Plasma Discharge in Liquids: Understanding the Initiation and Formation Mechanisms of Non-Thermal Plasma in Dense Medium

液体中的等离子体放电：了解致密介质中非热等离子体的引发和形成机制

• 批准号: 1707282
• 负责人: Tanvir Farouk
• 金额: $ 36.7万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-15 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1707282&HistoricalAwards=false
• 关键词: Plasma; Discharge; Liquids; Understanding; Initiation

The focus of the project is to determine how a plasma - a mix of free interacting charged and neutral particles - is formed in liquid media such as water or oil. Plasmas in liquids is one of the most exciting, challenging and important intellectual frontiers in modern plasma science. This project is aimed towards filling in the gap in the present understanding and mathematical modeling of plasma discharges in liquids. A study of the fundamental mechanisms of complex and inter-related processes by which a plasma discharge initiates, interacts and sustains in the liquid medium will also have substantial benefits outside the field of plasma science. Unique and critical technologies envisioned to have the greatest impact are biomedical - wound healing and sterilization, electronics - nano-particle synthesis, and energy efficiency - high-efficiency combustion from liquid fuel reforming.This project will computationally investigate plasma discharges in liquids using advanced numerical methods in conjunction with high-performance computing resources. The primary hypothesis of the research is that formation of a low-density medium (gas phase) through complex electric field-plasma-liquid interactions is the key initiation process for plasma discharges in a dense (liquid) medium. A multi-dimensional, multi-physics model will be developed and employed to determine the role and importance of low-density region/bubble for plasma discharge in non-polar and polar liquids, production and spatiotemporal evolution of reactive species in a multi-phase medium, and phase change due to coupled ponderomotive forces and ohmic heating effects. The main outcomes of this effort are expected to be a major leap in the predictive modeling capability for non-thermal plasma discharges in liquid/dense medium, new course material on multi-physics modeling to increase the education impact for engineering students, "YouTube"-based introductory short modules on plasma science, and outreach activities to inspire under-represented students and the general public towards STEM.

该项目的重点是确定等离子体（自由相互作用的带电粒子和中性粒子的混合物）如何在水或油等液体介质中形成。 液体中的等离子体是现代等离子体科学中最令人兴奋、最具挑战性和最重要的前沿知识之一。 本项目旨在填补目前对液体中等离子体放电的理解和数学建模中的差距。对等离子体放电在液体介质中启动、相互作用和维持的复杂和相互关联的过程的基本机制的研究也将在等离子体科学领域之外具有实质性的益处。预计将产生最大影响的独特和关键技术是生物医学-伤口愈合和灭菌，电子学-纳米颗粒合成，以及能源效率-液体燃料重整的高效燃烧。该项目将使用先进的数值方法结合高性能计算资源来计算研究液体中的等离子体放电。该研究的主要假设是，通过复杂的电场-等离子体-液体相互作用形成低密度介质（气相）是致密（液体）介质中等离子体放电的关键引发过程。一个多维的，多物理模型将被开发和使用，以确定低密度区域/气泡的作用和重要性，在非极性和极性液体中的等离子体放电，生产和时空演变的反应物种在多相介质中，和相变由于耦合有质动力和欧姆加热效应。 预计这一努力的主要成果将是液体/稠密介质中非热等离子体放电预测建模能力的重大飞跃，关于多物理建模的新课程材料，以增加对工程专业学生的教育影响，基于“YouTube”的等离子体科学介绍性短模块，以及鼓励代表性不足的学生和公众对STEM的推广活动。

项目成果

Striations in moderate pressure dc driven nitrogen glow discharge

• DOI: 10.1088/1361-6463/ac33da
• 发表时间: 2021-10
• 期刊: Journal of Physics D: Applied Physics
• 作者: M. Tahiyat;J. Stephens;V. Kolobov;T. Farouk

The role of negative hydroxyl ions in the electron generation and breakdown during plasma formation in liquid water

液态水中等离子体形成过程中负羟基离子在电子产生和击穿中的作用

• DOI: 10.1088/1361-6595/abfbc7
• 发表时间: 2021
• 期刊: Plasma sources science technology
• 作者: Aghdam, Ali Charchi;Farouk, Tanvir
• 通讯作者: Farouk, Tanvir

Multiphysics simulation of the initial stage of plasma discharge formation in liquids

液体中等离子体放电形成初始阶段的多物理场模拟

• DOI: 10.1088/1361-6595/ab51e3
• 发表时间: 2020
• 期刊: Plasma Sources Science and Technology
• 影响因子: 3.8
• 作者: Aghdam, Ali Charchi;Farouk, Tanvir
• 通讯作者: Farouk, Tanvir