Heat Transfer Simulation And Initial Exploration Of The Mechanism Of Ozone Generation Via Dielectric Barrier Discharge

Ozone is an allotrope of oxygen, it is a blue with special smell gas at room temperature. Ozone has a strong oxidizing but it does not cause the secondary pollution. It is very attractive with a prospect of application, but the ozone production is a high consumption of inefficient process. A lot of the energy consumed by ozone generation will be converted into heat which can lead the gas temperature rise, ozone will decompose at high temperature. Therefore, It is important to study the temperature field of the discharge space, This article adopts the numerical simulation method for pulsed dielectric barrier discharge ozone discharge chamber heat transfer simulation. And try to explore the reaction mechanism of dielectric barrier discharge simulation results are as follows:After oxygen flows into the discharge space, we can refine the gas temperature change rule. It is shown that temperature rise along horizontal, gas temperature slightly lower on average when flow reaches the exit, electrode transfer heat to the gas the due to reaction progresses, gas flow would connect to outdoor gas when reach the outlet. So the temperature would increase at first, then slightly reduce. the temperature gradually raised along the longitudinal, but it will increase significantly at the bottom of gas gap. With dielectric on one side of the electrode is not easy to heat dissipation, dielectric heat conduction performance is poor, leading to higher temperature. With heat sink increased heat dissipation area, electrode to aluminum heat sink, heat through the heat conduction transfer is beneficial to lower the temperature of the gas gap. Different oxygen intake speed with the average temperature of the gas gap exists certain relation, improve the velocity of the fluid can effectively improve the heat dissipation effect. By changing the thickness of the rubber, improve discharge width, lower the temperature of the discharge space, by adding the fan, the ozone generator outside air forced convection heat transfer, also can significantly reduce the temperature of the gas gap.Secondly, ozone concentration in the initial stages of discharge presents fast growth. After reaching the peak value, due to that heat released by chemical reactions in the discharge gap is difficult to discharge, the discharge chamber temperature, partly makes the generated ozone decomposition of ozone concentration began to decline. And when the ozone generation rate and decomposition rate balance, ozone concentration no longer changes to achieve the stable value. High pressure low oxygen concentration near the electrode and electrode is far lower than the oxygen concentration of discharge gap center, its peak in the center of the discharge gap, center on both sides of basic oxygen concentration distribution is symmetrical and decreases gradually with the increase of the distance, and near the electrodes to the minimum.