Hello Surya,nthank you for your answer. nThe eulerian model is something I considered, but it doesn't work for my case where high mass rates are involved.nSo, do you confirm that DPM applied on gas bubbles is not enabled to model mass transfer? Is an UDF the only way I have to do it?nAnother problem I'm facing is that I need to use ideal gas law for gas in bubbles, but I don't know how to select this property for particles material. I guess I need another UDF...nBest regards,nLorenzon