Recently, the team of Professor Wang Junfeng of our school cooperated with the team of Professor Dong Mingdong of the Interdisciplinary Nanoscience Center of Aarhus University in Denmark to publish the latest research results entitled "Occurrence of giant plasma bubble in liquid" in the journal "Matter" of Cell Publishing House, and was recommended by the editor as the cover paper of the journal. Prof. Junfeng Wang is the first author and corresponding author, Prof. Mingdong Dong is the co-corresponding author, and Postdoctoral Fellow Wei Zhang is the co-first author.
When a fluid is subjected to an electric field, its flow phenomenon has its own unique characteristics compared to conventional fluids due to the coupling between the charged particles and the fluid interface. This study is the first to report the cross-scale transition process of bubbles from microscopic to macroscopic in charged liquid-gas multiphase flow systems under the action of strong electric fields. This phenomenon originates from the interaction between charged particles and neutral particles, and the resulting plasma bubbles and the interface phenomenon between ionized gas and liquid have an important impact on the hydrodynamic properties and interface stability, breaking through the traditional multiphase flow system with gas-liquid-solid three-state mixture as the research object, and involving a wealth of frontier scientific problems and theoretical innovations in multiphase flow.
It is an important application of charged multiphase flow theory in the field of efficient energy conversion and utilization by controlling the droplets, bubble dispersion and transport characteristics through electric field, and strengthening the multiphase heat and mass transfer and reaction process. In this study, a liquid-gas (plasma) system was innovatively constructed and visualized measurements were carried out, and a new physical phenomenon of the formation of stable large bubbles in the liquid phase of low-temperature plasma was successfully observed, and the kinetic characteristics of low-temperature plasma bubbles in the liquid phase were reported for the first time. This study has improved the understanding of the traditional solid-liquid-gas multiphase flow research system, and constructed a new type of multiphase flow with the fourth type of substance, plasma-liquid, as the research object, which has great application value in energy efficient conversion.
This work is supported by the National Natural Science Key Foundation of China, the National Natural Science Youth Foundation of China, the European Union's "European Horizon" Research and Innovation Program, the Denmark Independent Research Council, the Jiangsu Science and Technology Program (Innovation Support Program International Science and Technology Cooperation) project, and the Jiangsu Provincial Excellent Postdoctoral Program.
Link to paper: https://doi.org/10.1016/j.matt.2024.04.032
