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HYDRODYNAMICS OF NON-MAGNETIC DROPLETS IN MAGNETIC FLUIDS IN MICROFLUIDIC CHIPS UNDER THE INFLUENCE OF INHOMOGENEOUS MAGNETIC FIELDS 非均相磁场影响下微流控芯片磁性流体中非磁性液滴的流体力学
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-10-28 DOI: 10.1134/S0021894424020032
P. A. Ryapolov, E. A. Sokolov, D. A. Kalyuzhnaya, E. V. Sheldeshova, I. A. Shabanova
{"title":"HYDRODYNAMICS OF NON-MAGNETIC DROPLETS IN MAGNETIC FLUIDS IN MICROFLUIDIC CHIPS UNDER THE INFLUENCE OF INHOMOGENEOUS MAGNETIC FIELDS","authors":"P. A. Ryapolov,&nbsp;E. A. Sokolov,&nbsp;D. A. Kalyuzhnaya,&nbsp;E. V. Sheldeshova,&nbsp;I. A. Shabanova","doi":"10.1134/S0021894424020032","DOIUrl":"10.1134/S0021894424020032","url":null,"abstract":"<p>This paper presents the results of a study of the influence of various sources of magnetic field on the size of droplets formed in microfluidic flows. Direct and reverse emulsions in a microfluidic flow focusing were obtained using magnetic fluids based on oil and water which are a continuous phase. Non-magnetic inclusions of various volumes were formed depending on the selected parameters: continuous phase flow rate, magnetic field configuration, and the position of the magnet relative to the axis of the device.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 2","pages":"210 - 219"},"PeriodicalIF":0.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142555237","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
COMPARISON OF RESULTS OF RANS AND ILES BASED CALCULATIONS FOR A THICK TEARDROP AIRFOIL AT LOW REYNOLDS NUMBERS 在低雷诺数的一个厚泪滴翼型的rans和iles基于计算结果的比较
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-10-28 DOI: 10.1134/S0021894424020056
M. A. Akimov, P. A. Polivanov, A. A. Sidorenko
{"title":"COMPARISON OF RESULTS OF RANS AND ILES BASED CALCULATIONS FOR A THICK TEARDROP AIRFOIL AT LOW REYNOLDS NUMBERS","authors":"M. A. Akimov,&nbsp;P. A. Polivanov,&nbsp;A. A. Sidorenko","doi":"10.1134/S0021894424020056","DOIUrl":"10.1134/S0021894424020056","url":null,"abstract":"<p>A flow around a symmetrical thick teardrop airfoil in a nonstationary formulation is numerically modeled at Reynolds numbers <span>(mathrm{Re}=10^4{-}10^5)</span> and in a range of angles of attack <span>(alpha=~-10{-}10^circ)</span>. Calculations are based on the approximation of unsteady Reynolds-averaged Navier–Stokes (URANS) equations using the implicit large-eddy simulation (ILES). The URANS approach requires that the position of a laminar-turbulent transition is determined using <span>(k{-}kl{-}omega)</span> and <span>(k{-}omega{-}gamma{-}mathrm{Re}_theta)</span> models, as well as (<span>(k{-}omega)</span>)-SST models with a given laminar flow region. It is shown that the flow pattern and aerodynamic characteristics of the airfoil are greatly affected by the position of the laminar-turbulent transition region. It is suggested by the comparison of the results obtained using the ILES approach with experimental data that they are in good agreement. The URANS based calculations do not yield results consistent with experimental data. Fixing the laminar-turbulent transition point in the URANS calculation in some cases make it possible to correct the results.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 2","pages":"233 - 248"},"PeriodicalIF":0.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142906096","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
FORMATION OF CHAIN CLUSTERS DURING BUBBLE MOTION FROM A SINGLE CAPILLARY IN AN INCLINED PIPE 倾斜管道中的单个毛细管在气泡运动过程中形成链簇
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-08-21 DOI: 10.1134/S0021894424010127
A. E. Gorelikova, O. N. Kashinsky, A. V. Chinak
{"title":"FORMATION OF CHAIN CLUSTERS DURING BUBBLE MOTION FROM A SINGLE CAPILLARY IN AN INCLINED PIPE","authors":"A. E. Gorelikova,&nbsp;O. N. Kashinsky,&nbsp;A. V. Chinak","doi":"10.1134/S0021894424010127","DOIUrl":"10.1134/S0021894424010127","url":null,"abstract":"<p>The sizes and rise velocity of bubbles in a stationary liquid in an inclined channel with a circular cross-section at different gas flow rates through a capillary were determined (3.0–5.5 ml/min). The size and velocity of gas bubbles were studied by shadow photography. It is shown that in the range of channel inclination angles 40–60°, the formation of stable bubble structures—clusters consisting of bubbles of the same size (1.5–1.8 mm) — is possible. In regimes without the formation of chain clusters, the average diameter of gas bubbles increased (2.0–2.2 mm) due to their coalescence.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 1","pages":"105 - 111"},"PeriodicalIF":0.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200223","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
DESIGN, ADJUSTMENT, AND MODE RESEARCH OF LOW-EMISSION BURNER FOR FUEL COMBUSTION IN A SUPERHEATED STEAM JET 过热蒸汽喷射中燃料燃烧的低排放燃烧器的设计、调整和模式研究
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-08-21 DOI: 10.1134/S0021894424010012
I. S. Sadkin, M. A. Mukhina, E. Yu. Shadrin, E. P. Kopyev
{"title":"DESIGN, ADJUSTMENT, AND MODE RESEARCH OF LOW-EMISSION BURNER FOR FUEL COMBUSTION IN A SUPERHEATED STEAM JET","authors":"I. S. Sadkin,&nbsp;M. A. Mukhina,&nbsp;E. Yu. Shadrin,&nbsp;E. P. Kopyev","doi":"10.1134/S0021894424010012","DOIUrl":"10.1134/S0021894424010012","url":null,"abstract":"<p>This study touches upon the characteristics of liquid (diesel) fuel combustion in a high-velocity jet of superheated steam in the combustor of a hot water boiler, the thermal power of the burner being approximately equal to 40 kW. It is shown that the burner based on the steam fuel atomizing technology meets modern technical and environmental standards and is quite advantageous in relation to its analogs. It is revealed adding steam makes it possible to cause a severalfold decrease in CO and NO<span>(_x)</span>concentrations in combustion products. At the same time, the amount of carbon monoxide and nitrogen oxide emissions when using this burner is quite smaller (2.5- and 1.4-fold, respectively) than when using a Weishaupt burner. Recommendations for optimizing the operation of such devices are presented.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 1","pages":"1 - 6"},"PeriodicalIF":0.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200213","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
EXPERIMENTAL STUDY OF THE FLOW AND BREAKUP OF A TWO-PHASE COAXIAL MICRO JET 两相同轴微射流的流动和破裂实验研究
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-08-21 DOI: 10.1134/S0021894424010024
M. N. Ryabov, O. A. Gobyzov, R. Kh. Abdrakhmanov, A. V. Bilsky
{"title":"EXPERIMENTAL STUDY OF THE FLOW AND BREAKUP OF A TWO-PHASE COAXIAL MICRO JET","authors":"M. N. Ryabov,&nbsp;O. A. Gobyzov,&nbsp;R. Kh. Abdrakhmanov,&nbsp;A. V. Bilsky","doi":"10.1134/S0021894424010024","DOIUrl":"10.1134/S0021894424010024","url":null,"abstract":"<p>The breakup of a jet consisting of two coaxial jets of immiscible liquids has been studied experimental with varying phase flow rates. Distilled water and a mixture of polymethylsiloxanes were used as working liquids. Jet breakup regimes, the types of capsules formed, and the sizes of single-core capsules formed under the influence of capillary instability were determined. The natural frequencies of surface instability were measured.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 1","pages":"7 - 17"},"PeriodicalIF":0.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200214","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
ENERGY APPROACH TO ESTIMATING THE QUALITY OF THE SPRAY GENERATED BY A MODEL PNEUMATIC ATOMIZER 估算模型气动雾化器产生的喷雾质量的能量方法
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-08-21 DOI: 10.1134/S0021894424010097
V. M. Boiko, A. Yu. Nesterov, S. V. Poplavski
{"title":"ENERGY APPROACH TO ESTIMATING THE QUALITY OF THE SPRAY GENERATED BY A MODEL PNEUMATIC ATOMIZER","authors":"V. M. Boiko,&nbsp;A. Yu. Nesterov,&nbsp;S. V. Poplavski","doi":"10.1134/S0021894424010097","DOIUrl":"10.1134/S0021894424010097","url":null,"abstract":"<p>The efficiency of fluid atomization by an atomizer is studied as a function of the spray energy. The dependence of the maximum values of energy on the fluid flow rate is analyzed. A linear dependence is obtained for flow rates smaller than 80 g/s, which testifies to a high efficiency of fluid atomization. For flow rates greater than 80 g/s, the droplet energy is seen to decrease drastically, leading to an increase in the spray droplet size, which shows that the atomization quality is deteriorated. This behavior is observed in all regimes considered in the study.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 1","pages":"76 - 79"},"PeriodicalIF":0.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200221","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
EFFECT OF WALL HEATING ON THE CHARACTERISTICS OF NEAR-WALL REVERSE FLOW EVENTS OCCURRING IN A TURBULENT DUCT 壁面加热对湍流管道中发生的近壁逆流事件特征的影响
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-08-21 DOI: 10.1134/S0021894424010139
I. V. Chuprov, V. A. Ivashchenko, R. I. Mullyadzhanov, D. I. Zaripov
{"title":"EFFECT OF WALL HEATING ON THE CHARACTERISTICS OF NEAR-WALL REVERSE FLOW EVENTS OCCURRING IN A TURBULENT DUCT","authors":"I. V. Chuprov,&nbsp;V. A. Ivashchenko,&nbsp;R. I. Mullyadzhanov,&nbsp;D. I. Zaripov","doi":"10.1134/S0021894424010139","DOIUrl":"10.1134/S0021894424010139","url":null,"abstract":"<p>Direct numerical simulation is used to study the effect of wall heating on the characteristics of a near-wall reverse flow during a turbulent stream of various coolants in a duct. A temperature field is considered both in a passive scalar approximation and in a low Mach number approximation. Qualitative and quantitative results are obtained that characterize the probability of occurrence of a near-wall reverse flow in all the cases considered at a Reynolds number <span>(mathrm{Re}= 3150)</span> based on mean flow velocity and duct half-height. It is revealed that, in the cases considered, the wall heating causes a two- or a threefold increase in the probability of near-wall reverse flow formation .</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 1","pages":"112 - 120"},"PeriodicalIF":0.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200225","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
ESTIMATION OF COUPLING IN A HEAT CONDUCTION EQUATION WITHIN THE DYNAMIC THEORY OF THERMAL ELASTICITY FOR A CLASS OF BRITTLE MATERIALS 一类脆性材料热弹性动态理论中热传导方程耦合的估算
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-08-21 DOI: 10.1134/S0021894424010164
V. A. Kirichek
{"title":"ESTIMATION OF COUPLING IN A HEAT CONDUCTION EQUATION WITHIN THE DYNAMIC THEORY OF THERMAL ELASTICITY FOR A CLASS OF BRITTLE MATERIALS","authors":"V. A. Kirichek","doi":"10.1134/S0021894424010164","DOIUrl":"10.1134/S0021894424010164","url":null,"abstract":"<p>A heat conduction equation within the framework of the coupled dynamic theory of thermoelasticity is considered. Coupling in the heat conduction equation is estimated for a space with a constant initial temperature. This space contains a flat semi-infinite crack propagating at a constant velocity, and a constant temperature lower than an initial one (thermal shock) is instantly established on the edges of this space. The movement of the crack and the thermal shock on its shores determine dynamic effects that should be taken into account to estimate coupling in the heat conduction equation. It is demonstrated that, under real conditions of a thermal shock on massive bodies with cracks, one may ignore dynamic effects and coupling for materials that satisfy certain conditions imposed on their thermomechanical constants. This significantly simplifies the process of solving thermoelasticity problems for such bodies.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 1","pages":"152 - 160"},"PeriodicalIF":0.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200227","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
MATHEMATICAL MODEL OF HEMODYNAMIC RESTRUCTURING IN THE ENVIRONMENT OF A VASCULAR MALFORMATION DURING NEUROSURGICAL INTERVENTION 神经外科干预过程中血管畸形环境下血液动力学重组的数学模型
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-08-21 DOI: 10.1134/S0021894424010115
A. A. Cherevko, T. S. Sharifullina, V. A. Panarin
{"title":"MATHEMATICAL MODEL OF HEMODYNAMIC RESTRUCTURING IN THE ENVIRONMENT OF A VASCULAR MALFORMATION DURING NEUROSURGICAL INTERVENTION","authors":"A. A. Cherevko,&nbsp;T. S. Sharifullina,&nbsp;V. A. Panarin","doi":"10.1134/S0021894424010115","DOIUrl":"10.1134/S0021894424010115","url":null,"abstract":"<p>An approach is proposed to model hemodynamics in an arteriovenous malformation and its vascular environment during neurosurgical embolization. This approach is based on a combination of the filtration flow model for blood and embolic agent in the malformation and the hydraulic approximation for the vessels surrounding the malformation. The model is described mathematically by a system of integrodifferential hyperbolic equations. The parameters and functions included in the model are determined using clinical data from real patients. Based on this model, the problem of optimal control of multistage embolization was formulated and studied numerically in a special class of controls. Optimal embolization regimes were found for which there is good agreement between the calculated and clinical data. The proposed approach can be used to develop preoperative recommendations about the optimal surgical intervention tactics.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 1","pages":"92 - 104"},"PeriodicalIF":0.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200224","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 DISTRIBUTION IN A LAMINAR FLAME MEASURED BY LASER-INDUCED HYDROXYL RADICAL FLUORESCENCE 用激光诱导羟基自由基荧光测量层流火焰中的温度分布
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-08-21 DOI: 10.1134/S0021894424010188
R. V. Tolstoguzov, A. G. Savitskii, V. M. Dulin
{"title":"TEMPERATURE DISTRIBUTION IN A LAMINAR FLAME MEASURED BY LASER-INDUCED HYDROXYL RADICAL FLUORESCENCE","authors":"R. V. Tolstoguzov,&nbsp;A. G. Savitskii,&nbsp;V. M. Dulin","doi":"10.1134/S0021894424010188","DOIUrl":"10.1134/S0021894424010188","url":null,"abstract":"<p>This paper presents experimental measurements of flame temperature in the presence of an impact surface and a liquid phase added to the flow. The temperature is measured using laser-induced fluorescence. In the case of a flame of a pre-mixed methane-air mixture with a stoichiometric coefficient <span>(Phi = 0.92)</span> and a Reynolds number <span>(mathrm{Re}= 1000)</span>, a reverse flow zone is detected near the impact surface when this surface is located at a distance of three calibers from the nozzle exit. The temperature field of a gas-droplet flame is measured using laser-induced fluorescence.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 1","pages":"176 - 182"},"PeriodicalIF":0.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200228","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
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