2025-12-17 大阪大学
＜関連情報＞
- https://www.entrance.es.osaka-u.ac.jp/features-news/2680/
- https://dl.begellhouse.com/pt/journals/5af8c23d50e0a883,1cfd17eb41f0c0b5,76d587ab229db4d5.html
静止円筒容器内の圧力損失支配型ロータによる気液二相流のトルク最大化機構 MECHANISMS OF TORQUE MAXIMIZATION IN GAS−LIQUID TWO-PHASE FLOWS DRIVEN BY A PRESSURE-LOSS-DOMINANT ROTOR IN A STATIONARY CYLINDRICAL CONTAINER
Mayu Kawamura,Kazuyasu Sugiyama,Tomoaki Watamura
Multiphase Science and Technology Published: Nov 12 2025
DOI:10.1615/MultScienTechn.2025060620
RESUMO
This study investigates the mechanisms of torque maximization and the associated energy losses in gas−liquid two-phase flows driven by a pressure-loss-dominant rotor, employing both experiments and numerical simulations. The experiments measured the time-averaged torque under a range of rotational speeds and liquid filling rates. The results confirmed that local peaks in the time-averaged torque emerge depending on the interface height and the rotor speed, highlighting the sensitivity of torque behavior to flow conditions. Furthermore, detailed analyses were conducted using three-dimensional direct numerical simulations incorporating the volume-of-fluid (VOF) method, the multi-dimensional tangent of hyperbola interface capturing (MTHINC) method, and the boundary data immersion (BDI) method. These analyses revealed that, in addition to direct impacts between the rotor and the interface, significant pressure distribution changes develop near the rotor. In particular, high-pressure regions at the rotor front and low-pressure regions at its rear were observed. These pressure variations can substantially affect the torque characteristics. Moreover, it was suggested that these effects vary with the liquid filling rate and that changes in rotational speed also alter the relative contributions of these mechanisms. Overall, the results provide a deeper understanding of energy loss mechanisms in gas−liquid two-phase flow systems and are expected to offer valuable insights for their optimal design and operation, contributing to higher efficiency and performance in relevant engineering applications.
