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<p>Results of investigation into the influence of the exhaust shaft on local and integral heat transfer in thermogravitational air flow through a double-row bundle of horizontal finned tubes have been presented. Experiments on measuring the integral heat transfer were conducted for two configurations with fixed geometric parameters of the bundle: with the arrangement above the bundle of the exhaust shaft of height one order of magnitude larger than the fins’ diameter and without an exhaust shaft. Three-dimensional numerical simulation has been carried out on the basis of solution of nonstationary Navier–Stokes equations under the assumption of periodicity of the flow with a fin pitch. Consistent calculated and experimental data have been obtained on the values of the integral Nusselt number, which show that the installation of the exhaust shaft entails an increase of five times in the Nusselt number. According to the results of numerical simulation, an analysis of the flow structure in an interfin space and of local heat-transfer characteristics has been made.</p>

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Influence of the Exhaust Shaft with Partition Plates on Heat Transfer in Thermogravitational Air Flow Through a Double-Row Bundle of Finned Tubes

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • A. G. Abramov,
  • E. S. Danil’chik,
  • M. A. Zasimova,
  • G. S. Marshalova,
  • A. A. Pozhilov,
  • E. M. Smirnov,
  • A. B. Sukhotskii

摘要

Results of investigation into the influence of the exhaust shaft on local and integral heat transfer in thermogravitational air flow through a double-row bundle of horizontal finned tubes have been presented. Experiments on measuring the integral heat transfer were conducted for two configurations with fixed geometric parameters of the bundle: with the arrangement above the bundle of the exhaust shaft of height one order of magnitude larger than the fins’ diameter and without an exhaust shaft. Three-dimensional numerical simulation has been carried out on the basis of solution of nonstationary Navier–Stokes equations under the assumption of periodicity of the flow with a fin pitch. Consistent calculated and experimental data have been obtained on the values of the integral Nusselt number, which show that the installation of the exhaust shaft entails an increase of five times in the Nusselt number. According to the results of numerical simulation, an analysis of the flow structure in an interfin space and of local heat-transfer characteristics has been made.