Hydrodynamic structure of a two-phase bubble flow in a horizontal channel

The results of an experimental research on the hydrodynamic structure of a two-phase bubble gas-liquid flow in a horizontal channel are presented. Measurements were carried out in a range of superficial liquid velocities 0.4-1 m/sec and consumption volumetric gas content up to 0.2. The hydrodynamic structure was measured by means of the electrochemical method using miniature sensors of friction and velocity. Complete records of realizations of wall friction signals, gas content, and liquid velocity at different points of the channel cross section were made during the experiments. As a result of digital processing of the recorded realizations, profiles of local gas content, liquid velocity, and relative root-mean-square fluctuations of velocity have been obtained. Values of tangential stresses on the upper and lower channel walls have been determined. They were compared with the measured pressure difference along the length of the working section. A substantial difference of the hydrodynamic flow structure in the upper and lower halves of the channel is shown.