Abstract
Considerer the influence of a change in the height of the height of the finning of bimetallic finned tubes of a single-row bundle on the thermal, overall and metal-capacity characteristics in the mode of free air convection at different angles of inclination (γ = 0, 15, 30, 45, 60 and 90°) to the horizontal plane. The investigated tubes have the following characteristics: the material of the supporting tube was carbon steel (outer diameter d out = 25 mm, wall thickness δ = 2 mm), the material of the rolling finned shell was aluminum alloy AD1M. Geometric parameters of the fins: d×d 0 ×h×s×Δ×φ× l = 56,0×26,8×14,6×2,5× 0,5×19,3×300 mm (type I). The studies were carried out by the method of complete thermal modeling on a specially designed experimental stand. Then the fins were ground by grinding with the formation of new types of tubes (II–VI), which were assembled into a single-row bundle with a constant relative transverse pitch σ 1 = S 1 / d = 1,14 = const. The article describes the criterion dependences for heat transfer of a finned single-row bundle of tubes with different finning heights at different angles of inclination to the horizontal plane, as well as a graphical dependenc e of the correction factor for the angle of inclination of bundle (γ = 0–90°) were obtained. It has been established that an increase in the angle of inclination and the height of the finning of tubes of a single -row bundle is generally accompanied by a decrease in heat transfer. In terms of overall and metal-capacity characteristics, the most effective is a single-row bundle at various angles of inclination to the horizontal plane with a tube finning height 2,0 mm.
Highlights
For citation: Danil’chik ЕS, Sukhotski AB, Kuntysh VB
Then the fins were ground by grinding with the formation of new types
which were assembled into a single-row bundle with a constant relative transverse pitch σ1
Summary
Резюме: Рассмотреть как будет влиять изменение высоты оребрения биметаллических оребренных труб однорядного пучка на тепловые, габаритные и металлоемкостные характеристики в режиме свободной конвекции воздуха при различных углах наклона (γ = 0, 15, 30, 45, 60 и 90°) к горизонтальной плоскости. В статье получены критериальные зависимости по теплоотдаче оребренного однорядного пучка из труб с различной высотой оребрения при разных углах наклона к горизонтальной плоскости, а также графическая зависимость поправочного коэффициента на угол наклона пучка (γ = 0–90°). Установлено, что увеличение угла наклона и высоты оребрения труб однорядного пучка в целом сопровождается снижением теплоотдачи. По габаритным и металлоемкостным характеристикам наиболее эффективным является однорядный пучок при различных углах наклона к горизонтальной плоскости с высотой оребрения трубы. Экспериментальные исследования эффективности однорядного пучка из биметаллических оребренных труб с различной высотой оребрения при свободно-конвективном теплообмене с воздухом // Известия высших учебных заведений.
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