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Heat Transfer Study from a Salty Droplet Film on a Horizontal Tube in Mechanical Vapor Recompression Crystallization System

Author

Listed:
  • Yanmei Cao

    (College of Urban Construction, Nanjing Tech University, Nanjing 211816, China)

  • Yu Wang

    (College of Urban Construction, Nanjing Tech University, Nanjing 211816, China)

  • Yang Gao

    (College of Urban Construction, Nanjing Tech University, Nanjing 211816, China)

  • Risto Kosonen

    (College of Urban Construction, Nanjing Tech University, Nanjing 211816, China
    Department of Mechanical Engineering, Aalto University, 02150 Espoo, Finland)

Abstract

The horizontal drop film evaporator is a key component of the mechanical vapor recompression crystallization system, which can be used to evaporate effluent and recycle secondary vapor energy. However, the properties of heat transfer and flow of the salty effluent sprayed external of the horizontal drop film evaporation tube are obviously different from that of ordinary water. We established a 3D model for a horizontal drop film evaporator in the system, and water and sodium sulfate mixture were manufactured to reproduce the real salty effluent. By applying the VOF (volume of fluid) model, the liquid-gas interface of a salty effluent spray drop film formed on a horizontal tube in the evaporator was traced. The impacts of various heat flux, sodium sulfate content, spray density, and temperature on the local Nusselt number were studied, and a dimensionless correlation was established. The results showed that the effect of surface tension cannot be negligible; as the sodium sulfate content rises, the local Nusselt number declines in the thermal developing region; as the spray temperature and density rises, the local Nusselt number rises, which was largely independent of the heat flux in the thermal developing region.

Suggested Citation

  • Yanmei Cao & Yu Wang & Yang Gao & Risto Kosonen, 2022. "Heat Transfer Study from a Salty Droplet Film on a Horizontal Tube in Mechanical Vapor Recompression Crystallization System," Energies, MDPI, vol. 15(14), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:14:p:5109-:d:861729
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    References listed on IDEAS

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    1. Furqan Tahir & Abdelnasser Mabrouk & Muammer Koç, 2020. "CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal Tube," Energies, MDPI, vol. 13(2), pages 1-15, January.
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    Cited by:

    1. Guojun Yu & Huihao Liu & Huijin Xu, 2023. "New Advancements in Heat and Mass Transfer: Fundamentals and Applications," Energies, MDPI, vol. 16(7), pages 1-4, March.

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