抄録
The present study investigates the mechanism of falling water limitation under a counter-current flow through a vertical flow path with the experiment of an air/water two-phase flow. The effects of flow path diameter D and length L which are major parameters for the problem are investigated systematically in the experiment. A comparison of the experimental results and the theoretical results reveals that the mechanism is different between a short flow path and a long flow path. The boundary between the short and the long flow paths is located at about L/D=2. For the short flow path, a larger ratio of L/D gives a larger dimensionless superficial liquid velocity Jl* at the same dimensionless superficial gas velocity jg*. For the long flow path, a larger L/D conversely gives a smaller jl* at the same jg* though the effect of D itself is rather small.
