[jayorayo]

Hi,

I'm running a model of a bioreactor and have been using the Discrete method for tracking the bubble sizes and numbers within the vessel. There is a wide range of sizes (and therefore bins) so I want to switch to the QMOM which should be a more efficient calculation.

I was wondering how to calculate the initial moment values that are applied to the inlet of the model? I understand that the 0th moment is the total number of bubbles per m3 and 1st moment = total length/m3, 2nd = surface area/m3 etc but how are these calculate in the first place. Based on the literature around the subject the values of these moments are based on the form of the bubble (or particle) size distribution.

I've worked through the bioreactor tutorial from Ansys and they've supplied initial values for moments 0-5 at the boundary but don't give an indication as to where these originated. Any tips or insight would be much appreciated.

Thanks!!