Electromagnetic hydrodynamics of atmospheric plasma and electrohydraulic discharge in a multi-phase system

本项目的目的是研究气、液、固多相系统中大气等离子体和电液压放电的电磁流体动力学现象。近年来，大气压热(APTP)和非热等离子体(APNTP)被用于酸性气体(NOx、SOx、HF、HCI等)、温室气体(PFC、HC、HxOy等)、有毒气体(NF3、挥发性有机化合物)、臭氧消耗气体(CFCs、哈龙)等的气体污染控制，以及最新的能源工业中的固体、液体和气态燃料重整。水或液体中的放电，利用其氧化还原过程和良好的活化能力用于饮用水和废水处理。然而，电磁流体动力学EMHD所起的作用以及它们在多相系统中的其他物理和化学细节过程还没有被很好地了解，因此应用这些APTP、APNTP和ED的工业过程的优化没有很好地实现。本文提出的方案是在多相系统中观察到的许多最近在常压热和非热等离子体中观察到的现象的扩展。基于先进的PIV成像，在极低的雷诺数下，EMHD在气液单相流中表现出令人惊讶的现象，如EMHD产生的尾迹、von Karman型涡流、在位湍流等。这些现象的物理机制，以及压降降低、泵送效应、减阻、流型转变是本研究的动力。对于多相系统，EMHD空穴和固体的迁移、冲击波/压力波的产生和传播、空化、热膨胀等将是另一种有待研究的现象。

The objective of the present project is to investigate electromagnetic-hydrodynamics phenomena of atmospheric plasmas and electrohydraulic discharge in gas, liquid and solid multi-phase systems.  Atmospheric pressure thermal (APTP) and non-thermal plasmas (APNTP) were used for gaseous pollution control of acid gases (NOx, SOx, HF, HCI, etc.), greenhouse gases (PFC, HC, HxOy, etc.), toxic gases (NF3, volatile organic compounds).  ozone-depleting gases (CFCs, halon), etc., and the most recently for solid, liquid and gaseous fuel reforming in energy industries.  Electrohydraulic discharge ED, i.e., discharge inside water or liquids, were used for drinking and waste water treatments using their oxidation and reduction processes as well as excellent in activation capability.  However, the role play by the electromagnetic hydrodynamics EMHD is not well understood as well as their the other physical and chemical detail processes in multi-phase systems, hence the optimization of the industrial processes applied these APTP, APNTP and ED are not well achieved.The program proposed here is an expansion of many recent phenomena observed in atmospheric pressure thermal and non-thermal plasmas in a multi-phase system.  Based on advanced PIV imaging, EMHD shows surprised phenomena in gas and liquid single phase flow such as EMHD generated wake, von Karman type voltex, on-set of turbulence etc. under the very low Reynolds number.  The physical mechanism of these phenomena, as well as pressure drop reduction, pumping effect, drag reduction, flow regime transition are the forces of the present study.  For a multi-phase system, EMHD void and solid migration, shockwave/pressure wave generation and propagation, cavitation, thermophresis etc. will be an additional phenomena to be investigated.