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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Modelling of a post-discharge reactor used for plasma sterilization
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Modelling of a post-discharge reactor used for plasma sterilization

机译：用于等离子体灭菌的放电后反应器的建模

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A three-dimensional hydrodynamic model is developed to simulate a post-discharge reactor placed downstream from a flowing microwave discharge in N-2-O-2 used for plasma sterilization. The temperature distribution and the density distributions of NO(B (2)Pi) molecules and O(P-3) atoms, which are known to play a central role in the sterilization process, are obtained in the reactor in the case of discharges at 915 and 2450 MHz, pressure range 1-8 Torr and N-2-xO(2) mixture composition, with x = 0.2-2%. Excluding the flow direction, sufficiently low temperatures ideal for sterilization have been found in most parts of the reactor. The highest NO(B) and O(P-3) concentrations at the reactor entrance are achieved at the highest pressure values investigated here. However, these larger densities rapidly decrease within a few centimetres below the values obtained at lower pressure. On the contrary, at low pressure the density distributions of NO(B) and O(P-3) are quasi-homogeneous in most of the horizontal planes. At 8 Torr the densities increase orders of magnitude in the reactor as the gas flow increases from 1 x 10(3) to 4 x 10(3) sccm, while at 2 Torr this increase does not reach even one order of magnitude. In agreement with the experiment, the densities of NO( B) and O(P-3) have been found to increase at 2 Torr as the O-2 percentage increases in the discharge gas mixture, whereas at 8 Torr the density of NO(B) decreases with O-2 percentage and the O(P-3) density presents only minor changes.
机译：建立了三维流体动力学模型，以模拟后放电反应器放置在用于等离子体灭菌的N-2-O-2中流动的微波放电下游。已知在灭菌过程中起着重要作用的NO（B（2）Pi）分子和O（P-3）原子的温度分布和密度分布是在反应器中以25 915和2450 MHz，压力范围1-8 Torr和N-2-xO（2）的混合物，x = 0.2-2％。除流动方向外，在反应器的大多数部位都发现了足够低的温度，非常适合灭菌。在此处研究的最高压力值下，反应器入口处的最高NO（B）和O（P-3）浓度达到最高。但是，这些较大的密度在比低压下获得的值低几厘米的范围内迅速降低。相反，在低压下，NO（B）和O（P-3）的密度分布在大多数水平面中是准均匀的。在8 Torr下，随着气流从1 x 10（3）sccm增加到4 x 10（3）sccm，密度在反应器中增加了数量级，而在2 Torr时，这种增加甚至没有达到一个数量级。与实验一致的是，随着排气混合物中O-2的百分比增加，NO（B）和O（P-3）的密度在2 Torr时增加，而在8 Torr时，NO（B）和O（P-3）的密度增加。 B）随着O-2百分比的降低而降低，而O（P-3）密度仅呈现较小的变化。

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