A Numerical Analysis of Two-Dimensional Gas-Liquid Two-Phase Flow with Obstacles

In the steam generator and the fuel sub-assembly, gas-liquid two-phase flows are strongly affected by flow obstacles such as fuel pin bundles and tube bundles in flow field. To analyze the multi-dimensional two-phase flows in such system, we developed a modified drift flux model, which takes account of the effect of the centrifugal force due to curvatures of streamlines. In the experimental study to verify the model, characteristics of two-phase flows were measured in rectangular water tank, into which a porous plate was inserted as a flow obstacle. The experimental analysis with the modified drift flux model was performed introducing a general pressure loss term into the momentum equation to represent the effect of flow resistance due to flow obstacles. The analytical results were in good agreement with the experiment, and indicated the model applicability to the two-phase flow affected by flow obstacles.