(554d) Simulating Gas-Liquid Flow in Aerated Stirred Bioreactors Based on Cfd-Pbm Model Conference: AIChE Annual MeetingYear: 2006Proceeding: 2006 AIChE Annual MeetingGroup: North American Mixing ForumSession: Multiphase Mixing I: Gas-Liquid Mixing Time: Thursday, November 16, 2006 - 1:36pm-1:57pm Authors: Sun, H., Genentech Inc. Kiss, R., Genentech, Inc. Computational fluid dynamics (CFD) is becoming a powerful tool in the scale-up and design of aerated agitated bioreactors. However, most early studies consider only single-phase flow or multiphase with a constant bubble size assumption. By solving the custom-integrated population balance model (PBM), which takes into account bubble break-up and coalescense, and the multiphase flow equations in a commercial CFD code (Fluent 6) simultaneously, local gas fraction, bubble-size distribution and volumetric mass transfer rate are predicted. Model predictions for the velocity field in a 100L bioreactor is compared with LDV measurements. The model provides a reliable tool in the scale-up and design of bioreactors, where the gas transfer rate is important.