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《Plasma Science and Technology》 2018年05期
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Introduction to investigations of the negative corona and EHD flow in gaseous two-phase fluids

Jerzy MIZERACZYK  Artur BERENDT  
【摘要】:Research interests have recently been directed towards electrical discharges in multi-phase environments.Natural electrical discharges,such as lightning and coronas,occur in the Earth's atmosphere,which is actually a mixture of gaseous phase(air) and suspended solid and liquid particulate matters(PMs).An example of an anthropogenic gaseous multi-phase environment is the flow of flue gas through electrostatic precipitators(ESPs),which are generally regarded as a mixture of a post-combustion gas with solid PM and microdroplets suspended in it.Electrical discharges in multi-phase environments,the knowledge of which is scarce,are becoming an attractive research subject,offering a wide variety of possible discharges and multi-phase environments to be studied.This paper is an introduction to electrical discharges in multi-phase environments.It is focused on DC negative coronas and accompanying electrohydrodynamic(EHD) flows in a gaseous two-phase fluid formed by air(a gaseous phase) and solid PM(a solid phase),run under laboratory conditions.The introduction is based on a review of the relevant literature.Two cases will be considered:the first case is of a gaseous two-phase fluid,initially motionless in a closed chamber before being subjected to a negative corona(with the needle-toplate electrode arrangement),which afterwards induces an EHD flow in the chamber,and the second,of a gaseous two-phase fluid flowing transversely with respect to the needle-to-plate electrode axis along a chamber with a corona discharge running between the electrodes.This review-based introductory paper should be of interest to theoretical researchers and modellers in the field of negative corona discharges in single-or two-phase fluids,and for engineers who work on designing EHD devices(such as ESPs,EHD pumps,and smoke detectors).
【作者单位】Department
【基金】:supported by the National Science Centre(Grant No.UMO-2013/09/B/ST8/02054)
【分类号】:O359

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