Heat exchange of a mixture of gases with different Prandtl numbers under a swirl flow in a circular heated channel

The results of experimental studies of hydrodynamics and heat transfer in a swirl air flow (Pr = 0.7) and a helium-xenon mixture (Pr = 0.2) in heated circular channels with original screw inserts in a wide range of Reynolds numbers are presented. The efficiency analysis of heated channels with a swirl of the flow is compared with the efficiency analysis of the channels without swirling the flow using the energy necessary for pumping the gas through the heated channel. (paper)