Siberian Federal University

The results of numerical modeling of airflow and heat transfer in a horizontally oriented single-row bundle consisting of six finned heated tubes under thermogravitational conditions are pre- sented. The study is performed for the bundles with a compact tube arrangement and varying fin pitch. The cases without and with the rectangular exhaust shafts of different heights installed above the bundle have been investigated. For the most compact bundle configuration in the absence of a shaft in the con- sidered range of moderate values of the Grashof number (up to 5.5×105), a good agreement was obtained between the calculated integral Nusselt number at the tube surface and experimental data taken from the literature. The combination of the fin pitch (spatial arrangement on the tubes) and the shaft height determined in computations allowed to obtain the optimal bundle design with the highest intensity of heat removal