Experimental study on momentum of electrohydrodynamic flow induced by corona discharge in the pin to two cylinder config
- PDF / 1,344,206 Bytes
- 8 Pages / 595.22 x 842 pts (A4) Page_size
- 93 Downloads / 171 Views
DOI 10.1007/s12206-020-0820-1
Journal of Mechanical Science and Technology 34 (9) 2020 Original Article DOI 10.1007/s12206-020-0820-1 Keywords: · Electrohydrodynamic (EHD) · Corona discharge · Townsend relation · Flow control
Experimental study on momentum of electrohydrodynamic flow induced by corona discharge in the pin to two cylinder configuration Jae Won Lee, Dong Kee Sohn and Han Seo Ko
Correspondence to: Han Seo Ko [email protected]
Citation: Lee, J. W., Sohn, D. K., Ko, H. S. (2020). Experimental study on momentum of electrohydrodynamic flow induced by corona discharge in the pin to two cylinder configuration. Journal of Mechanical Science and Technology 34 (9) (2020) 3679~3686. http://doi.org/10.1007/s12206-020-0820-1
Received April 21st, 2020 Revised
June 16th, 2020
Accepted July 16th, 2020
School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea
Abstract
Electrohydrodynamic (EHD) flow is an extremely efficient method of using high voltage to generate gas momentum, this approach has various strong points due to the system not having any mechanical component. There has been a lot of research about the locations of discharge points in EHD. However, only one-dimensional shifting has been identified using empirical relations. The Townsend relation between current and voltage shows stable corona discharge into gas. Also, momentum of EHD flow has a linear relationship with the square root of the current an can be expressed by an empirical equation. In this study, two-dimensional shifting of the discahrge point was carried out to uncover the relationship between discharge point and flow, which tackes account of not onlu axial but also lateral distances while using a pin to two cylinder configuration. As a result, the characteristics of EHD flow can be modeled and expressed as a function of a distance parameter. Therefore, an empirical relation of momentum with the experimental variables was derived.
† Recommended by Editor Yang Na
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
When extremely high energy is applied to air through a surface with large curvature like in certain electrodes, excitation of electrons occurs in molecules. The volume where this phenomenon occurs is called the ‘ionization region’. After this region is created, the excited electrons are attracted to an anode due to the Coulomb force while the positive ions left after the loss of electrons are collected into a cathode. When ionized components move in space between the ionization region and the cathode, which is called a collector electrode, random successive collision between positive ions and electrically neutral molecules occur. These collisions can produce gas momentum that comes from an electrical source, this is called ‘electrohydrodynamic flow’ (EHD flow) or ‘Ionic wind’ [1-3]. EHD flow is applicable to various industrial processes. One of the most useful applications of EHD flow for enhancing heat transfer is cooling device
Data Loading...
