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Flow Boiling Heat Transfer Characteristics in Horizontal, Three-Dimensional Enhanced Tubes

Author

Listed:
  • Zhi-Chuan Sun

    (Department of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China)

  • Xiang Ma

    (Department of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, 99 Songling Road, Qingdao 266061, China)

  • Lian-Xiang Ma

    (Department of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, 99 Songling Road, Qingdao 266061, China)

  • Wei Li

    (Department of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China)

  • David J. Kukulka

    (Department of Mechanical Engineering Technology, State University of New York College at Buffalo, 1300 Elmwood Avenue, Buffalo, NY 14222, USA)

Abstract

An experimental investigation was conducted to explore the flow boiling heat transfer characteristics of refrigerants R134A and R410A inside a smooth tube, as well as inside two newly developed surface-enhanced tubes. The internal surface structures of the two enhanced tubes are comprised of protrusions/dimples and petal-shaped bumps/cavities. The equivalent inner diameter of all tested tubes is 11.5 mm, and the tube length is 2 m. The experimental test conditions included saturation temperatures of 6 °C and 10 °C; mass velocities ranging from 70 to 200 kg/(m 2 s); and heat fluxes ranging from 10 to 35 kW/m 2 , with inlet and outlet vapor quality of 0.2 and 0.8. It was observed that the enhanced tubes exhibit excellent flow boiling heat transfer performance. This can be attributed to the complex surface patterns of dimples and petal arrays that increase the active heat transfer area; in addition, more nucleation sites are produced, and there is also an increased interfacial turbulence. Results showed that the boiling heat transfer coefficient of the enhanced surface tubes was 1.15–1.66 times that of the smooth tubing. Also, effects of the flow pattern and saturated temperature are discussed. Finally, a comparison of several existing flow boiling heat transfer models using the data from the current study is presented.

Suggested Citation

  • Zhi-Chuan Sun & Xiang Ma & Lian-Xiang Ma & Wei Li & David J. Kukulka, 2019. "Flow Boiling Heat Transfer Characteristics in Horizontal, Three-Dimensional Enhanced Tubes," Energies, MDPI, vol. 12(5), pages 1-25, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:5:p:927-:d:212590
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    Cited by:

    1. Jiří Jaromír Klemeš & Petar Sabev Varbanov & Paweł Ocłoń & Hon Huin Chin, 2019. "Towards Efficient and Clean Process Integration: Utilisation of Renewable Resources and Energy-Saving Technologies," Energies, MDPI, vol. 12(21), pages 1-32, October.
    2. Yongseok Jeon & Hoon Kim & Jae Hwan Ahn & Sanghoon Kim, 2020. "Effects of Nozzle Exit Position on Condenser Outlet Split Ejector-Based R600a Household Refrigeration Cycle," Energies, MDPI, vol. 13(19), pages 1-12, October.
    3. Ladislav Suk & Taron Petrosyan & Kamil Stevanka & Daniel Vlcek & Pavel Gejdos, 2020. "Experimental Investigation of Critical Heat Flux on Different Surfaces at Low Pressure and Low Flow," Energies, MDPI, vol. 13(19), pages 1-23, October.
    4. Magdalena Piasecka & Kinga Strąk, 2021. "Characteristics of Refrigerant Boiling Heat Transfer in Rectangular Mini-Channels during Various Flow Orientations," Energies, MDPI, vol. 14(16), pages 1-30, August.

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