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Numerical Study of Heat Transfer in Gravity-Driven Particle Flow around Tubes with Different Shapes

Author

Listed:
  • Xing Tian

    (Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China)

  • Jian Yang

    (Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China
    Department of Energy Sciences, Lund University, 22100 Lund, Sweden)

  • Zhigang Guo

    (Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China)

  • Qiuwang Wang

    (Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China)

  • Bengt Sunden

    (Department of Energy Sciences, Lund University, 22100 Lund, Sweden)

Abstract

In the present paper, the heat transfer of gravity-driven dense particle flow around five different shapes of tubes is numerically studied using discrete element method (DEM). The velocity vector, particle contact number, particle contact time and heat transfer coefficient of particle flow at different particle zones around the tube are carefully analyzed. The results show that the effect of tube shape on the particle flow at both upstream and downstream regions of different tubes are remarkable. A particle stagnation zone and particle cavity zone are formed at the upstream and downstream regions of all the tubes. Both the stagnation and cavity zones for the circular tube are the largest, and they are the smallest for the elliptical tube. As the particle outlet velocity ( v out ) changes from 0.5 mm/s to 8 mm/s at d p = 1.72 mm/s, when compared with the circular tube, the heat transfer coefficient of particle flow for the elliptical tube and flat elliptical tube can increase by 20.3% and 15.0% on average, respectively. The proper design of the downstream shape of the tube can improve the overall heat transfer performance more efficiently. The heat transfer coefficient will increase as particle diameter decreases.

Suggested Citation

  • Xing Tian & Jian Yang & Zhigang Guo & Qiuwang Wang & Bengt Sunden, 2020. "Numerical Study of Heat Transfer in Gravity-Driven Particle Flow around Tubes with Different Shapes," Energies, MDPI, vol. 13(8), pages 1-15, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:8:p:1961-:d:346148
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    References listed on IDEAS

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    Cited by:

    1. Tian, Xing & Jia, Haonan & Zhang, Jiayue & Guo, Zhigang & Yang, Jian & Wang, Qiuwang, 2023. "Heat transfer characteristic of particle flow around the out-wall of different geometries," Energy, Elsevier, vol. 280(C).
    2. Baoping Gong & Hao Cheng & Yongjin Feng & Xiaofang Luo & Long Wang & Xiaoyu Wang, 2021. "Effect of Pebble Size Distribution and Wall Effect on Inner Packing Structure and Contact Force Distribution in Tritium Breeder Pebble Bed," Energies, MDPI, vol. 14(2), pages 1-22, January.
    3. Xing Tian & Jian Yang & Zhigang Guo & Qiuwang Wang, 2021. "Numerical Investigation of Gravity-Driven Granular Flow around the Vertical Plate: Effect of Pin-Fin and Oscillation on the Heat Transfer," Energies, MDPI, vol. 14(8), pages 1-14, April.
    4. Yee Van Fan & Zorka Novak Pintarič & Jiří Jaromír Klemeš, 2020. "Emerging Tools for Energy System Design Increasing Economic and Environmental Sustainability," Energies, MDPI, vol. 13(16), pages 1-25, August.

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