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Modeling of Turbulent Heat-Transfer Augmentation in Gas-Droplet Non-Boiling Flow in Diverging and Converging Axisymmetric Ducts with Sudden Expansion

Author

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  • Maksim A. 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 I. 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 effect of positive (adverse) and negative (favorable) longitudinal pressure gradients on the structure and heat transfer of gas-droplet (air and water) flow in axisymmetric duct with sudden expansion are examined. The superimposed pressure gradient has a large influence on the flow structure and heat transfer in a two-phase mist flow in both a confuser and a diffuser. A narrowing of the confuser angle leads to significant suppression of flow turbulence (more than four times that of the gas-drop flow after sudden pipe expansion without a pressure gradient at φ = 0°). Recirculation zone length decreases significantly compared to the gas-droplet flow without a longitudinal pressure gradient (by up to 30%), and the locus of the heat-transfer maximum shifts slightly downstream, and roughly aligns with the reattachment point of the two-phase flow. Growth of the diffuser opening angle leads to additional production of kinetic energy of gas flow turbulence (almost twice as much as gas-droplet flow after a sudden pipe expansion at φ = 0°). The length of the flow recirculating region in the diffuser increases significantly compared to the separated gas-droplet flow without a pressure gradient ( φ = 0°), and the location of maximum heat transfer shifts downstream in the diffuser.

Suggested Citation

  • Maksim A. Pakhomov & Viktor I. Terekhov, 2022. "Modeling of Turbulent Heat-Transfer Augmentation in Gas-Droplet Non-Boiling Flow in Diverging and Converging Axisymmetric Ducts with Sudden Expansion," Energies, MDPI, vol. 15(16), pages 1-12, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:16:p:5861-:d:886819
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    References listed on IDEAS

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    1. Haochuang Wu & Chen Yang & Zonglong Zhang & Qiang Zhang, 2022. "Simulation of Two-Phase Flow and Syngas Generation in Biomass Gasifier Based on Two-Fluid Model," Energies, MDPI, vol. 15(13), pages 1-15, June.
    2. Yongzhong Zeng & Weilin Xu, 2021. "Investigation on Bubble Diameter Distribution in Upward Flow by the Two-Fluid and Multi-Fluid Models," Energies, MDPI, vol. 14(18), pages 1-22, September.
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