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Determination of droplet sizes in a gas-droplet outflow from a microchannel nozzle device 从微通道喷嘴装置流出的气滴中液滴大小的测定
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-27 DOI: 10.1134/S0869864325060058
E. Ya. Gatapova, M. N. Ryabov
{"title":"Determination of droplet sizes in a gas-droplet outflow from a microchannel nozzle device","authors":"E. Ya. Gatapova,&nbsp;M. N. Ryabov","doi":"10.1134/S0869864325060058","DOIUrl":"10.1134/S0869864325060058","url":null,"abstract":"<div><p>To generate a spray flow in confined spaces, it is necessary to develop specialized nozzles capable of dispersing micron- and submicron-sized droplets at the nozzle edge. A high-speed visualization of a gas-droplet flow from a specially manufactured microchannel nozzle device with a resolution of 2.5 µm/pixel was performed, allowing for the determination of sizes of the dispersed droplets. The nozzle was a specially fabricated device composed of a 243 µm-thick microchannel silicon membrane and a microchannel size of 10 × 10 µm<sup>2</sup>. The characteristic sizes and velocities of the dispersed droplets were measured at low liquid flow rates (0.05–2 ml/min) and air pressure drops from 1 to 6 atm. At a HFE-7100 flow rate of 1 ml/min and an air pressure drop of 1 atm, the average droplet size was approximately 40 µm, while at a flow rate of 2 ml/min and a pressure drop of 2 atm, it was 20 µm. A substantial increase in velocity was observed with increasing pressure drop. At the minimum flow rate, the dispersion of very small droplets was observed, which were not detected at a resolution of 2.5 µm/pixel. However, the overall flow was clearly visible as a “mist”.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 6","pages":"1241 - 1247"},"PeriodicalIF":0.5,"publicationDate":"2026-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323854","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
Separated flow over a swept wing: role of fuselage and elevons 后掠翼上的分离气流：机身和副翼的作用
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-27 DOI: 10.1134/S0869864325060046
A. M. Pavlenko, N. S. Alpatsky, B. Yu. Zanin, E. M. Dubovitsky
{"title":"Separated flow over a swept wing: role of fuselage and elevons","authors":"A. M. Pavlenko,&nbsp;N. S. Alpatsky,&nbsp;B. Yu. Zanin,&nbsp;E. M. Dubovitsky","doi":"10.1134/S0869864325060046","DOIUrl":"10.1134/S0869864325060046","url":null,"abstract":"<div><p>The paper presents the results of a study on the influence of a fuselage and controls displacement on the separated flow types. These flow types are generated in a flow past a swept-shaped leading edge of a wing; the experiments are conducted for a subsonic stream in a wind tunnel. This paper is a continuation of an experimental series on separated flows and control of aircraft wing at low Reynolds numbers. The well-instrumented methods for flow visualization and hot-wire anemometry were applied for gaining the experimental data. This provides a comprehensive understanding of the generated separated flows on the windward side of a wing at different attack angles and different aircraft control operations. The issue of control over a separated flow has been studied. The global flow separation can be eliminated through a local impact in selected points.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 6","pages":"1225 - 1240"},"PeriodicalIF":0.5,"publicationDate":"2026-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323913","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 dissipative properties of oscillating bubbles in water 水中振荡气泡耗散特性的实验研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-27 DOI: 10.1134/S0869864325060022
G. I. Pavlov, F. A. Zaripov, P. V. Nakoryakov, N. Yu. Kozharin
{"title":"Experimental investigation of dissipative properties of oscillating bubbles in water","authors":"G. I. Pavlov,&nbsp;F. A. Zaripov,&nbsp;P. V. Nakoryakov,&nbsp;N. Yu. Kozharin","doi":"10.1134/S0869864325060022","DOIUrl":"10.1134/S0869864325060022","url":null,"abstract":"<div><p>This paper examines interaction of propagating waves with gas bubbles contained in liquid and the behavior of gas bubbles in a gas-liquid mixture. A description of the experimental setup for studying the influence of a propagating wave on gas bubbles is presented and the observed phenomena are described.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 6","pages":"1195 - 1204"},"PeriodicalIF":0.5,"publicationDate":"2026-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323914","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
Relaxation of turbulent energy during gas flow into a vacuum 气体进入真空时湍流能量的松弛
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-27 DOI: 10.1134/S0869864325060162
S. A. Novopashin, V. V. Kalyada
{"title":"Relaxation of turbulent energy during gas flow into a vacuum","authors":"S. A. Novopashin,&nbsp;V. V. Kalyada","doi":"10.1134/S0869864325060162","DOIUrl":"10.1134/S0869864325060162","url":null,"abstract":"<div><p>Experimental results on the temperature distribution in a jet of nitrogen flowing from a long pipe into a vacuum under laminar and turbulent flow conditions are presented. A temperature increase downstream was observed under turbulent flow conditions compared to laminar flow conditions. It is concluded that the temperature increase is associated with the turbulent energy relaxation.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 6","pages":"1333 - 1337"},"PeriodicalIF":0.5,"publicationDate":"2026-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323866","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
Types and properties of local secondary instabilities of a swept-wing boundary layer 后掠翼边界层局部二次不稳定性的类型与性质
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-09 DOI: 10.1134/S0869864325050014
V. I. Borodulin, A. V. Ivanov, Y. S. Kachanov, D. A. Mischenko
{"title":"Types and properties of local secondary instabilities of a swept-wing boundary layer","authors":"V. I. Borodulin,&nbsp;A. V. Ivanov,&nbsp;Y. S. Kachanov,&nbsp;D. A. Mischenko","doi":"10.1134/S0869864325050014","DOIUrl":"10.1134/S0869864325050014","url":null,"abstract":"<div><p>An experimental study of the primary and secondary unsteady instability of a swept-wing boundary layer is carried out under conditions of predominance of the primary cross-flow instability in presence of a localized three-dimensional roughness element of the surface. The measurements were carried out by a hot wire in a low-turbulence wind tunnel at a low subsonic incident-flow velocity under conditions of uncontrolled (“natural”) unsteady perturbations. Four types of amplified unsteady boundary-layer disturbances have been found and studied in detail: (i) low-frequency one, associated with primary flow instability, (ii) medium-frequency one (type III of secondary instability), and high-frequency ones, of types I (iii) and II (iv) secondary instabilities. The properties of these disturbances have been studied in detail and an analysis of positions and shapes of regions of their localization (in the wall-normal and flow-normal plane) with respect to the high-shear layers of the streamwise component of mean-flow velocity in spanwise and wall-normal directions have been performed. A complicated nature of the secondary disturbances is shown. This nature is difficult to explain by means of simplified concepts about the existence of the <i>z</i>- and <i>y</i>-modes of secondary instability proposed in previous studies.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 5","pages":"1003 - 1028"},"PeriodicalIF":0.6,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148196343","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
Heat transfer control in a separated flow behind a backward-facing step using tabs of various shapes 热传递控制在一个独立的流动背后的一个向后的台阶使用各种形状的标签
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-09 DOI: 10.1134/S0869864325050099
V. I. Terekhov, A. Yu. Dyachenko, Ya. J. Smulsky
{"title":"Heat transfer control in a separated flow behind a backward-facing step using tabs of various shapes","authors":"V. I. Terekhov,&nbsp;A. Yu. Dyachenko,&nbsp;Ya. J. Smulsky","doi":"10.1134/S0869864325050099","DOIUrl":"10.1134/S0869864325050099","url":null,"abstract":"<div><p>The results of an experimental study of the influence of tabs (teeth) of various shapes on the intensity of turbulent heat transfer in the separation zone in the near wake of a backward-facing step are presented. In this stagnation region, a significant decrease in heat transfer is observed, which negatively affects the thermal-hydraulic efficiency. Five tab shapes were studied in the experiments: square, triangular, cylindrical, semi-cylindrical and semi-conical ones. The tabs were installed at the step edge immediately before flow separation. Measurements were conducted at Reynolds number Re<sub><i>H</i></sub> = 4000 and varying tab pitch. It was found that square tabs with a pitch of 2.5 calibers (step height) have the greatest effect on flow and heat transfer, but at the same time, they cause the greatest hydraulic resistance, therefore, their thermal-hydraulic efficiency is lowest. Semi-conical tabs installed with a pitch of five calibers showed the best results.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 5","pages":"1119 - 1128"},"PeriodicalIF":0.6,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148196301","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
Three-dimensional flow structure in a narrow gap of a peripheral subchannel model of a fuel assembly: time-resolved tomographic velocity measurements 燃料组件外围子通道模型窄间隙中的三维流动结构：时间分辨层析速度测量
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-09 DOI: 10.1134/S0869864325050142
M. V. Shestakov
{"title":"Three-dimensional flow structure in a narrow gap of a peripheral subchannel model of a fuel assembly: time-resolved tomographic velocity measurements","authors":"M. V. Shestakov","doi":"10.1134/S0869864325050142","DOIUrl":"10.1134/S0869864325050142","url":null,"abstract":"<div><p>The three-dimensional flow structure in narrow gaps between the rods of nuclear fuel assemblies (FAs) has a decisive impact on the heat and mass transfer coefficients, which, in turn, govern the FA performance. In this study, instantaneous three-dimensional velocity fields in a peripheral subchannel model of a fuel assembly were measured for the first time using time-resolved tomographic particle image velocimetry (TR-Tomo PIV). The experiments were performed at Reynolds number Re = 2100. The TR-Tomo PIV measurements enabled characterization of the three-dimensional flow structure and dynamics in a narrow gap of the peripheral subchannel. Based on the obtained data, the vorticity vector components were evaluated throughout the entire flow volume. It is shown that the key mechanisms, responsible for generating extreme values of streamwise vorticity, are the transverse flow oscillations. These oscillations are quasi-periodic (Sh = 0.091) and alternate with stabilization phases, characterized by a straight-through flow.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 5","pages":"1169 - 1173"},"PeriodicalIF":0.6,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148196296","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
Diffraction phenomena upon incidence of a pair of weak shock waves on the leading edge of a flat plate model at supersonic freestream velocities 在超音速自由流速度下一对弱激波在平板模型前缘入射时的衍射现象
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-09 DOI: 10.1134/S0869864325050038
L. V. Afanasev, A. A. Yatskikh, A. D. Kosinov, Yu. G. Ermolaev, E. D. Karlova
{"title":"Diffraction phenomena upon incidence of a pair of weak shock waves on the leading edge of a flat plate model at supersonic freestream velocities","authors":"L. V. Afanasev,&nbsp;A. A. Yatskikh,&nbsp;A. D. Kosinov,&nbsp;Yu. G. Ermolaev,&nbsp;E. D. Karlova","doi":"10.1134/S0869864325050038","DOIUrl":"10.1134/S0869864325050038","url":null,"abstract":"<div><p>Results are presented of hot-wire measurements of the freestream and the boundary layer on a flat plate with a blunt leading edge in the presence of an N-wave as a disturbance source. Based on the measurements, estimates of cross-correlation characteristics were obtained. From the distribution of mutual phases, conclusions were drawn regarding the presence of diffraction phenomena of freestream pulsations. It is shown that, in contrast to the case of a sharp leading edge, the presence of diffraction phenomena cannot be reliably determined for a blunt leading edge.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 5","pages":"1045 - 1055"},"PeriodicalIF":0.6,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148196298","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
Comparative analysis of flow structure in an axisymmetric vortex chamber using the URANS approach and DNS 利用URANS方法和DNS对轴对称涡室流动结构进行对比分析
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-09 DOI: 10.1134/S0869864325050129
N. P. Skibina, V. V. Terekhov, V. I. Terekhov
{"title":"Comparative analysis of flow structure in an axisymmetric vortex chamber using the URANS approach and DNS","authors":"N. P. Skibina,&nbsp;V. V. Terekhov,&nbsp;V. I. Terekhov","doi":"10.1134/S0869864325050129","DOIUrl":"10.1134/S0869864325050129","url":null,"abstract":"<div><p>A numerical study of the flow in a swirl (tangential) vortex chamber using Direct Numerical Simulation (DNS) and Unsteady Reynolds-averaged Navier–Stokes (URANS) approaches is presented. The three-dimensional flow of a viscous incompressible gas (air) is considered at Reynolds number Re = 3.4·10<sup>4</sup>. The distributions of the axial and tangential velocity components, as well as their fluctuations, are analyzed. It is established that the DNS results provide a distribution of parameters in a swirling flow close to the experimental data, whereas turbulence models based on the Boussinesq hypothesis fail to reproduce the dynamics of a confined swirling flow numerically.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 5","pages":"1147 - 1161"},"PeriodicalIF":0.6,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148196351","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
Periodicity of the emissivity of V period metals in the region of melting temperatures V周期金属在熔化温度范围内发射率的周期性
IF 0.6 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-09 DOI: 10.1134/S0869864325050075
D. V. Kosenkov, V. V. Sagadeev
{"title":"Periodicity of the emissivity of V period metals in the region of melting temperatures","authors":"D. V. Kosenkov,&nbsp;V. V. Sagadeev","doi":"10.1134/S0869864325050075","DOIUrl":"10.1134/S0869864325050075","url":null,"abstract":"<div><p>This paper considers a relation between the emissivity of metals from the V period in Periodic Table while melting process with thermophysical properties surface tension coefficient (<i>γ</i>) and specific heat capacity (<i>C</i><sub><i>p</i></sub>). Taking the produced and available experimental data and using the theoretical calculation within Foot’s approximation, we elucidated the laws for emissivity as a function of electronic stricture and interatomic interaction. It was demonstrated that a correlation between the emissivity and parameters <i>γ</i> and <i>C</i><sub><i>p</i></sub> has a complicated behavior and this is dictated by general trends (emissivity increases with <i>γ</i>) and by a specific electronic configuration for the given elements. The results underline the importance of considering the periodicity and electronic configuration in forecasting the thermophysical properties of metals in the phase-transition state.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 5","pages":"1101 - 1111"},"PeriodicalIF":0.6,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148196299","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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