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Important parameters in plasma jets for the production of RONS in liquids for plasma medicine: A brief review

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Frontiers of Chemical Science and Engineering 2019年第2期13卷 238-252页

作者： Anna Khlyustova Cédric Labay Zdenko Machala Maria-Pau Ginebra Cristina Canal Biomaterials Biomechanics and Tissue Engineering GroupDepartment of Materials Science and MetallurgyUniversitat Politecnica de CatalunyaBarcelona 08019Spain Research centre in Multiscale Science and Engineering Universitat Politecnica de CatalunyaBarcelona 08019Spain Faculty of Mathematics Physics and InformaticsComenius UniversityBratislava 84248Slovakia

Reactive oxygen and nitrogen species (RONS) are among the key factors in plasma medicine. They are generated by atmospheric plasmas in biological fluids, living tissues and in a variety of liquids. This ability of plasmas to create a delicate mix of RONS in liquids has been used to design remote or indirect treatments for oncological therapy by treating biological fluids by plasmas and putting them in contact with the tumour;Documented effects include selective cancer cell toxicity, even though the exact mechanisms involved are still under investigation. However, the "right" dose for suitable therapeutical activity is crucial and still under debate. The wide variety of plasma sources hampers comparisons. This review focuses on atmospheric pressure plasma jets as the most studied plasma devices in plasma medicine and compiles the conditions employed to generate RONS in relevant liquids and the concentration ranges obtained. The concentrations of H2O2, NO2^-, NO3^- and short-lived oxygen species are compared critically to provide a useful overview for the reader.

关键词： atmospheric plasma jets liquids ROS RNS plasma-dose

Analyzing of mixing performance determination factors for the structure of radial multiple jets-in-crossflow

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2626-2634页

作者： Meifang Zhou Hao Jiang Yanjie Hu Zhimin Lu Haibo Jiang Chunzhong Li Key Laboratory for Ultrafine Materials of the Ministry of Education School of Materials Science and EngineeringEast China University of Science&TechnologyShanghai 200237China School of Materials Science and Engineering Yancheng Institute of TechnologyYancheng 224051China

The radial multiple jets-in-crossflow mixing structure(RMJCMS) is extensively used in industrial manufacture. In this research, the effects of thickness of injection ring on mixing performance and factors influencing the mixing performance of RMJCMS were discussed based on the results of computational fluid dynamics. The simulation results showed that the dimensionless mixing distance, with the increase of the thickness of injection ring, drops from 1.1 to 0.18 first and then increases to 0.27 while the uniformity of flux monotonously improves, manifesting that the consistency of flux is not the single element determining the mixing performance. Analyzing the simulation results, a conclusion was drawn that the consistency of flux, penetration mode and interaction among injection flows which can be altered by adjusting the thickness of injection ring, determine the mixing performance of RMJCMS jointly. That is to say, in RMJCMS an injection ring with a suitable thickness can realize the function of injection and rectification simultaneously, which not only improves the mixing performance but also reduces the complexity of RMJCMS as well.

关键词： Thickness of injection ring Multiple jets mixing structure Computational fluid dynamics Penetration mode Jet interaction

jets,Accretion and Spin in Supermassive Black Holes

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Research in Astronomy and Astrophysics 2024年第11期24卷 112-118页

作者： Yongyun Chen Qiusheng Gu Jianghe Yang Junhui Fan Xiaoling Yu Dingrong Xiong Nan Ding Xiaotong Guo College of Physics and Electronic Engineering Qujing Normal UniversityQujing 655011China School of Astronomy and Space Science Nanjing UniversityNanjing 210093China Key Laboratory of Modern Astronomy and Astrophysics(Nanjing) Ministry of EducationNanjing 210093China College of Mathematics and Physics Science Hunan University of Arts and ScienceChangde 415000China Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Yunnan Observatories Chinese Academy of SciencesKunming 650011China School of Physical Science and Technology Kunming UniversityKunming 650214China Institute of Astronomy and Astrophysics Anqing Normal UniversityAnqing 246133China

The theoretical model suggests that relativistic jets of active galactic nuclei(AGNs)rely on the black hole spin and/or *** study the relationship between jet,accretion,and spin using supermassive black hole samples with reliable spin of black *** results are as follows:(1)There is a weak correlation between radio luminosity and the spin of the black hole for our sample,which may imply that the jet of the supermassive black hole in our sample depends on the other physical parameters besides black hole spins,such as accretion disk luminosity.(2)The jet power of a supermassive black hole can be explained by the hybrid model with magnetic field of corona.(3)There is a significant correlation between radio-loudness and black hole spin for our *** sources with high radio-loudness tend to have high black hole *** results provide observational evidence that the black hole spin may explain the bimodal phenomena of radio-loud and radio-quiet AGNs.

关键词： galaxies active-galaxies general-galaxies jets

Acoustic measurements of models of military style supersonic nozzle jets

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Chinese Journal of Aeronautics 2014年第1期27卷 23-33页

作者： Ching-Wen Kuo Jérémy Veltin Dennis K.McLaughlin Department of Aerospace Engineering The Pennsylvania State UniversityUniversity Park TNO Science and Industry

Modern military aircraft jet engines are designed with variable-geometry nozzles to provide optimal thrust in different operating conditions, depending on the flight envelope. How- ever, acoustic measurements for such nozzles are scarce, due to the cost involved in making full- scale measurements and the lack of details about the exact geometries of these nozzles. Thus the present effort at Pennsylvania State University （PSU） in partnership with GE Aviation and the NASA Glenn Research Center is aiming to study and characterize the acoustic field produced by supersonic jets issuing from converging-diverging military style nozzles, and to identify and test promising noise reduction techniques. An equally important objective is to develop methodology for using data obtained from small- and moderate-scale experiments to reliably predict the full-scale engine noise. The experimental results presented show reasonable agreement between small-scale and medium-scale jets, as well as between heated jets and heat-simulated ones.

关键词： Aeroacoustics Acoustic noise measurement Jet noise jets Nozzle Supersonic flow

Numerical investigation on flow field characteristics of dual synthetic cold/hot jets using POD and DMD methods

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Chinese Journal of Aeronautics 2020年第1期33卷 73-87页

作者： Qiang LIU Zhenbing LUO Xiong DENG Lin WANG Yan ZHOU College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China

In order to improve the control ability of synthetic jets in compressible boundary layer,a novel control method based on dual synthetic cold/hot jets coupled control of velocity profile and temperature profile was *** fundamental investigations on the effects of synthetic jet temperature on the jet behavior and flow field characteristics were essentially necessary,preliminary numerical simulations were conducted to study the influence of temperature(200 K and 400 K)on the flow field characteristics of synthetic jets using Large Eddy Simulations(LES)***-averaged flow fields showed that different temperatures led to variable behavior of two strands of *** dual synthetic cold jets,a potential-core arose apparently with its height ranging from 0.01 to 0.03 m,while for dual synthetic hot jets,two strands of jets emerged *** modal decomposition of instantaneous flow fields had been done using both Proper Orthogonal Decomposition(POD)and Dynamic Mode Decomposition(DMD).Various modes showed different characteristics of the flow *** the POD method focuses on the energy of flow while the DMD method focuses on the frequency,the first two modes had many similarities,but the third and fourth modes demonstrated completely different vortex *** current researches play a role of preliminary investigations for further and comprehensive exploration of novel flow control measures in global velocity field.

关键词： Dual synthetic cold/hot jets Dynamic mode decomposition Jet behaviors Proper orthogonal decomposition Synthetic jet Vortex structures

Characteristics of Plasma jets in Laser-Driven Magnetic Reconnection

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Plasma Science and Technology 2012年第2期14卷 97-101页

作者：刘勋李玉同仲佳勇董全力王首钧张蕾朱健强赵刚张杰 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of Sciences National Laboratory on High Power Lasers and Physics Key Laboratory for Laser Plasmas(Ministry of Education)and Department of Physics Shanghai Jiao Tong University

The jets driven by magnetic reconnection in laser-plasma interactions are investi- gated experimentally. The diagnostics in the optical and X-ray ranges provide detailed information about the jet characteristics. The plasma jets perpendicular to and along the target surface are observed clearly, which is evident signatures of laser driven magnetic reconnection. The jet formation is also investigated for different experimental parameters.

关键词： laboratory astrophysics jets magnetic reconnection laser-plasma

A new type of plunge pool―Multi-horizontal submerged jets

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Science China(Technological Sciences) 2008年第12期51卷 2128-2141页

作者： DENG Jun,XU WeiLin,ZHANG JianMing,QU JinXue & YANG YongQuan State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu 610065 China

Based on the understanding of the mechanism of energy dissipation,a new type of plunge pool is presented with the advantages of high rate of energy dissipation,low impact pressure,and small close-to-bed velocity on the soleplate of the plunge *** first advantage owes to enlarged shearing energy dissipation areas in the plunge pool,while the other two are caused by the jet that enters in a nearly horizontal level to keep the soleplate from being scoured *** of the above arrangements make this new type of energy dissipator distinct from the underflow energy *** experiments on the physical model,the authors found that the water flow maintained stable and submerged in horizontal direction when the flow was narrow in horizontal but thick in vertical ***,the wide flat nappe was ready to submerge or float as the downstream water level rised or *** entire flow fields of multi-horizontal submerged jets into plunge pool were also numerically *** numerical results of water surface curve,close-to-bed velocity and floor pressure agree well with the experimental *** flow pattern in the plunge pool was analyzed after combining the laboratory data and numerical simulation.

关键词： hydraulic engineering 3-D flow field numerical simulation plunge pool submerged jets

Predicting Gravitational Waves from Jittering-jets-driven Core Collapse Supernovae

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Research in Astronomy and Astrophysics 2023年第12期23卷 1-6页

作者： Noam Soker Department of Physics TechnionHaifa3200003Israel

I estimate the frequencies of gravitational waves from jittering jets that explode core collapse supernovae(CCSNe)to crudely be 5–30 Hz,and with strains that might allow detection of Galactic *** jittering jets explosion mechanism(JJEM)asserts that most CCSNe are exploded by jittering jets that the newly born neutron star(NS)launches within a few *** to the JJEM,instabilities in the accreted gas lead to the formation of intermittent accretion disks that launch the jittering *** studies that did not include jets calculated the gravitational frequencies that instabilities around the NS emit to have a peak in the crude frequency range of 100–*** on a recent study,I take the source of the gravitational waves of jittering jets to be the turbulent bubbles(cocoons)that the jets inflate as they interact with the outer layers of the core of the star at thousands of kilometers from the *** lower frequencies and larger strains than those of gravitational waves from instabilities in CCSNe allow future,and maybe present,detectors to identify the gravitational wave signals of jittering *** of gravitational waves from local CCSNe might distinguish between the neutrino-driven explosion mechanism and the JJEM.

关键词： gravitational waves-stars neutron-stars black holes-(stars )supernovae general-stars jets

PREDICTION OF CHARACTERISTICS FOR VERTICAL ROUND NEGATIVE BUOYANT jets IN HOMOGENEOUS AMBIENT

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Journal of Hydrodynamics 2001年第1期13卷 103-110页

作者： Huai, W.X. Li, W. Dep. of River Eng. Coll. of Water Resource Eng. Wuhan 430072 China

The k-Ε turbulence model is used to establish a mathematical model of a vertical round jet with negative buoyancy in a static homogeneous ambient. The hybrid finite analytic method, with a non-uniform staggered grid, is used to calculate the whole flow field. The variations of centerline velocity, density and turbulent kinetic energy along the axial line for a given exit densimetric Froude number are found to converge to single curves under the unified scaling law derived by Chen and Rodi. The profiles of mean velocities, mean density difference and the half-width of negative buoyant jets for velocity and density are given. The calculation confirmed that the maximum height of rise is proportional to M03/4 B0-1/2, where M0 and B0 are the momentum flux and the buoyancy flux at the source, respectively.

关键词： Computer simulation jets Mathematical models Numerical methods