PaSR & Imperfekte Rührkesselreaktoren
As is the perfectly stirred reactor (PSR), so is the partially stirred reactor (PaSR) a model reactor. Whilst the PSR combines two idealizations, spatial homogeneity and strongest possible effect of turbulence on mixing, the PaSR allows the intensity of mixing to be controlled by the instantaneous strength of turbulence but still sticks, in the turbulent mean, to the assumption of spatial homogeneity.
Thus, the partially stirred reactor allows the effects of turbulence on mixing of chemical species and on heat conduction to be studied.
In Cosilab, so-called "Monte-Carlo" methods are used for the simulation of perfectly stirred reactors. A two-equation turbulence model is implemented as well as different, alternative mixing models.
As one example, shown in the following figure is the result of a PaSR computation by Cosilab, where -- in a phase-space representation -- the molefractions of various species are plotted against temperature.