Study of the interfacial forces and turbulence models in a bubble column

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• 作者：Marcela Kotsuka Silva ; Marcos Akira d¡¯¨¢vila ; Milton Mori
• 关键词：Bubble columns ; CFD ; Interfacial forces
• 刊名：Computers and Chemical Engineering
• 出版年：2012
• 出版时间：14 September, 2012
• 年：2012
• 卷：44
• 期：Complete
• 页码：34-44
• 全文大小：1201 K

文摘

Three-dimensional Eulerian simulations of gas-liquid flows in a cylindrical bubble column were performed in order to evaluate the flow pattern in the heterogeneous flow regime. Simulations were conducted numerically by the finite element method using a commercial CFX code (v.12.0) and an analysis of interfacial forces such as drag, lift and turbulent dispersion, as well as a comparison of k-? and Reynolds Stress (RSM) turbulence models were performed. Different bubble sizes and two boundary conditions for the column exit were also verified. Gas velocities and holdup profiles were compared with experimental data. Results have shown that at the sparger region and without any simplification on the boundary condition the RSM model better represents the flow. At the fully developed region k-? also showed good results.