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<p>Experimental studies and generalization of the data on heat transfer of a single-row bundle of bimetal tubes with spiral knurled aluminum fins and uniform annular interfin pollution in the regime of free convection to vertical air flows created by an exhaust shaft of height <i>H</i> = 0.52–2.24 <i>m</i> with an adjustable flow area <i>f</i><sub><i>h</i></sub> = 0.0087–0.1185 m<sup>2</sup> have been presented. The bundle was made of six tubes with a finned-surface factor φ = 21.0 and intertube pitch <i>S</i><sub>1</sub> = 64 mm. From the measurement data, the average reduced coefficients of heat transfer of the bundle have been calculated; they were values of 1.26 to 5.84 W/(m<sup>2</sup>·°C) at the Reynolds numbers of (20–163)∙10<sup>3</sup>.</p><p>It has been found that pollution may lead to a substantial reduction in the transfer (up to 41%). The optimum area of the outlet hole of the exhaust shaft increases as the exhaust-shaft height grows, but decreases with pollution of the bundle.</p>

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Experimental Study of the Influence of Fouling on the Heat Transfer of a Single-Row Heat-Exchange Bundle of Round-Finned Tubes Under the Conditions of Enhanced Free Convection

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • G. S. Marshalova,
  • A. B. Sukhotskii,
  • D. V. Ostrovskaya,
  • E. S. Danil’chik

摘要

Experimental studies and generalization of the data on heat transfer of a single-row bundle of bimetal tubes with spiral knurled aluminum fins and uniform annular interfin pollution in the regime of free convection to vertical air flows created by an exhaust shaft of height H = 0.52–2.24 m with an adjustable flow area fh = 0.0087–0.1185 m2 have been presented. The bundle was made of six tubes with a finned-surface factor φ = 21.0 and intertube pitch S1 = 64 mm. From the measurement data, the average reduced coefficients of heat transfer of the bundle have been calculated; they were values of 1.26 to 5.84 W/(m2·°C) at the Reynolds numbers of (20–163)∙103.

It has been found that pollution may lead to a substantial reduction in the transfer (up to 41%). The optimum area of the outlet hole of the exhaust shaft increases as the exhaust-shaft height grows, but decreases with pollution of the bundle.