Study Of The Mathematical Model Of Precipitation Reaction In The Rotating Liquid Film Reactor

A rotating liquid film reactor is a precipitation reactor with a rotor-stator structure which consists of rotating conical cylinders and a cylindrical diversion area.It is an excellent equipment for the preparation of nanomaterials,having the advantage of a narrow reaction area and a higher shear force.The mathematical model of the precipitation reaction in a rotating liquid film reactor is established in this paper,the solution of Navier-Stokes equation,reaction convection equation and population balance equation is investigated.The effect of different parameters of reactor on the volume mean particle size and particle size distribution is studied.The paper first simulates the experimental model,based on comparing the numerical results with the experimental ones the reliability of the numerical simulation method is verified.Then the precipitation reactions in the reactor under different rotor speeds and different gap widths are studied by numerical simulation,the sensitivity of volume mean particle size to the rotor speeds and the gap widths is discussed by introducing the partial elasticity.Finally,the result comparison of the CVFR inlet and the pressure inlet conditions is carried out.The results show that the volume mean particle size decreases and the particle size distribution narrows down with increasing rotor speed for the gap widths from 0.3mm to 0.5mm.Under rotor speeds from 1000r/min to 5000r/min,the volume mean particle size decreases and the particle size distribution narrows down with increasing gap width.For the rotor speeds below 3000r/min the volume mean particle size varies sharply with the rotor speeds,while it varies slowly for the speeds exceeding 3000r/min.The partial elasticity of the volume mean particle size to the rotor speeds is larger than that to the gap widths.That is,the volume mean particle size is more sensitive to the rotor speeds than to the gap widths.Finally,by using the CVFR instead of the pressure as the inlet condition to perform the numerical simulation,it is found that the numerical results obtained by the CVFR inlet condition are closer to the experimental ones,which showed the superiority of CVFR.