On the Characteristics of Confluent Flow of Gas-Liquid Mixtures in Headers

概要

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Equations for calculating the flow rate ratio of each branch pipe fitted on a confluent header with a short pitch are derived taking the pressure variation of a two phase mixture in the header into acount. The dimensionless confluent flow factor introduced in those equations has a similar form to one for a single phase flow and characterizes the flow rate ratio of branch pipes.The pressure loss of the branch pipe where liquid is heated uniformly along the pipe length and flows out in a state of a two phase flow is affected by the quality of flow at the outlet of the branch pipe. The flow rate distribution in branch pipes is measured for air-water mixtures by the equipment arranged to give the above pressure loss characteristics in the branch pipe. From the experimental results, the confluent flow factor is evaluated and compared with one for a single phase flow. The flow rate distribution in branch pipes predicted from those equations is in fairly good agreement with the experimental results.
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