Mechanism of Falling Water Limitation under Counter-current Flow through a Vertical Flow Path

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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 J_l* at the same dimensionless superficial gas velocity j_g*. For the long flow path, a larger L/D conversely gives a smaller j_l* at the same j_g* though the effect of D itself is rather small.
一般社団法人日本機械学会の論文