| Title |
Numerical Study for the Effect of Inlet Air Velocity Magnitudes on the Upward and Downward Two-Phase Flow Pattern inside the Vertical U-shape Curved Pipe |
| DOI |
https://doi.org/10.6110/KJACR.2019.31.9.433 |
| Keywords |
기포 유동; 전산유체역학; 곡관; 오일러리안 다상유동; 기체 축적; 가동중시험 Bubbly flow; Computational fluid dynamics; Curved pipe; Eulerian multiphase flow; Gas Accumulation; In-service test |
| Abstract |
Gas-liquid two-phase flows through the vertically curved circular pipes can easily be found in various components of nuclear power plant such as pipes, shell-and-tube heat exchangers etc. Generally, the vertically curved circular pipes involve the combined effects of gravitational, centrifugal and buoyant forces, which tend to produce complications such as inhomogeneous phase distribution, flow reversal and secondary flow. These effects can lead to water hammer, subsequent pipe and components failure, and consequently the hydrodynamic behavior of a two-phase mixture flowing through the vertically curved circular pipe is significantly important. In this study, the upward and downward gas-liquid two-phase bubbly flow inside the vertical U-shape curved pipe was predicted using the Eulerian multiphase flow model in ANSYS CFX R17.2. The predicted results were compared to the experimental data in order to examine the applicability of this multiphase flow model. Furthermore, the effect of inlet air velocity magnitudes on the upward and downward two-phase flow pattern inside the vertical U-shape curved pipe was examined. |