Kinematic structure of established phase-separated gas/liquid internal flow with a wavy interface

The dynamic interactions of fluids and channel walls in a separated air/water flow are investigated experimentally, with an emphasis on the role of the secondary convective transport associated with the presence of waves at the interface. Measurements were performed 9 m from the entrance of a 0.1 x 0.2 x 12-m channel by hot-film anemometry (in air), laser Doppler anemometry (in water), and capacitive-wire probes (to determine the mean interface height and the standard deviation of the fluctuations). The results are presented graphically and discussed. A cellular structure is identified in both phases, and the secondary flows are found to have a significant effect on the distribution of the Reynolds stresses and the turbulent shear stresses at the wall and interface.