On a co-current stratified air water flow with wavy interface

Horizontal, co-current, stratified, air-mercury flow in a rectangular channel was studied experimentally. From the measurement of gas phase velocity profile, it is shown that, for wavy surface; the planes of maximum velocity shift progressively towards the smooth upper wall as the gas phase Reynolds number is increased, the interfacial region has the similar structure as the turbulent flow over a rough surface, and the upper wall region exhibits the characteristics of low Reynolds number turbulence. The analytical method for co-current stratified two phase flow using the eddy diffusivity model, considering a wave induced turbulence, was presented. (author)