AbstractTo increase the mass transfer rates in bubble columns, a micro-structured bubble column is proposed.
The bubbles are cut by wire meshes, increasing the interfacial area available for gas/liquid mass transfer. This study focuses on the interaction between a single bubble and the wire mesh.
A reproducibility study shows that the experimental results are reproducible. The results of direct numerical simulations with a combined volume of fluid-immersed boundary method are compared with the experimental results. The validation is successful for the region below the wire mesh. Numerical data after the mesh could not be obtained.
A parameter study is performed using experimental data. It is found that the bubble size, liquid composition, mesh dimensions and the relative position of the bubble and the mesh have a significant influence on the bubble cutting behavior. The hydrophobicity of the mesh is reported to have no significant effect.
The results of the parameter study are fitted by regression analysis to provide bubble cutting closures for Euler-Lagrange models. Preliminary relationships are given to predict the deceleration of the bubble below the mesh. The available data is insufficient to predict to volume of daughter bubbles after the mesh. With more experimental and numerical data, composing an accurate bubble cutting closure for discrete bubble simulations is possible in the near future.
|Date of Award||31 Aug 2016|
|Supervisor||J.A.M. (Hans) Kuipers (Supervisor 1), Niels G. Deen (Supervisor 2), A.C.C. (Catarina) Esteves (Supervisor 2), Maike W. Baltussen (Supervisor 2) & K. Thiruvalluvan Sujatha (Supervisor 2)|