Abstract:

To simulate complex bubbly flows in large diameter vertical pipes, the average bubble number density (ABND）model based on the population balance approach is employed and incorporated into the three-dimensional two-fluid model.To account the interfacial momentum transfer, essential interfacial force models are implemented and coupled with the two-fluid model.Fully mechanistic kernels are also integrated in the ABND model to account the evolution of bubble size due to its coalescence and breakage processes.To assess the performance of the ABND model, numerical studies are carried out to simulate various flow conditions and validate against a high-quality TOPFLOW experiment database with a nominal diameter of 195.3 mm. In comparison to the measurements, predictions from the ABND model appear marginally superior to those using MUSIG model.In addition, close agreement between the predictions and measurements is also achieved for local radial distributions of void fraction, Sauter mean diameter, and gas velocity, which clearly demonstrates the applicability of the bubble number density transport equation for modelling bubbly flow in large diameter pipes.

Key words: FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">泡状流；大管道；群体平衡方法；气泡的聚并；气泡的破裂；侧升力

关键词: FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">泡状流；大管道；群体平衡方法；气泡的聚并；气泡的破裂；侧升力