Numerical investigation of the spatiotemporal distribution of chemical species in an atmospheric surface barrier-discharge
Numerical investigation of the spatiotemporal distribution of chemical species in an atmospheric surface barrier-discharge
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DOI：
10.1063/1.4952574
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发表时间：
2016-05-28
影响因子：
3.2
通讯作者：
Walsh, J. L.
中科院分区：
文献类型：
--
作者：
Hasan, M. I.;Walsh, J. L.
采用一维含时对流-反应-扩散模型，研究了大气压空气表面阻挡放电下游传播的组分的时空分布。据发现，与正离子物质相比，带负电荷物质的分布在空间上更分散，这归因于冷却并附着到背景气体分子的电子的扩散，从而在放电区域下游产生不同的负离子。考虑到这种放电在涉及表面和液体的远程微生物净化的应用中的广泛使用，通过实施通过放电区域的机械对流来研究等离子体产生的反应性物质远离放电区域的运输。结果表明，对流的增加导致物种密度的空间分布变得均匀。人们还发现，许多物种有一个较低的密度接近放电的表面，因为对流防止他们的积累。而对于某些物质，如NO2，对流会导致密度普遍增加，这是由于靠近放电区域的停留时间减少，在放电区域，NO2通过与OH反应而迅速损失。还研究了施加功率的影响，并且发现大多数物种的密度，无论是带电的还是中性的，都与施加的功率成正比。出版社：AIP Publishing
Using a one dimensional time dependent convection-reaction-diffusion model, the temporal and spatial distributions of species propagating downstream of an atmospheric pressure air surface barrier discharge was studied. It was found that the distribution of negatively charged species is more spatially spread compared to positive ions species, which is attributed to the diffusion of electrons that cool down and attach to background gas molecules, creating different negative ions downstream of the discharge region. Given the widespread use of such discharges in applications involving the remote microbial decontamination of surfaces and liquids, the transport of plasma generated reactive species away from the discharge region was studied by implementing mechanical convection through the discharge region. It was shown that increased convection causes the spatial distribution of species density to become uniform. It was also found that many species have a lower density close to the surface of the discharge as convection prevents their accumulation. While for some species, such as NO2, convection causes a general increase in the density due to a reduced residence time close to the discharge region, where it is rapidly lost through reactions with OH. The impact of the applied power was also investigated, and it was found that the densities of most species, whether charged or neutral, are directly proportional to the applied power. Published by AIP Publishing.