HEAT TRANSFER IN A SWIRLING FLOW WITH A PAIRED SPIRAL-VORTEX STRUCTURE IN AN ANNULAR CHANNEL
E.V. Pankratov
Northern (Arctic) Federal University, Arkhangelsk, Russia
Keywords: swirling flow, annular channel, spiral-vortex structure, secondary flow, heat transfer control
Abstract
The effect of secondary flows in the form of a paired spiral-vortex structure, formed by flow swirling in an annular channel, on heat transfer is investigated. Local and average heat transfer characteristics in an annular channel under swirling flow conditions are determined experimentally and numerically. The formation of the paired spiral-vortex structure and the resulting nonuniformity in the Nusselt number distribution are examined. The data obtained are compared with known calculated correlations. The largest difference between the numerical simulation results and the experimental data for the distribution of the average heat flux density in the annular channel does not exceed 16 %. Secondary flows are found to form a complex local heat transfer pattern that is not described by existing correlations for the average Nusselt number.
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