G051054 傾斜板上での液膜流の破断に関する数値解析と実験([G051-05]流体工学部門,一般セッション : 液膜・液滴)

抄録

Gas-liquid interfacial flows, such as liquid film flows (also known as wetting flows on walls), are encountered in many industrial processes including absorption, distillation and so on. The present study focuses on detailed descriptions of the transition phenomena between the film flow and the rivulet flow, as well as how such phenomena are affected by wall surface texture treatments. This study develops a numerical simulation technique using Computational Fluid Dynamics (CFD) with the Volume of Fluid (VOF) model as well as a lab-scale experimental testing technique. Through the comparison of two geometry cases (smooth wall and wavy wall), the numerical and experimental results show quantitatively that surface texture treatments can help to prevent the liquid channeling and can increase the wetted area. The main reason for increasing the wetted area on the wavy wall is that the liquid film break-up is inhibited due to the liquid holding and the spreading of the liquid flow in spanwise direction by the wavy surface geometry.