Flow Patterns in Parallel Channels

Slug-ring flow is the flow in which the probability of B is larger than that of C and the time-averaged void fraction is less than 0.8. 

Two-phase flow in parallel pipes, fed from a common manifold, displays interesting phenomena, as two phases may split unevenly when entering the parallel piping. Ozawa et al. (1979, 1989) performed experimental smdies on two-phase flow systems in parallel pipes of 3.1 mm diameter. They simulated the flow in boiling channels by injection of air and water into the pipes. 

---