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Heat Transfer Enhancement in Flue-Gas Systems with Radiation-Intensifying Inserts: An Analytical Approach

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  • Justina Menkeliūnienė

    (Department of Energy, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, 51424 Kaunas, Lithuania)

  • Rolandas Jonynas

    (Department of Energy, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, 51424 Kaunas, Lithuania)

  • Linas Paukštaitis

    (Department of Energy, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, 51424 Kaunas, Lithuania)

  • Algimantas Balčius

    (Department of Energy, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, 51424 Kaunas, Lithuania)

  • Kęstutis Buinevičius

    (Department of Energy, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, 51424 Kaunas, Lithuania)

Abstract

A significant portion of energy losses in industrial systems arises from the inefficient use of high-temperature exhaust gases, emphasizing the need for enhanced heat recovery strategies. This study aims to improve energy efficiency by examining the effects of radiation-intensifying inserts on combined radiative and convective heat transfer in flue-gas heated channels. A systematic literature review revealed a research gap in understanding the interaction between these mechanisms in flue-gas heat exchangers. To address this, analytical calculations were conducted for two geometries: a radiation-intensifying plate between parallel plates and the same insert in a circular pipe. The analysis covered a range of gas-flue and wall temperatures (560–1460 K and 303–393 K, respectively), flow velocities, and spectral emissivity values. Key performance metrics included Reynolds and Nusselt numbers to assess flow resistance and heat transfer. Results indicated that flue-gas temperature has the most significant effect on total rate of heat transfer, and the insert significantly enhanced radiative heat transfer by over 60%, increasing flow resistance. A local Nusselt number minimum at a length-to-diameter ratio of approximately 26 suggested transitional flow behavior. These results provide valuable insights for the design of high-temperature heat exchangers, with future work planned to validate the findings experimentally.

Suggested Citation

  • Justina Menkeliūnienė & Rolandas Jonynas & Linas Paukštaitis & Algimantas Balčius & Kęstutis Buinevičius, 2025. "Heat Transfer Enhancement in Flue-Gas Systems with Radiation-Intensifying Inserts: An Analytical Approach," Energies, MDPI, vol. 18(13), pages 1-23, June.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:13:p:3383-:d:1689019
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    References listed on IDEAS

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    1. Gonzalo Suanes & David Bolonio & Antonio Cantero & José Ignacio Yenes, 2024. "Principles for the Design of a Biomass-Fueled Internal Combustion Engine," Energies, MDPI, vol. 17(7), pages 1-21, April.
    2. Kyle Shank & Saeed Tiari, 2023. "A Review on Active Heat Transfer Enhancement Techniques within Latent Heat Thermal Energy Storage Systems," Energies, MDPI, vol. 16(10), pages 1-27, May.
    3. Anton Pulin & Mikhail Laptev & Nikolay Kortikov & Viktor Barskov & Gleb Roschenko & Kirill Alisov & Ivan Talabira & Bowen Gong & Viktor Rassokhin & Anatoly Popovich & Pavel Novikov, 2024. "Numerical Investigation of Heat Transfer Intensification Using Lattice Structures in Heat Exchangers," Energies, MDPI, vol. 17(13), pages 1-18, July.
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