Home – Home – Jornals – Thermophysics and Aeromechanics 2004 number 4

Results of experimental studies of local characteristics of bubbly downflow in a vertical pipe are presented. Measurements were carried out at reduced liquid velocities from 0.3 to 1 m/s and low volumetric void fractions (from 0.01 to 0.03). The local parameters of the flow were measured using the electrochemical method. Experimental results prove significant deformation of the two-phase flow structure in comparison with a one-phase flow even at low gas flow rate ratios. The effect of the gas phase on flow characteristics looses its intensity with a decrease in liquid velocity. It is shown that at a rise of the gas flow rate ratio in the two-phase flow, turbulent pulsation of liquid velocity in the near-wall region decreases.