Enhanced water activation in gas–liquid two-phase flow using air plasma droplets

Author:

Xu Han1ORCID,Xu Hancheng1ORCID,Huang Yihong1,Wei Zipeng1ORCID,Zhang Hao2ORCID,Shao Mingxu1,Xie Kai1

Affiliation:

1. School of Aerospace Science and Technology, Xidian University 1 , Xi'an 710071, People's Republic of China

2. State Key Laboratory of Electrical Insulation and Power Equipment, Centre for Plasma Biomedicine, Xi'an Jiaotong University 2 , Xi'an 710049, People's Republic of China

Abstract

We report on our study of gas–liquid two-phase flow of air plasma and its associated dynamic behavior, droplet activity, and applications. The propagation of the air plasma jet within a Venturi configuration is significantly perturbed by the presence of water droplets due to the local modification of the electric field that results from polarization and charging of the droplets. This local modulation, in turn, decreases the discharge current pulses and the radiation intensity of optical emissions. With a change in inlet airflow dynamics from laminar to turbulent (5–10 L/min), the droplet diameter decreased exponentially under strong pressure from millimeter to several tens of micrometers, whereas the gas–droplet contact area increased substantially. The production of short-lived reactive aqueous species OH and O2− was enhanced at the gas–liquid interface of the biphasic plasma droplets, and the activities of different long-lived species (H2O2, NO3−, and O3) in the droplet were highly selective in droplet diameter and value of the Henry-law constants. This new plasma source architecture enables an in situ activation of water sprays by plasma jets at short time scales, providing a desirable and effective sterilization tool and wastewater treatment at a relatively low cost and ease of operation.

Funder

National Natural Science Foundation of China

science and technology projects of shaanxi province

science and technology projects of xi'an city

young talent fund of association for science and technology in shaanxi, china

Fundamental Research Funds for the Central Universities

Publisher

AIP Publishing

Subject

Condensed Matter Physics

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