Fluid Dynamics最新文献_第7页

Double-Pipe Heat Exchanger with Diffuser Channels with Gas and Liquid Coolants 带有气体和液体冷却剂扩散通道的双管热交换器

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2025-07-20 DOI: 10.1134/S0015462825601032

V. G. Lushchik, A. I. Reshmin, K. S. Egorov

引用次数: 0

Generation of Oxygen Atoms during Laser Photolysis of O2 behind Reflected Shock Waves and the Kinetics of Their Interaction with Methane 反射激波后激光光解O2过程中氧原子的生成及其与甲烷相互作用动力学

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2025-07-20 DOI: 10.1134/S0015462825600968

N. S. Bystrov, A. V. Emelianov, A. V. Eremin, E. S. Kurbatova, P. I. Yatsenko

{"title":"Generation of Oxygen Atoms during Laser Photolysis of O2 behind Reflected Shock Waves and the Kinetics of Their Interaction with Methane","authors":"N. S. Bystrov, A. V. Emelianov, A. V. Eremin, E. S. Kurbatova, P. I. Yatsenko","doi":"10.1134/S0015462825600968","DOIUrl":"10.1134/S0015462825600968","url":null,"abstract":"In this paper, the first experimental results of measuring the time profiles of the atomic oxygen concentration by atomic resonance absorption spectroscopy (ARAS, 130.5 nm) obtained using the developed experimental complex combining shock-wave heating and pulsed laser photolysis (LP, 193 nm) of gas mixtures are presented. Using the example of photolysis of oxygen molecules and the reaction of O atoms with methane, the capabilities of the developed setup for studying the kinetics of elementary reactions are demonstrated. The temperature dependence of the absorption cross section of oxygen and methane molecules for a wavelength of 130.5 nm is obtained. The efficiency of oxygen atom formation during the laser photolysis of oxygen molecules is determined in the temperature range of 700–1900 K at laser pulse energies of 300–400 mJ. The rate constant of the reaction of oxygen atoms with methane at temperatures of 770–1600 K and pressures of 3–4 bar is obtained. Additionally, numerical modeling of experimental profiles is carried out using current kinetic schemes of hydrocarbon combustion.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 3","pages":""},"PeriodicalIF":0.6,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Turbulent Boundary Layer on a Plate in Compressible Gas Flow 可压缩气体流动中平板湍流边界层

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2025-06-17 DOI: 10.1134/S0015462825600439

V. G. Lushchik, A. I. Reshmin

引用次数: 0

Extended High-Current Arc Discharges in an External Magnetic Field in Gas Media 气体介质外磁场下的扩展大电流电弧放电

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2025-06-17 DOI: 10.1134/S0015462825600932

A. P. Glinov, A. P. Golovin, P. V. Kozlov

{"title":"Extended High-Current Arc Discharges in an External Magnetic Field in Gas Media","authors":"A. P. Glinov, A. P. Golovin, P. V. Kozlov","doi":"10.1134/S0015462825600932","DOIUrl":"10.1134/S0015462825600932","url":null,"abstract":"Extended (up to several tens of centimeters) high-current (hundreds of amperes) electric arcs in various gases at the atmospheric pressure are studied experimentally and theoretically. Such discharges have been studied on the electric discharge stand of the P-2000 facility of the Institute of Mechanics of Moscow State University. The data on the influence of an external magnetic field on the stability of such discharges and the formation of branched current channels are clarified. One of the areas of the research is the study of the effect of the orientation of the magnetic field imposed on the arc on the processes of development of the discharge in various gas media, such as air, CO2, Ar, and N2. The data for argon and nitrogen are presented most fully. The experiments were carried out in a chamber with transparent walls. The calculation and the theoretical study are carried out on the basis of an electrical engineering model using the empirical data on the volt-ampere characteristics of arcs between graphite electrodes. It is found that the stability of high-current arcs is significantly affected by electrode jet-flame dynamics. At the same time, the traditional models of arcs in the external magnetic field without taking these factors into account show that the direction of the external axial field does not affect the stability of the arcs, affecting only the direction of their twisting during the development of helical instability.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 3","pages":""},"PeriodicalIF":0.6,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Study on Polymer Non-Newtonian Droplet Impingement 聚合物非牛顿液滴撞击的数值研究

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2025-06-17 DOI: 10.1134/S0015462825600026

D. S. Li, C. Y. Feng, K. Wang, D. Zhang

{"title":"Numerical Study on Polymer Non-Newtonian Droplet Impingement","authors":"D. S. Li, C. Y. Feng, K. Wang, D. Zhang","doi":"10.1134/S0015462825600026","DOIUrl":"10.1134/S0015462825600026","url":null,"abstract":"The impact of droplets on surfaces is widely applied in inkjet printing and additive manufacturing. Industrial fluids often exhibit non-Newtonian properties (e.g., shear-thinning or viscoelasticity) due to additives. While existing studies focus on Newtonian fluids, this work investigates non-Newtonian droplet dynamics using a numerical model combining the volume of fluid (VOF) and level set methods to track phase interfaces. The effects of polymer concentration on the droplet impact behavior are analyzed. The results show that increase in the polymer concentration enhances viscous dissipation during impact, leading to significant morphological changes. Specifically, the higher concentrations reduce the maximum dimensionless spreading diameter, increase the maximum dimensionless height, delay the splashing onset, elevate secondary droplet positions, and amplify lateral deviation from the centerline. Upon impacting the high-temperature surfaces, the surface heat flux of polymer droplets initially increases and then decreases due to field synergy effects. These findings establish predictive correlations for controlling droplet deposition in oil–water separation applications, emphasizing the critical role of rheological tailoring in optimizing impact outcomes.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 3","pages":""},"PeriodicalIF":0.6,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vertical Momentum Transfer by Internal Waves with Regard for the Horizontal Component of Angular Velocity of the Earth’s Rotation 考虑地球自转角速度水平分量的内波的垂直动量传递

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2025-06-17 DOI: 10.1134/S0015462824604492

A. A. Slepyshev

{"title":"Vertical Momentum Transfer by Internal Waves with Regard for the Horizontal Component of Angular Velocity of the Earth’s Rotation","authors":"A. A. Slepyshev","doi":"10.1134/S0015462824604492","DOIUrl":"10.1134/S0015462824604492","url":null,"abstract":"Free internal waves in a uniformly stratified fluid are considered in the Boussinesq approximation with regard for the Earth’s rotation. It is shown that the dispersion relation, derived with taking into account the horizontal component of the angular velocity of the Earth’s rotation at constant wave frequency, is reduced to the canonical equation for second-order curves in the plane of horizontal wave numbers. If the wave frequency is higher than the inertial frequency and less than the Brunt-Väisälä frequency, the frequency isolines are ellipses. If the wave frequency is higher than the buoyancy frequency, then the frequency isolines are hyperbolas; and if the wave frequency is equal to the Brunt-Väisälä frequency, then the isolines are two straight lines parallel the direction to the east. The vertical wave momentum fluxes are obtained as functions of the direction of wave propagation. It is shown that the fluxes are maximum in absolute value when the wave propagates to the north or to the south. A comparison of the vertical momentum fluxes of internal and sub-inertial waves at the same length and the maximum wave amplitude is carried out. It is shown that the vertical momentum flux of sub-inertial waves is higher than that of internal waves and weakens with weakening of stratification.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 3","pages":""},"PeriodicalIF":0.6,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrodynamic Instability of Spatially Periodic Flows of Homogeneous and Stratified Fluid with Regard for Friction. Formation of Steady-State Vortex Disturbances 考虑摩擦的均匀和分层流体空间周期流动的水动力不稳定性。稳态涡旋扰动的形成

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2025-06-17 DOI: 10.1134/S0015462825600415

M. V. Kalashnik

引用次数: 0

Three-Dimensional Simulation of Drop-on-Drop Impact: Coaxial and Offset Dynamics 落对落碰撞的三维模拟：同轴和偏移动力学

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-05-12 DOI: 10.1134/S0015462824604881

Umesh, N. K. Singh

引用次数: 0

Performance Analysis of Hybrid Vertical Axis Wind Turbine in Low Wind Velocity Regions Using CFD 基于CFD的低风速区混合垂直轴风力机性能分析

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-05-12 DOI: 10.1134/S0015462824604455

S. Roga, J. S. Bhausaheb, A. R. Sengupta

{"title":"Performance Analysis of Hybrid Vertical Axis Wind Turbine in Low Wind Velocity Regions Using CFD","authors":"S. Roga, J. S. Bhausaheb, A. R. Sengupta","doi":"10.1134/S0015462824604455","DOIUrl":"10.1134/S0015462824604455","url":null,"abstract":"There is a significant contribution of the wind energy to total renewable energy consumption. In vertical axis wind turbines (VAWTs), most of the experimental works are done on the Darrieus VAWT or Savonius VAWT alone. However, the experimental results cannot capture all the aerodynamic characteristics of the turbine. Therefore, computational analysis is the most powerful tool for reducing the time and cost of experimental analysis in this type of research. Recently, research on hybrid wind turbines is attaining popularity because such coaxial arrangements exhibit the improved efficiency and the better self-starting capability as compared to individual Darrieus or Savonius turbines. In this present study, firstly, a wind dataset was collected for different seasons and heights (above ground level) to get the average wind speed as an inlet boundary condition. Then two-dimensional simulation was performed on the considered hybrid VAWT using ANSYS Fluent. The steady analysis shows that the static torque is low at 90° azimuthal angle for the hybrid VAWT at different heights in all cases. For various tip speed ratios, flow visualization through a hybrid turbine showed that vortex generation is lower at the high tip speed ratio (TSR) as compared to the low TSR. At TSR = 2.5, all attachment angles achieve the highest power coefficients, which decline with increase in the attachment angles. Among all the operating conditions, the TSR = 2.5 and the 0° attachment angle revealed the optimal power coefficient value of 0.33.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gas-Droplet Turbulent Jets with Phase Transitions and Droplet Collisions 具有相变和液滴碰撞的气滴湍流射流

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-05-12 DOI: 10.1134/S0015462824603437

Yu. V. Zuev

引用次数: 0