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Flow and Heat Transfer Characteristics of a Swirling Impinging Jet Issuing from a Threaded Nozzle of 45 Degrees

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Listed:
  • Liang Xu

    (State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Tao Yang

    (State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Yanhua Sun

    (State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Lei Xi

    (State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Jianmin Gao

    (State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Yunlong Li

    (State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

In order to achieve uniform and effective impingement cooling, a swirling jet with a swirling angle of 45° (SIJ 45°) is put forward in this paper. Namely, there are four 45° spiral grooves equipped on the inner wall of the circular hole. The difference in the flow field and heat transfer characteristics between the conventional impinging jet (CIJ) and SIJ 45 ° is compared and analyzed. The spiral channels can increase the heat transfer rate and cooling uniformity because of the action of superimposed airflow. In addition, the thread nozzle brings lower pressure loss, which can reduce the airflow friction while effectively ensuring high heat transfer in the center area of the jet. An experimental system is built to investigate the heat transfer and flow characteristics of the impingement surface. Smoke flow visualization technology is used to explore the complex flow field of the CIJ and SIJ 45 ° , and the heat transfer rate of the target surface is analyzed based on thermocouple data. When 6000 ≤ R e ≤ 30,000 , and 1 ≤ h / d j ≤ 8 , the averaged Nusselt number ( Nu ) correlation for SIJ 45° is established, which is in good agreement with the experimental results. SIJ 45° is an effective measure to replace the CIJ, and the research herein provides some reference for designing the structure of new jets.

Suggested Citation

  • Liang Xu & Tao Yang & Yanhua Sun & Lei Xi & Jianmin Gao & Yunlong Li, 2021. "Flow and Heat Transfer Characteristics of a Swirling Impinging Jet Issuing from a Threaded Nozzle of 45 Degrees," Energies, MDPI, vol. 14(24), pages 1-26, December.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:24:p:8412-:d:701585
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    References listed on IDEAS

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    1. Abdulrahman H. Alenezi & Abdulrahman Almutairi & Hamad M. Alhajeri & Abdulmajid Addali & Abdelaziz A. A. Gamil, 2018. "Flow Structure and Heat Transfer of Jet Impingement on a Rib-Roughened Flat Plate," Energies, MDPI, vol. 11(6), pages 1-16, June.
    2. Yulong Yang & Han Liu & Weixuan Mao & Zhaojie Song & Haizhu Wang, 2020. "Study on the Impact Pressure of Swirling-Round Supercritical CO 2 Jet Flow and Its Influencing Factors," Energies, MDPI, vol. 14(1), pages 1-15, December.
    3. Pablo Martínez-Filgueira & Ekaitz Zulueta & Ander Sánchez-Chica & Unai Fernández-Gámiz & Josu Soriano, 2019. "Multi-Objective Particle Swarm Based Optimization of an Air Jet Impingement System," Energies, MDPI, vol. 12(9), pages 1-16, April.
    4. Tomasz Kura & Jan Wajs & Elzbieta Fornalik-Wajs & Sasa Kenjeres & Sebastian Gurgul, 2020. "Thermal and Hydrodynamic Phenomena in the Stagnation Zone—Impact of the Inlet Turbulence Characteristics on the Numerical Analyses," Energies, MDPI, vol. 14(1), pages 1-20, December.
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    Cited by:

    1. Cao, Yan & Ayed, Hamdi & Hashemian, Mehran & Issakhov, Alibek & Jarad, Fahd & Wae-hayee, Makatar, 2021. "Inducing swirl flow inside the pipes of flat-plate solar collector by using multiple nozzles for enhancing thermal performance," Renewable Energy, Elsevier, vol. 180(C), pages 1344-1357.

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