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Type: Artigo de evento
Title: Influence Of Break Up And Coalescence Models In A Bubbly Flow
Author: Silva M.K.
Dionisio R.P.
D'Avila M.A.
Mori M.
Abstract: Three-dimensional gas-liquid simulations in a cylindrical bubble reactor with an external loop were performed. The effects of average bubble size, bubble size distribution and gas inlet plate geometry were evaluated. The population balance models of Luo and Svendsen [6] and Prince and Blanch [9] were used in order to simulate the breakup and coalescence effects, respectively. The drag force was modeled using the Ishii-Zuber model, which takes into account bubble deformation effects. The k-epsilon turbulence model was applied only for the continuous phase and the dispersed one was considered laminar. Lift, Magnus and added mass forces were neglected. Simulations at different superficial gas velocities were performed using two different inlets: a uniform and a perforated plate entrance. Breakup and coalescence effects were studied only for the uniform gas inlet geometry and the particle size distribution was obtained using a probability density function. Results show that the approach used in this work provided physically consistent results with transient effects in the column. Good agreement of the time-averaged gas holdup with experimental data on gas holdup available in the literature was obtained. It was found that the simulation approach used in this work was able to capture the complex transient fluid dynamics in bubbly flows.
Citation: Aiche Annual Meeting, Conference Proceedings. , v. , n. , p. - , 2008.
Rights: fechado
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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