文献类型：期刊文献

英文题名：Hydrodynamics and mechanical forces of turbulent falling films over a hemispherical wall protrusion

作者：Liu, Qian[1];Liu, Jinbo[2];Zeng, Jie[1];Feng, Dawei[1];Wang, Yifei[1];Yu, Guangsuo[1];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Coal Liquefact Gasificat & Utilizat, Shanghai 200237, Peoples R China;[2]Shandong Yankuang Guotuo Technol Engn Co Ltd, Jinan 250101, Peoples R China

年份：2026

卷号：202

外文期刊名：INTERNATIONAL JOURNAL OF MULTIPHASE FLOW

收录：;EI(收录号：20262821100249);Scopus(收录号：2-s2.0-105044423435);WOS:【SCI-EXPANDED(收录号:WOS:001824659600001)】；

语种：英文

外文关键词：Turbulent falling film; Hemispherical ash slag; Numerical simulation; Flow visualization; Mechanical characteristics

摘要：The influences of a hemispherical ash simulant with a radius of 6 mm on the flow behaviors of vertical turbulent falling film (Reynolds number Ref approximate to 8.75 & times; 103 to 2.63 & times; 104) were investigated via high-speed photography and computational fluid dynamics (CFD) simulations. Based on distinct flow features, the entire liquid film flow field was classified into four zones. Water ridges and cavities were clearly captured within the primary characteristic zone, and the propagation as well as two distinct evolution modes of waves along the water ridges were summarized. Transverse oscillations developed at the tail of the water ridges, which contributed to the formation of interference fringes in adjacent regions. Numerical simulation results revealed that the fluid beneath the hemisphere exerted a squeezing effect on the inner side of the cavities. Analysis of the hemisphere's mechanical characteristics demonstrated that a larger lift force was the dominant factor promoting detachment of the hemispherical simulant from the wall. Additionally, drag and lift crisis phenomena occurred on the hemispherical obstacle as the film Reynolds number increased.