculty of Engineering Thaksin University Phatthalung Thailand Fluid Mechanics Thermal Engineering and Multiphase Flow Research Lab (FUTURE) Department of Mechanical Engineering Faculty of Engineering King Mongkut's University of Technology Thonburi Bangmod Bangkok Thailand;

    Fluid Mechanics Thermal Engineering and Multiphase Flow Research Lab (FUTURE) Department of Mechanical Engineering Faculty of Engineering King Mongkut's University of Technology Thonburi Bangmod Bangkok Thailand The Academy of Science The Royal Society of Thailand Sanam Suea Pa Dusit Bangkok Thailand;

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

    alternating flattened (AF) tube; computational fluid dynamics (CFD); flow characteristics; heat transfer enhancement; vortex generation;

    机译：交替扁平（AF）管;计算流体动力学（CFD）;流动特性;传热增强;涡旋生成;

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