发布求助
文献互助 智能选刊 最新文献

Fluid Dynamics最新文献

筛选
英文 中文
New Models of Heterogeneous Catalysis for Numerical Study of Flows and Heat Transfer in an Induction HF Plasmatron
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-11-12 DOI: 10.1134/S0015462824603097
A. A. Krupnov, M. Yu. Pogosbekyan, V. I. Sakharov
{"title":"New Models of Heterogeneous Catalysis for Numerical Study of Flows and Heat Transfer in an Induction HF Plasmatron","authors":"A. A. Krupnov,&nbsp;M. Yu. Pogosbekyan,&nbsp;V. I. Sakharov","doi":"10.1134/S0015462824603097","DOIUrl":"10.1134/S0015462824603097","url":null,"abstract":"<p>Numerical simulation of the flow of multicomponent nonequilibrium dissociated air past a water-cooled cylindrical model in underexpanded supersonic jets of high-enthalpy air is carried out within the framework of the Navier–Stokes equations using the stage-by-stage heterogeneous kinetics of interaction of dissociated air with the surfaces of β-cristobalite and copper and taking into account chemical reactions in flow for the conditions of experiments on heat transfer in the induction HF plasmatron VGU-4 (IPMech RAS). Numerical solutions for the chemical composition of the gas and for heat fluxes to the surface of the sensors are compared for various catalysis models. The contribution of diffusion and heat conduction processes to the heat flux to the surface is shown in various regimes of the interaction of gas with the surface material. The dependence of the flow characteristics (the chemical composition of the gas on the surface, the degree of filling of the surface, and the heat flux to the surface) on the density of adsorption sites has been determined. The modification of this dependence makes it possible to describe the entire range of the boundary conditions from non-catalytic to full catalytic ones.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 5","pages":"1154 - 1167"},"PeriodicalIF":1.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108571","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 Investigation of the Transverse Size of a Viscous Jet Flowing out of a Capillary Channel
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-11-12 DOI: 10.1134/S0015462824603000
A. A. Safronov, A. A. Koroteev, A. E. Agafonov, A. L. Grigor’ev, N. I. Filatov
{"title":"Experimental Investigation of the Transverse Size of a Viscous Jet Flowing out of a Capillary Channel","authors":"A. A. Safronov,&nbsp;A. A. Koroteev,&nbsp;A. E. Agafonov,&nbsp;A. L. Grigor’ev,&nbsp;N. I. Filatov","doi":"10.1134/S0015462824603000","DOIUrl":"10.1134/S0015462824603000","url":null,"abstract":"<p>The radii of the orifice of a capillary channel and a jet flowing out of it are generally different. Fluid friction on the channel walls leads to the parabolic velocity distribution, while small shear stresses at the free jet boundary are responsible for the velocity profile equalization. Dissipation has an effect on both the length of the region, where the velocity profile is settled, and its radius-average value, as well as on the steady-state jet radius. Previously, the corresponding problem was theoretically solved in the axisymmetric approximation. However, the symmetry condition is not fulfilled in the case of small Reynolds numbers, owing to the occurrence of a bend flow region. Moreover, in the jets flowing out at a low velocity there occur the phenomena of global and boundary instability of the capillary flow. The totality of the nonlinear, mutually-agreed effects leads to velocity profile deformation, such that it becomes asymmetric with respect to the axis in the region, where its value is settled, and the nonuniqueness of the Reynolds-number dependence of the jet radius. The results of an experimental investigation of the dependence of the steady radius of highly viscous jets on the outflow velocity are for the first time presented for the case in which the bend flow region arises.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 5","pages":"1066 - 1071"},"PeriodicalIF":1.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108623","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
Specific Features of Modeling Nanofluid Flows (a Review)
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-11-12 DOI: 10.1134/S0015462824602882
V. Ya. Rudyak
{"title":"Specific Features of Modeling Nanofluid Flows (a Review)","authors":"V. Ya. Rudyak","doi":"10.1134/S0015462824602882","DOIUrl":"10.1134/S0015462824602882","url":null,"abstract":"<p>Problems arising when modeling nanofluids are discussed. The possibility of using two- and one-fluid descriptions is analyzed. The thermophysical properties of nanofluids are reviewed and it is shown that their viscosity and thermal conductivity depend not only on the concentration of nanoparticles, but also on their size and material. The behavior of similarity parameters and their dependence on the concentration, size and material of nanoparticles are studied in detail. It is shown that in the general case it is impossible to solve the problem simply by varying the similarity parameters. Two examples of solving the problem of heat transfer of two different nanofluids, with conventional spherical nanoparticles and with carbon nanotubes, are given. In the latter case, the nanofluid is non-Newtonian. It has been shown that nanofluids make it possible to obtain very high values of excess of the heat transfer coefficient.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 5","pages":"1072 - 1087"},"PeriodicalIF":1.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0015462824602882.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Modeling of the Effect of Supersonic Vortex Structures on the Heat Transfer on the Lifting Surfaces of Flight Vehicles
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-11-12 DOI: 10.1134/S0015462824602997
V. E. Borisov, T. V. Konstantinovskaya, A. E. Lutskii
{"title":"Numerical Modeling of the Effect of Supersonic Vortex Structures on the Heat Transfer on the Lifting Surfaces of Flight Vehicles","authors":"V. E. Borisov,&nbsp;T. V. Konstantinovskaya,&nbsp;A. E. Lutskii","doi":"10.1134/S0015462824602997","DOIUrl":"10.1134/S0015462824602997","url":null,"abstract":"<p>The simultaneous flow past two rectangular tandem wings is considered. The heat loads on the main wing are studied as functions of the intensity of the vortex formations produced by a generator. The following flow regimes are considered; the freestream Mach number М<sub>∞</sub> = 3 and the attack angles of the generator are 10° and 20°. It is shown that under certain conditions the surface temperature of the main wing can be considerably reduced due to its interaction with vortex structures.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 5","pages":"1099 - 1107"},"PeriodicalIF":1.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108659","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 Flow Swirling on the Subsonic Air Jet in the VGU-4 HF Plasmatron
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-11-12 DOI: 10.1134/S0015462824603255
S. A. Vasil’evskii, A. F. Kolesnikov
{"title":"Effect of Flow Swirling on the Subsonic Air Jet in the VGU-4 HF Plasmatron","authors":"S. A. Vasil’evskii,&nbsp;A. F. Kolesnikov","doi":"10.1134/S0015462824603255","DOIUrl":"10.1134/S0015462824603255","url":null,"abstract":"<p>The effect of taking into account stream swirl when calculating the flow of a subsonic air plasma jet past a cylindrical model of 50 mm in diameter when the jet flows out from the discharge channel into the test chamber of the VGU-4 IPMech RAS HF plasmatron is studied. A comparison has been made of calculations of axisymmetric flow past the model based on the full Navier–Stokes equations taking into account (new results) and without taking into account (old results) the tangential velocity component <i>w</i> under the experimental conditions at a pressure of 80 mbar in a wide range of anode supply power at various distances from the plasmatron channel outlet to the model. It is shown that when calculating the VGU-4 plasmatron for a low power with taking into account flow swirl, the pattern of flow past the frontal part of the model is modified, namely, a vortex region is formed in front of the model instead of a relatively thin boundary layer. For moderate and high plasmatron power, the effect of taking into account swirl on the isolines of the dimensionless stream function and on the isotherms is small in the jet core region in front of the model, but is significant in the outer flow region in the test chamber.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 5","pages":"1129 - 1136"},"PeriodicalIF":1.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108575","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 the Maximum Migration Distance of a Finite Volume of Light Fluid in a Saturated Porous Medium
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-11-12 DOI: 10.1134/S0015462824602493
A. A. Afanasyev, E. A. Vedeneeva, I. E. Mikheev
{"title":"Estimation of the Maximum Migration Distance of a Finite Volume of Light Fluid in a Saturated Porous Medium","authors":"A. A. Afanasyev,&nbsp;E. A. Vedeneeva,&nbsp;I. E. Mikheev","doi":"10.1134/S0015462824602493","DOIUrl":"10.1134/S0015462824602493","url":null,"abstract":"<p>Flow of a light fluid through a porous medium saturated with another (heavy) fluid is studied. The one-dimensional formulation of the problem describing two-phase flow in a vertical isolated porous column is considered. Assuming that the volume of light liquid is finite, its maximum upward motion under the action of the buoyancy force is estimated. A simple method for approximate estimate of this migration distance is proposed. It is shown that it is determined by only a single dimensionless number (similarity criterion) over a wide range of fluid and porous medium parameters, and the effect of other parameters is small. The dependence of the maximum migration distance on the distingushed similarity criterion is calculated. The results of study can be useful in estimating the maximum distance over which the injected gas propagates from the well through a water-saturated formation.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 5","pages":"1056 - 1065"},"PeriodicalIF":1.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108664","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
Supersonic Gas Flow in a Plane Channel with a Normal Glow Discharge in the Magnetic Field
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-11-12 DOI: 10.1134/S0015462824603991
S. T. Surzhikov
{"title":"Supersonic Gas Flow in a Plane Channel with a Normal Glow Discharge in the Magnetic Field","authors":"S. T. Surzhikov","doi":"10.1134/S0015462824603991","DOIUrl":"10.1134/S0015462824603991","url":null,"abstract":"<p>The results of numerical study of the interaction of supersonic molecular nitrogen flow with a normal glow discharge in a magnetic field at velocities M = 2 and 5 and a pressure of 0.6 Torr are given. It is shown that, depending on the polarization of the magnetic field induction vector, the magnetic field can both accelerate and slow down the motion of the discharge current column in gas flow. When there is no magnetic field, the normal glow discharge is not carried away by the flow, but moves at a noticeably lower velocity. This is a consequence of the influence of the gas boundary layers near the surfaces and a delay in the rate of ionization processes in the electric current column of gas-discharge plasma relative to the velocity of motion of the neutral gas that penetrates the discharge.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 5","pages":"1137 - 1153"},"PeriodicalIF":1.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108574","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
Kinematics of the First Wave Faraday Mode on the Side Wall of a Rectangular Vessel
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-11-12 DOI: 10.1134/S0015462824603802
V. A. Kalinichenko
{"title":"Kinematics of the First Wave Faraday Mode on the Side Wall of a Rectangular Vessel","authors":"V. A. Kalinichenko","doi":"10.1134/S0015462824603802","DOIUrl":"10.1134/S0015462824603802","url":null,"abstract":"<p>New results of experiments on studying the first Faraday wave mode on the surface of a shallow liquid in a rectangular vessel are given. For regular waves, resonance dependences were measured and the wave profiles were analyzed. It is shown that the presence of a moving local surface elevation in the form of a hump is associated with the nonlinearity of wave oscillations of liquid. A comparison is made with a theoretical model of nonlinear gravity waves. The mechanism of breaking the first Faraday wave mode consisting in the formation of a plane jet ejection on the side wall of the vessel as a result of focusing fluid flows in the growing crest and surface hump has been studied.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 5","pages":"1028 - 1037"},"PeriodicalIF":1.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108622","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
Structure of Swirling Flow in the Channel Branching Area at Moderate Reynolds Numbers
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-11-12 DOI: 10.1134/S0015462824602663
V. M. Molochnikov, I. V. Nikiforov, N. D. Pashkova
{"title":"Structure of Swirling Flow in the Channel Branching Area at Moderate Reynolds Numbers","authors":"V. M. Molochnikov,&nbsp;I. V. Nikiforov,&nbsp;N. D. Pashkova","doi":"10.1134/S0015462824602663","DOIUrl":"10.1134/S0015462824602663","url":null,"abstract":"<p>The results of experimental studies of steady-state swirling flow in the area of channel branching, that imitates the proximal end-to-side anastomosis of the human femoral artery, are given. The experiments were carried out at a Reynolds number of 1460. This corresponds to the range of physiological values when estimating by the maximum blood flow rate in the artery during the period of cardiac contractions. For both branches, an equal ratio of the flow rates was maintained. At the inlet to the branching area, the degree of flow swirl was equal to 0.125. Using the SIV (smoke image velocimetry) technique, flow was visualized and the instantaneous vector flow velocity fields of each branch were measured. The main patterns of the influence of swirl on the vortex structure of flow in the main artery below the branching area and in the shunt have been revealed. The possibility of using flow swirl to create more favorable hemodynamic conditions in the anastomotic area is being considered. A particular attention is paid to the appearance of signs of local flow turbulization in the presence and absence of swirl.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 5","pages":"1038 - 1055"},"PeriodicalIF":1.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108619","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
Instantaneous and Average Structure of a Supersonic Underexpanded Jet
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-11-12 DOI: 10.1134/S0015462824603012
V. I. Zapryagaev, I. N. Kavun, N. P. Kiselev, A. N. Kudryavtsev, A. A. Pivovarov, D. V. Khotyanovsky
{"title":"Instantaneous and Average Structure of a Supersonic Underexpanded Jet","authors":"V. I. Zapryagaev,&nbsp;I. N. Kavun,&nbsp;N. P. Kiselev,&nbsp;A. N. Kudryavtsev,&nbsp;A. A. Pivovarov,&nbsp;D. V. Khotyanovsky","doi":"10.1134/S0015462824603012","DOIUrl":"10.1134/S0015462824603012","url":null,"abstract":"<p>The instantaneous and average structure of a supersonic underexpanded jet is studied numerically and experimentally. The photos obtained in experiments with different exposure times and the Pitot pressure measurements are compared with the results of the numerical simulation performed using an implicit large-eddy method. We note that the jet flow instability, disturbance growth, and transition to turbulence lead to the situation, in which the instantaneous flow structure can be considerably different from the average structure. The flow pattern observable in the calculations is in good agreement with that presented in the experimental photos obtained with short exposure times. Both calculated and experimental data indicate that an important role in the jet flow dynamics is played by large-scale vortex structures that exist against the background of small-scale turbulence. The calculated and experimental Pitot pressure distributions are similar with each other, up to a certain distance from the nozzle exit section. Further downstream, the experimental and calculated Pitot pressures start to increase rapidly but the calculations predict the onset of this growth at a greater distance from the nozzle than it is observable in the experiments.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 5","pages":"1108 - 1116"},"PeriodicalIF":1.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108661","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
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信