I have added the gas exchange between the bubble and emulsion phases to the ODE version of the model. This exchange doesn't change the results greatly, but the slight differences may be meaningful for optimization of a reactor.
The summary for a case with no exchange is shown below.
Next, the results for a case with 20% exchange of the bubble phase gas.
What does CFD show regarding gas exchange?
Returning to the CFD simulation by CPFD Software , about 2/3 way through the video, I see that the O2 concentration plot indicates that the jet composition is different from the emulsion composition. This indicates that complete mixing between the bubble/jet and the emulsion phases doesn't occur. As the gas in the jet rises, the O2 concentration decreases. It is not possible to determine whether this is due to exchange or reaction in the jet.
What does CFD show regarding heat exchange?
The simulation also indicates that the assumption that bubble phase and emulsion phase have a uniform temperature is an appropriate approximation.
Heat transfer occurs by conduction (small), mixing of fluids, and by radiation. Mixing should produce similar results for mass and temperature. Therefore, I presume that radiation is the reason that the two phases have nearly uniform temperature but not uniform composition.