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Experimental and Numerical Study of the Flow and Heat Transfer in a Bubbly Turbulent Flow in a Pipe with Sudden Expansion

Author

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  • Pavel Lobanov

    (Laboratory of Problems of Heat and Mass Transfer, Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences, Acad. Lavrent’ev Avenue 1, 630090 Novosibirsk, Russia)

  • Maksim Pakhomov

    (Laboratory of Thermal and Gas Dynamics, Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences, Acad. Lavrent’ev Avenue 1, 630090 Novosibirsk, Russia)

  • Viktor Terekhov

    (Laboratory of Thermal and Gas Dynamics, Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences, Acad. Lavrent’ev Avenue 1, 630090 Novosibirsk, Russia)

Abstract

The flow patterns and heat transfer of a downstream bubbly flow in a sudden pipe expansion are experimentally and numerically studied. Measurements of the bubble size were performed using shadow photography. Fluid phase velocities were measured using a PIV system. The numerical model was employed the Eulerian approach. The set of RANS equations was used for modelling two-phase bubbly flows. The turbulence of the carrier liquid phase was predicted using the Reynolds stress model. The peak of axial and radial fluctuations of the carrier fluid (liquid) velocity in the bubbly flow is observed in the shear layer. The addition of air bubbles resulted in a significant increase in the heat transfer rate (up to 300%). The main enhancement in heat transfer is observed after the point of flow reattachment.

Suggested Citation

  • Pavel Lobanov & Maksim Pakhomov & Viktor Terekhov, 2019. "Experimental and Numerical Study of the Flow and Heat Transfer in a Bubbly Turbulent Flow in a Pipe with Sudden Expansion," Energies, MDPI, vol. 12(14), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2735-:d:249163
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    References listed on IDEAS

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    1. Tenglong Cong & Xiang Zhang, 2018. "Numerical Study of Bubble Coalescence and Breakup in the Reactor Fuel Channel with a Vaned Grid," Energies, MDPI, vol. 11(1), pages 1-16, January.
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    Cited by:

    1. Giuseppe Starace & Lorenzo Carrieri & Gianpiero Colangelo, 2020. "Semi-Analytical Model for Heat and Mass Transfer Evaluation of Vapor Bubbling," Energies, MDPI, vol. 13(5), pages 1-17, March.
    2. Mikhail A. Sheremet, 2021. "Numerical Simulation of Convective-Radiative Heat Transfer," Energies, MDPI, vol. 14(17), pages 1-3, August.

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