Abstract
There is a very distinctly discontinuous region at the boundary between fish scale type slug flow and froth flow in a vertical small tube. This involves a possibility of leading to the relaxation oscillation of a stream, when the air line has an air chamber, and the inlet hole to the chamber has a fairly high degree of resistance. In the case of constant rate of liquid flow, the condition of generating the relaxation oscillation is as follows Cc<1/q%gt;<QgB1/q-QgA1/q/PVA-PVB where Cc:Qg3/(P4-PV)q=constant q: constant PV: pressure of air chamber Qg3 : rate of air flow which streams into air chamber Qg2: rate of air flow which streams into tube Subscripts A and B: Upper limit of fish scale type slug flow region and lower limit of froth flow in steady state
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