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放电的电磁流体动力学现象。采用常压热等离子体（APTP）和非热等离子体（APNTP）对酸性气体（NOx、SOx、HF、HCI等）、温室气体（PFC、HC、HxOy等）、有毒气体（NF3、挥发性有机物）进行气体污染控制。消耗臭氧层的气体（氟氯化碳、哈龙）等，以及最近用于能源工业的固体、液体和气体燃料重整。电液排放ED，即水或液体内部排放，利用其氧化和还原过程以及优异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及其在多相系统中的其他物理和化学细节过程的作用尚未得到很好的理解，因此应用这些APTP， APNTP和ED的工业过程的优化尚未很好地实现。本文提出的程序是对最近在多相系统的大气压热等离子体和非热等离子体中观察到的许多现象的扩展。基于先进的PIV成像技术，EMHD显示了在极低雷诺数下，EMHD在气液单相流动中产生的尾流、von Karman型涡、湍流等奇异现象。这些现象的物理机理，以及压降降低、泵效应、减阻、流型转变是本研究的重点。对于多相系统，EMHD的空洞和固体迁移、冲击波/压力波的产生和传播、空化、热致等将是需要研究的额外现象。

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.