نيلوفر محمدي نهراني

Plasma-liquid interactions are the most challenging issue in all plasma interaction. Plasma activated water is the product of this interaction during which different active species with different applications (agriculture, medicine, etc.) are created in water. Understanding of such unknown interaction field and insufficient study about that, required continuous simulations and subsequent experimental trials. By using Finite element method (FEM) in COMSOL Multiphysics 6.0 software, Dielectric barrier discharge (DBD) and arc discharge in the Argon bubble inside water have been simulated and studied. Alongside, the experimental setup of about 142Kv discharge was established by employing Marx method of impulse voltage generator for arc discharge with pin-pin electrodes immersed in water. Generated reactive species eva‎luated by spectrophotometry method. Acidity and alkalinity of water after treating by plasma was metered with PH meter. Simulation of DBD demonstrate direct relation between applied voltage, frequency and bubble radius with electron density, while for dielectric thickness it was indirect. Spectrum of pin-pin experiment shows dissociation of water molecules. Electron density calculated from spectrum is the same as electron density in arc discharge simulation with the same initial values and conditions. PH metering of water after ten minutes of plasma discharge shows acid range. Our results shows that Finite element methods is a reliable simulating method in designing plasma systems for estimating quantities with the least errors.

آب فعال شده با پلاسما - برهمكنش پلاسما با مايعات - تخليه سد دي الكتريك - ژنراتور ماركس - شبيه سازي - قوس الكتريكي

plasma activated water , plasma and liquid interaction , Dielectric barrier discharge , Marx Generator , simulation , arc discharge

Niloofar Mohammadi

Dr. Bahreini