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<p>In this study, flat conical inserts arranged in a backward configuration were introduced into a tube heat exchanger. Both numerical and experimental methods were employed to analyse the thermal performance and flow behavior of the heat exchanger with these inserts. The primary objective was to assess the thermal performance factor (TPF), heat transfer, and friction factor under steady-state, turbulent flow conditions. The study focused on the number of flat conical strips (m) and the Reynolds number (Re), with a fixed angle of attack (α = 22°). Using the k-ε turbulence model, simulations were conducted with water as the working fluid, over a Reynolds number range of 3000–8000. Results showed that the configuration with four strips exhibited the highest heat transfer, while the two-strip configuration yielded the lowest heat transfer as Re increased. However, the friction factor was lowest with the two-strip setup, rising significantly with more strips at lower Re. Despite lower heat transfer in the two-strip arrangement, it achieved the highest TPF due to a notably reduced friction factor. The swirling flow created by the flat conical inserts enhanced heat transfer, and the maximum TPF of 1.21 was observed with the two-strip configuration at Re 3000. The numerical findings were in good agreement with experimental data, confirming the reliability of the results.</p>

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Experimental and numerical investigation of influence of flat conical inserts with different geometries in tubular heat exchanger

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Mallikarjuna Veerabhadrappa Bidari,
  • P. B. Nagaraj,
  • Gururaj Lalagi,
  • C. K. Umesh

摘要

In this study, flat conical inserts arranged in a backward configuration were introduced into a tube heat exchanger. Both numerical and experimental methods were employed to analyse the thermal performance and flow behavior of the heat exchanger with these inserts. The primary objective was to assess the thermal performance factor (TPF), heat transfer, and friction factor under steady-state, turbulent flow conditions. The study focused on the number of flat conical strips (m) and the Reynolds number (Re), with a fixed angle of attack (α = 22°). Using the k-ε turbulence model, simulations were conducted with water as the working fluid, over a Reynolds number range of 3000–8000. Results showed that the configuration with four strips exhibited the highest heat transfer, while the two-strip configuration yielded the lowest heat transfer as Re increased. However, the friction factor was lowest with the two-strip setup, rising significantly with more strips at lower Re. Despite lower heat transfer in the two-strip arrangement, it achieved the highest TPF due to a notably reduced friction factor. The swirling flow created by the flat conical inserts enhanced heat transfer, and the maximum TPF of 1.21 was observed with the two-strip configuration at Re 3000. The numerical findings were in good agreement with experimental data, confirming the reliability of the results.