Results of experimental studies into free-convective heat transfer from single-row bundles of bimetallic tubes having spiral extruded aluminum fins of varying heights (2.0–14.6 mm) to vertical airflows created by an exhaust shaft having an adjustable airflow section are presented. The bundles (comprising six tubes) were arranged at a constant relative transverse pitch of σ1 = 1.14. In order to intensify free-convective heat transfer in air, a thermally insulated exhaust shaft having a height of 0.52 m was installed above the bundles. The performed measurements yield an average reduced heat transfer coefficient of 0.78 to 17.3 W/(m2 ·°C) at Rayleigh numbers of (19–360)·103. A similarity equation is provided for free-convective heat transfer from single-row bundles having fins of different heights relative to the narrowing coefficient of the exhaust shaft outlet area. It is shown that the thermal efficiency of single-row bundles can increased by a factor of >4 by increasing the tube fin height. However, in this case, a more significant increase in the finned surface factor is observed; moreover, with a larger airflow section of the exhaust shaft, the fin height corresponding to the most effective bundle in terms of volumetric heat flux density increases from 2 to 8 mm. Therefore, the installation of an exhaust shaft having an optimal airflow section above a single-row bundle can improve the heat transfer by 1.73–3.64 times.
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Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, Vol. 58, No. 4, pp. 31–35, April, 2022.
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Danilchik, E.S., Sukhotski, А.B. & Karlovich, T.B. Influence of an Exhaust Shaft Airflow Section on Single-Row Bundle Air Cooling Comprising Tubes with Spiral Fins of Different Heights. Chem Petrol Eng 58, 315–322 (2022). https://doi.org/10.1007/s10556-022-01093-1
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DOI: https://doi.org/10.1007/s10556-022-01093-1