Vortex structure of a flow in a heat exchanger with twisted tubes

Experimental study on the intensity of longitudinal rate pulsations, autocorrelation function, spectral density and turbulence macroquantities in twisted tube beams with relative twisting pitches S/d=12.5 and 25 is carried out, therewith analogue thermoanemometric equipment, computers and digital signal analyser with tape interrecording, that allows an accurate X-ray analysis, was used. It is noticed that in the flow core an appreciable anisotropy of properties is detected that is due to presence of open channels and places of the tube contact. With high Reynolds numbers turbulent structure in this flow region yields to isotropic that may be used in designing heat mass transfer calculations in such beams