In the bubble column reactor, gas phase is dispersed into the reactive liquid solution. then, the gas is dissolved in the liquid and react with a specie in the liquid phase. bubbles in the column decreases in size because of mass transfer of gas into the liquid.
In the CFX which model should be used for gas phase? (dispersed fluid model or particle transport fluid model)
can anyone explain the required specification for this system?
Thank you
Not only the mass transport resistance determined by the size of the bubbles and the turbulence of the continuous phase will be important, but also the rate of the chemical reaction/s. Regards,
Your basic question is, whether to use an Euler-Euler modeling scheme of Lagrange particle tracking (LPTM) of bubbles?
The main issue with using LPTM for bubble columns is, that in its basic formulation the LPTM is not taking into account the volumetric extend of bubbles. It works with the abstraction of mass points for tracked bubbles. There are some tricks and approaches to overcome this underlying limitation, but people were not very successful with that in the past, because than the CFD simulation quickly becomes much more demanding than an Euler-Euler modeling approach, i.e. a very large number (in the order of many millions of bubbles) are required and computational time intensive iterative coupling between the tracked particles and the fluid motion.
Consequently most work on bubble columns was done in the past using Eulerian schemes. You will find the appropriate set of fluid-bubble interaction models by downloading and reading some of the many publications which are stored here at Research Gate under my own account. Publications by Eckhard Krepper and the research group at HZDR, Dresden-Rossendorf, Germany might be a very good reference as well. Publications include vast validation of all these bubbly flow models, so that with this very well tested set of models you should be on the safe side for your modeling and you will be able to concentrate to incorporate in addition the effects of chemical reactions.
- Badges
- Science topic