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Experimental investigation of the heat transfer and pressure drop characteristics of SiO_2/water nanofluids flowing through a circular tube equipped with free rotating swirl generators

机译：通过圆管流动的SiO_2 /水纳米流体传热和压降特性的实验研究，配备自由旋转旋流发电机

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摘要

The heat transfer and pressure drop characteristics of SiO_2/water nanofluids flowing through a horizontal circular stainless steel tube equipped with free rotating swirl generators (FRSGs) at the entrance of a test tube are reported in this article. The experimental studies were performed with a Reynolds number ranging from 3500 to 13,000; volume concentrations of 0.5, 1, and 2 vol%; and inlet temperatures of 25, 30, and 35 °C, where a constant heat flux was imposed on a test tube. FRSGs made from aluminum, with three different twisted angles (30°, 60°, and 90°) and a length of 2.3 cm, were located at the entrance of the test tube. The results indicated that FRSGs had significant effects on heat transfer and pressure drop characteristics for the flow of both water and nanofluids in the tube. The Nusselt number increased with increasing volume concentration, inlet temperature, and Reynolds number. However, the friction factor of nanofluids flowing through FRSGs was significantly greater than that of water when the Reynolds number was lower than 6000. This is because FRSGs do not rotate under the given conditions. A maximum efficiency index of 1.57-1.7 was obtained when using SiO_2/water nanofluids with FRSGs at a volume concentration of 2 vol%, inlet temperature of 35 °C, and Reynolds number greater than 7000. On the other hand, the efficiency index value was lower than unity when the Reynolds number was lower than 7000 and with volume concentrations of 0.5 and 1 vol%. No significant differences were found among twisted angles of FRSGs on heat transfer, pressure drop, and efficiency index.
机译：在本文中，在该制品中报道了在测试管的入口处流过配备有自由旋转旋流发生器（FRSGS）的水平圆形不锈钢管的SiO_2 /水纳米流体的传热和压降特性。用3500至13,000的雷诺数进行实验研究;体积浓度为0.5,1，2体积％;和入口温度为25,30和35℃，其中施加在试管上的恒定热通量。 FRSGS由铝制成，具有三个不同的扭曲角度（30°，60°和90°）和长度为2.3厘米，位于试管的入口处。结果表明，FRSGS对管中水和纳米流体流动的热传递和压降特性具有显着影响。由于体积浓度，入口温度和雷诺数，营养数增加。然而，当雷诺数低于6000时，流过FRSGS的纳米流体的摩擦系数明显大于水的摩擦系数。这是因为FRSGS在给定的条件下不旋转。在使用SiO_2 /水纳米流体的体积浓度为2体积浓度，入口温度为35°C，雷诺数大于7000时，获得1.57-1.7的最大效率指数。另一方面，效率指数值当雷诺数低于7000时低于单位，体积浓度为0.5和1体积％。在传热，压降和效率指数上的扭曲角度没有发现扭曲角度的显着差异。

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  • 来源
    《Heat and mass transfer》 |2020年第5期|1613-1626|共14页
  • 作者

    Chaiwat Jumpholkul; Lazarus Godson Asirvatham; Ahmet Selim Dalkilic; Omid Mahian; Ho Seon Ann; Dong-Wook Jerng; Somchai Wongwises;

  • 作者单位

    Mechatronics 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;

    Department of Mechanical Engineering Karunya Institute of Technology and Sciences Coimbatore Tamil Nadu India;

    Heat and Thermodynamics Division Department of Mechanical Engineering Faculty of Mechanical Engineering Yildiz Technical University Yildiz Besiktas Istanbul Turkey;

    School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an China Department of Mechanical Engineering Quchan University of Technology Quchan Iran;

    Department of Mechanical Engineering Incheon National University Incheon Republic of Korea;

    School of Energy System Engineering Chung- Ang University Seoul Republic of Korea;

    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 10300 Thailand;

  • 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

    Efficiency index; Free rotating swirl generators; SiO_2/waternanofluids; Heat transfer enhancement; Pressure drop;

    机译：效率指数;自由旋转旋流发电机;SiO_2 / waternanofluids;传热增强;压力下降;

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