Fluid Dynamics最新文献_第5页

Evolution of the Plasmodynamic Structure of the Penning Discharge under Variation of Pressure and Magnetic Field Induction 压力和磁场感应变化下潘宁放电等离子体动力学结构的演化

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-02-17 DOI: 10.1134/S0015462825604395

S. T. Surzhikov

{"title":"Evolution of the Plasmodynamic Structure of the Penning Discharge under Variation of Pressure and Magnetic Field Induction","authors":"S. T. Surzhikov","doi":"10.1134/S0015462825604395","DOIUrl":"10.1134/S0015462825604395","url":null,"abstract":"Numerical investigation of regularities in the variation of the electrodynamic structure of the Penning discharge in molecular hydrogen under variations in pressure from p = 0.5 to 5.0 mTorr and magnetic field induction in the range of Bx = 0.001–0.3 T is carried out using the diffusion-drift model which involves the nonlinear dependence of ion and electron drift velocities on the electric field strength and the Thomson coefficient of impact ionization of neutral particles by electrons at large reduced electric fields. As a result of the numerical simulation, configurations of gas-discharge plasma corresponding to different regimes of Penning discharge combustion have been found. In the pressure and magnetic field induction range under study, the transition between modes of weak and strong fields has been traced. In the transition region, regimes of Penning discharge combustion with the formation of nonstationary vortex structures of gas-discharge plasma in near-axis regions and, as a consequence, generation of pulse-periodic emission of ion beams from the meniscus of the discharge chamber have been revealed.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 8","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339908","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

Thermal Dispersion in Spiral Combustion on a Porous Plane Surface 多孔平面表面螺旋燃烧中的热分散

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-02-16 DOI: 10.1134/S0015462825603651

A. A. Markov

引用次数: 0

The Solubility Effect on the Cavity Bottom Structure as a Result of Drop Coalescence in an Impact Regime 冲击状态下水滴聚结对空腔底部结构的溶解度影响

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-02-16 DOI: 10.1134/S0015462825603699

Yu. D. Chashechkin, A. Yu. Ilinykh

{"title":"The Solubility Effect on the Cavity Bottom Structure as a Result of Drop Coalescence in an Impact Regime","authors":"Yu. D. Chashechkin, A. Yu. Ilinykh","doi":"10.1134/S0015462825603699","DOIUrl":"10.1134/S0015462825603699","url":null,"abstract":"The multipoint illumination is used to visualize the flow pattern produced by a free falling drop in a fluid at rest. The initial stage of merging of a potassium permanganate solution drop with water and a water drop with ammonium thodanide solution as well as the spreading of a drop of aniline and crude oil in a pool of water is studied. Emphasis is placed on an analysis of the flow pattern near the cavity bottom in the impact regime, when the kinetic energy of the drop is considerably greater than its potential surface energy. An “intermediate layer” is formed under the cavity bottom upon the contact of the mixing fluids. This layer is the product of dissolution of thin fibers of the drop substance intruding into the target fluid. Poorly soluble aniline forces partially through the cavity bottom. In the experimental conditions the oil does not penetrate through the surface of the fluid in the initial stage of the flow. The values of the conventional dimensionless parameters, which are the Reynolds, Froude, Weber, Bond, and Ohnesorge numbers, are presented, together with certain additional parameters, namely, the ratios of energy components and their densities, as well as the relative densities and surface tension coefficients of the media in contact.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 8","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339470","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

Temperature Dependence of the Exothermic Gas-Phase Reaction Rate Constants at Temperatures up to 500 K 温度高达500k时放热气相反应速率常数的温度依赖性

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-02-16 DOI: 10.1134/S0015462825603730

M. F. Danilov

{"title":"Temperature Dependence of the Exothermic Gas-Phase Reaction Rate Constants at Temperatures up to 500 K","authors":"M. F. Danilov","doi":"10.1134/S0015462825603730","DOIUrl":"10.1134/S0015462825603730","url":null,"abstract":"The aim of the study is to increase the accuracy of determining the gas-phase chemical reaction rate constants by means of numerical methods. The problems of justifying the choice of regression functions and refining their parameters in determination of the temperature dependence of the exothermic reaction rate constants are solved. The methods of solving are aimed at detecting the uncertainty components of the regression parameters associated with systematic effects, followed by their elimination or compensation. The specific features of using the Arrhenius law to approximate the temperature dependences of exothermic reactions are found from the results of numerical investigations. Despite the universal form of the law in the chemical reaction kinetics field, the utility of using the Arrhenius law as a universal model can be called into question in the regression analysis of experimental data. It is found that the unjustified choice of the regression model serves as a source of an additional uncertainty of the regression parameters, the revealed correlation dependence of the parameters results from the excessive complexity of the model. It is demonstrated that a simpler model based on a power-law function describes the temperature dependence of the exothermic reaction rate constants fairly well. Particular calculations and estimations are carried out with reference to the OH + O → O2 + H and O3 + H → OH + O2 reactions over the temperature range from 150 to 500 K.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 8","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339608","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

The Effects of Single and Multiple Dielectric Barrier Discharge Characteristics on Flow Separation Control over NACA0012 Airfoil 单、多介质阻挡放电特性对NACA0012翼型流动分离控制的影响

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-02-16 DOI: 10.1134/S0015462825603341

A. Rahni, A. Jahangirian

{"title":"The Effects of Single and Multiple Dielectric Barrier Discharge Characteristics on Flow Separation Control over NACA0012 Airfoil","authors":"A. Rahni, A. Jahangirian","doi":"10.1134/S0015462825603341","DOIUrl":"10.1134/S0015462825603341","url":null,"abstract":"The performances of single and multiple plasma actuators on NACA 0012 airfoil at the Reynolds number of one million are investigated. A numerical method is used for flow simulation in solving the Reynolds-averaged Navier–Stokes equations together with the SST-kω turbulence model. Maxwell’s equations are also used for simulation of the electro-hydrodynamic (EHD) field using the Suzen model. The effect of the plasma actuator has been modeled at various angles of attack and actuator voltages. Initially, simulations are performed for a single actuator at different positions, and then for two actuators. Various simulations are performed for different angles of attack, voltages, and actuator positions. The results for the lift coefficient, the drag coefficient, and the aerodynamic efficiency are presented. An analysis of the results showed that in a single-actuator configuration, the installation position significantly affects the lift coefficient. In this case, the leading edge is the best point for actuator installation. Using two actuators increased the lift coefficient and decreased the drag coefficient, with the magnitude of these changes depending on the voltage and the angle of attack.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 8","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339712","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

Generalized Labuntsov–Yagov Model for Single Sessile Vapor Bubble Growth in Microgravity 微重力下单无柄气泡生长的广义Labuntsov-Yagov模型

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-02-16 DOI: 10.1134/S001546282560422X

F. V. Ronshin, A. I. Zorkina, A. Rednikov, L. Tadrist, O. A. Kabov

{"title":"Generalized Labuntsov–Yagov Model for Single Sessile Vapor Bubble Growth in Microgravity","authors":"F. V. Ronshin, A. I. Zorkina, A. Rednikov, L. Tadrist, O. A. Kabov","doi":"10.1134/S001546282560422X","DOIUrl":"10.1134/S001546282560422X","url":null,"abstract":"This study investigates the dynamics of single vapor bubble growth in near-saturated liquids under microgravity conditions, with particular emphasis on heat transfer mechanisms and evaporation phenomena. The research presents experimental validation of theoretical models for bubble growth kinetics across multiple pressure regimes (500–750 mbar) and thermal configurations, including systematic analysis of equivalent bubble diameter evolution, wall superheat dynamics, waiting time effects, and the influence of superheated layer characteristics on growth behavior. A generalized model has been developed based on the Labuntsov–Yagov correlation framework that incorporates time-dependent wall superheat conditions and accounts for evaporation contributions from both the contact line region and the bulk liquid-vapor interface. Comprehensive comparison between model predictions and experimental measurements demonstrates good agreement across the investigated parameter space, confirming the model’s validity and its capability to accurately capture the complex interplay between thermal boundary conditions and bubble growth dynamics under microgravity.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 8","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339474","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

Reynolds Analogy Coefficient in a Compressible Turbulent Boundary Layer with a Pressure Gradient 具有压力梯度的可压缩湍流边界层的雷诺数类比系数

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-02-16 DOI: 10.1134/S0015462825603882

V. G. Lushchik, A. I. Reshmin

引用次数: 0

Computational Investigation on Aerodynamic Characteristics of Low-Aspect-Ratio NACA 4412 Wings in Low-Re Flows: Comparative Study on CFD and Panel Methods 低回流下低展弦比NACA 4412机翼气动特性的计算研究：CFD与面板方法的对比研究

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-02-16 DOI: 10.1134/S0015462825602712

Y. Eraslan, A. Sumnu

{"title":"Computational Investigation on Aerodynamic Characteristics of Low-Aspect-Ratio NACA 4412 Wings in Low-Re Flows: Comparative Study on CFD and Panel Methods","authors":"Y. Eraslan, A. Sumnu","doi":"10.1134/S0015462825602712","DOIUrl":"10.1134/S0015462825602712","url":null,"abstract":"This study presents a comprehensive evaluation and comparison on the performances of the vortex lattice method (VLM), the 3D-panel method (PM), and the computational fluid dynamics (CFD) methods for the Reynolds-averaged Navier–Stokes (RANS) equations and large-eddy simulation (LES) in predicting aerodynamic characteristics of low-aspect-ratio wings in low-Reynolds number flows. The primary aim is to investigate the capability of the models in capturing separation bubbles and complex flow behaviors with a particular focus on a wide range of high angles of attack. Accordingly, the low-aspect-ratio (AR = 1 and AR = 3) wings with a well-known NACA 4412 airfoil have been modelled and investigated at the Reynolds numbers 2.5 × 104 and 7.5 × 104 using the aforementioned methods to make a comparison on lift and drag prediction capabilities. The grid independence studies are conducted for both methods and ensure that the results are independent of the number of mesh or panel elements. Initially, the results of VLM and PM are compared with the RANS CFD analysis results carried out using k–kL–ω transition turbulence model. The further analyses are performed using various turbulence models (RNG k–ε, transition SST, k–kL–ω transition, realizable k–ε models), and the results are compared with large-eddy simulation (LES) analyses and the experimental wind tunnel data available in literature.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 8","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339468","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

Calculation of Distillation Curves of Hydrocarbon and Oxygenate Mixtures Using Activity Coefficients 用活度系数计算烃类和含氧混合物的蒸馏曲线

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-02-16 DOI: 10.1134/S0015462825604152

K. D. Tsapenkov, Yu. G. Kuraeva, E. I. Sidorova, Al. E. Shtyrlov, A. Yu. Kuznetsov, I. A. Zubrilin

{"title":"Calculation of Distillation Curves of Hydrocarbon and Oxygenate Mixtures Using Activity Coefficients","authors":"K. D. Tsapenkov, Yu. G. Kuraeva, E. I. Sidorova, Al. E. Shtyrlov, A. Yu. Kuznetsov, I. A. Zubrilin","doi":"10.1134/S0015462825604152","DOIUrl":"10.1134/S0015462825604152","url":null,"abstract":"This work is devoted to the calculation of the distillation curve of mixed fuels including petroleum hydrocarbons and biocomponents. When calculating the distillation curves of such fuels using the standard technique, in some cases there is a significant deviation at the beginning of the graph. Therefore, in this work, activity coefficients were used to determine the saturated vapor pressure of the mixture when calculating the distillation curves. The distillation curves of the tetradecane – propanol-1 mixture were calculated taking into account the activity coefficient in the Raoult equation when determining the saturated vapor pressure of the mixture. The obtained distillation curves were compared with the experimental data also obtained by the authors of the work. Systems with different contents of the oxygen-containing component (25, 50, and 75 vol %) were considered. The UNIFAC model was used to calculate the activity coefficient. The results showed that the use of activity coefficients leads to a decrease in the discrepancy between the calculated and experimental distillation curves for mixtures with a biocomponent content of up to 50%.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 8","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339499","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

Graphite Ablation in Subsonic Dissociated Flows of Nitrogen, Carbon Dioxide, Their Mixture and under Laser Surface Heating 激光表面加热下氮气、二氧化碳及其混合物亚声速解离流中的石墨烧蚀

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-02-16 DOI: 10.1134/S0015462825603742

A. V. Chaplygin, M. Yu. Yakimov, S. A. Vasil’evskii, I. V. Lukomskii, S. S. Galkin, M. A. Kotov, A. N. Shemyakin, N. G. Solovyov, A. F. Kolesnikov

引用次数: 0