Isopropanol concentration control in the ultrasonic nebulization process

The paper presents the application of the linearizing control technique for stabilization of the isopropanol concentration in the ultrasonic nebulization process. The isopropanol concentration has to be kept constant to make the nebulization process more efficient. This is achieved by manipulating the inlet flow rate of a fresh isopropanol-water mixture. Because the content of the vessel is not well-mixed, it was shown that by measuring only the isopropanol concentration at the bottom of the vessel, the control system performance could be improved by the optimal selection of controller parameters. Moreover, the simulation results have shown that the closed-loop system was stable and exhibited similar behavior, even if the nebulization rate was not know precisely.