THE FEATURES OF HEAT EXCHANGE AND HYDRODYNAMICS WHEN AIR FLOWS AROUND BEAMS OF CYLINDERS
Abstract
The purpose of the work is to evaluate various methods for intensifying heat transfer when air flows around bundles of cylinders while possibly minimizing pressure losses.
The results of experimental and theoretical studies of transverse air flow around a homogeneous bundle of cylinders are presented. The patterns of changes in the characteristics of heat transfer and aerodynamic resistance of a given cylinder bank under the conditions under consideration are analyzed. Based on computer modeling, the role of vortex structures in intensifying the heat transfer process is assessed. Data are presented on the effect of spiral grooves on the surface of the cylinders on the heat transfer coefficient and pressure loss. It is shown that the cross-section of spiral grooves also has a significant impact on the analyzed characteristics, while the oval cross-section leads to a greater intensification of heat transfer compared to grooves with a rectangular cross-section. It is noted that the sharpness of the edges plays a significant role when air exits the groove onto the surface of the cylinder. The results of experimental studies on the role of separating plates (splitters) on the aft surface of the cylinders are considered. It is shown that the presence, length and number of plates have a significant impact on the aerodynamic drag of the cylinder bank.
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