I106 MODELING OF FLOW PATTERNS AND DYNAMIC CHARACTERISTICS OF REFLUX CONDENSATION PHENOMENA(Multiphase flow dynamics/non-linearity)

概要

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The condensation in reflux condenser with a tube of the large tube length-to-diameter (L/D) ratio could be carried over under fill-and-dump and annular co current mode of two-phase flow. The growth and sudden expel of the water column of condensate in the tube generate the pressure pulse which affects the thermal-hydraulic characteristics of the reflux condenser, i.e. the heat removal capacity and transition from the total reflux condensation to the co current natural circulation. An experimental test rig of large L/D ratio (230<L/D<450) was constructed to observe the flow patterns and dynamics of the reflux condensation. From the experimental observation made, a theoretical model based on the lumped parameter method is made to understand the dynamics of the reflux condenser. The present model in the magnitude and period of oscillation for the various diameters predicted experimental data of dynamics well. The present model could be used as a simple tool for the design study and the study related to the pressure pulse effect on the reflux condenser.
一般社団法人日本機械学会の論文
2000-10-01