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LDA-Based Experimental Investigation of Velocity Pulsations in the Vortex Tube 基于 LDA 的涡管速度脉动实验研究
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030032
I. K. Kabardin, N. I. Yavorsky, M. Kh. Pravdina, M. R. Gordienko, S. V. Kakaulin, K. S. Zubanov, G. V. Bakakin, V. G. Meledin
{"title":"LDA-Based Experimental Investigation of Velocity Pulsations in the Vortex Tube","authors":"I. K. Kabardin,&nbsp;N. I. Yavorsky,&nbsp;M. Kh. Pravdina,&nbsp;M. R. Gordienko,&nbsp;S. V. Kakaulin,&nbsp;K. S. Zubanov,&nbsp;G. V. Bakakin,&nbsp;V. G. Meledin","doi":"10.1134/S1810232824030032","DOIUrl":"10.1134/S1810232824030032","url":null,"abstract":"<p>Detailed experimental data on the kinematic characteristics of the flow in a vortex tube along its entire length are presented and analyzed. Experimental data obtained in a vortex tube with square cross-section of the working channel were compared at three values of the cold mass fraction: 0.4, 0.5, and 0.75 with the air expansion ratio in the apparatus of <span>(pi=5)</span>. The behavior of standard deviations from the mean values of velocity components is analyzed. The noticeable peaks in the percentage of standard deviation from the longitudinal mean velocity component are observed in the area of the near wall flow temperature growth along the tube.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"478 - 484"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250317","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
Investigation of the Local Equilibrium Approximation in a Planar Momentumless Turbulent Wake in a Passively Stratified Fluid 被动分层流体中平面无动量湍流漩涡的局部平衡近似研究
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030056
V. N. Grebenev, A. G. Demenkov, G. G. Chernykh
{"title":"Investigation of the Local Equilibrium Approximation in a Planar Momentumless Turbulent Wake in a Passively Stratified Fluid","authors":"V. N. Grebenev,&nbsp;A. G. Demenkov,&nbsp;G. G. Chernykh","doi":"10.1134/S1810232824030056","DOIUrl":"10.1134/S1810232824030056","url":null,"abstract":"<p>The flow in the far planar momentumless turbulent wake in a passively stratified medium is investigated with the use of a mathematical model that includes, along with the averaged equation for transfer of the longitudinal component of velocity, the differential equations for balance of the turbulence energy <span>(e)</span>, transfer of its dissipation rate <span>(varepsilon)</span>, fluid density defect <span>(langlerho_{1}rangle)</span>, shear turbulent stress <span>(langle{u}'{v}'rangle)</span>, and vertical component of the mass flux vector <span>(langle v'rho'rangle)</span> in the far wake approximation. Algebraic truncation of the last two equations leads to the known gradient relations for the shear turbulent stress and the vertical component of the mass flux vector. It has been established that with a certain limitation on the values of the empirical constants of the mathematical model and with a time scale growth law consistent with the mathematical model, these relations are joint differential constraints of the model. It has been found that the local equilibrium approximation for the shear turbulent stress is equivalent to the equality to zero of the Poisson bracket for dimensionless values of the turbulent viscosity coefficient and the defect of the longitudinal velocity component. It has been obtained that the local equilibrium approximation for the vertical component of the mass flux vector is equivalent to the equality to zero of the Poisson bracket for dimensionless values of the turbulent diffusion coefficient and mean density. Results of numerical experiments illustrating the theoretical results are presented.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"494 - 506"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250319","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 Characteristics of Activated Carbon Produced from Pine Nut Shells by Pyrolysis Technology Followed by Steam-Gas Activation 用热解技术生产松果壳活性炭并进行蒸汽-气体活化的特性实验研究
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S181023282403007X
A. V. Kuznetsov, E. Yu. Shadrin
{"title":"Experimental Study of Characteristics of Activated Carbon Produced from Pine Nut Shells by Pyrolysis Technology Followed by Steam-Gas Activation","authors":"A. V. Kuznetsov,&nbsp;E. Yu. Shadrin","doi":"10.1134/S181023282403007X","DOIUrl":"10.1134/S181023282403007X","url":null,"abstract":"<p>A method for activated carbon production from pine nut shells by pyrolysis technology followed by steam-gas activation is considered. The process of thermal decomposition of sample in an inert environment was studied; the main stages of the process were identified; the residual mass was determined. The iodine adsorption activity, total pore volume, mass fraction of moisture, mass fraction of ash, and specific surface area were found. The experiments have shown that the production technology is efficient and the raw material is promising for activated carbon production.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"516 - 520"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250320","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
An Effect of Mass Transpiration and Darcy–Brinkman Model on Ostwald–de Waele Ternary Nanofluid 质量蒸发和达西-布林克曼模型对 Ostwald-de Waele 三元纳米流体的影响
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S181023282403010X
U. S. Mahabaleshwar, S. M. Sachhin, L. M. Pérez, G. Lorenzini
{"title":"An Effect of Mass Transpiration and Darcy–Brinkman Model on Ostwald–de Waele Ternary Nanofluid","authors":"U. S. Mahabaleshwar,&nbsp;S. M. Sachhin,&nbsp;L. M. Pérez,&nbsp;G. Lorenzini","doi":"10.1134/S181023282403010X","DOIUrl":"10.1134/S181023282403010X","url":null,"abstract":"<p>This article studies the flow of Ostwald–de Waele ternary nanofluid over a permeable shrinking sheet. The governing partial differential equations are converted into ordinary differential equations using similarity variables and solved analytically. The article includes closed-form algebraic solutions and graphical flow dynamics analysis, dependent on Darcy number, volume fraction, and mass transpiration. The study shows that the presence of porous media significantly upsurges the mass transpiration and magnitude of skin friction. The calculation uses a combination of Titanium dioxide (TiO<sub>2</sub>), Cobalt ferrite (CoFe<span>(_{2}O_{4})</span>), and Magnesium oxide (MgO) nanoparticles in pure water, and the ternary nanofluid performs better than the conventional fluid in terms of thermal conductivity. This is important in the fields of manufacturing, machine operations, and engineering, where improving heat transfer is crucial.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"547 - 565"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250329","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
Phase Equilibrium for Hydrofluorocarbon R134a Hydrate. Hydrate-Based Desalination of NaCl Salt Solution 氢氟碳化合物 R134a 水合物的相平衡。基于水合物的氯化钠盐溶液脱盐
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030172
A. V. Meleshkin, A. K. Sagidullin, S. Y. Misyura, V. S. Morozov, N. V. Marasanov, V. V. Glezer, M. Sh. Madygulov, M. T. Mito
{"title":"Phase Equilibrium for Hydrofluorocarbon R134a Hydrate. Hydrate-Based Desalination of NaCl Salt Solution","authors":"A. V. Meleshkin,&nbsp;A. K. Sagidullin,&nbsp;S. Y. Misyura,&nbsp;V. S. Morozov,&nbsp;N. V. Marasanov,&nbsp;V. V. Glezer,&nbsp;M. Sh. Madygulov,&nbsp;M. T. Mito","doi":"10.1134/S1810232824030172","DOIUrl":"10.1134/S1810232824030172","url":null,"abstract":"<p>Experimental dependences (pressure-temperature) of phase equilibrium of hydrofluorocarbon R134a hydrate have been obtained in aqueous solution of the NaCl salt. The measurements were carried out at a salt concentration in water of 3.25 wt. % in the pressure range from 0.5 to 2.5 bar at temperatures varying from −3 to 10°C. In contrast with the pure water system, the presence of salt in the solution had an inhibitory effect. The equilibrium temperature on the equilibrium curve of R134a hydrate at a set pressure decreased by 12–25%, unlike the temperature for the system with pure water. Combined washing process followed by centrifugation decreased the mass concentration of the salt in the solution by 92% compared to the initial salt concentration.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"652 - 662"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250331","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 Inclination Angle on Wall Shear Stress in Upward Two-Phase Flow in a Pipe 倾角对管道中向上两相流的壁面剪应力的影响
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030068
O. N. Kashinsky, A. S. Kurdyumov, A. E. Gorelikova
{"title":"Effect of Inclination Angle on Wall Shear Stress in Upward Two-Phase Flow in a Pipe","authors":"O. N. Kashinsky,&nbsp;A. S. Kurdyumov,&nbsp;A. E. Gorelikova","doi":"10.1134/S1810232824030068","DOIUrl":"10.1134/S1810232824030068","url":null,"abstract":"<p>An experimental study of gas liquid flow in an inclined circular pipe was performed. Experiments were performed for two values of superficial liquid velocities and different gas flow rates. The angle of pipe inclination varies from 10° to 80° with respect to horizontal position. Wall shear stress was measured in the apex point of the pipe using an electrodiffusional technique. A strong effect of pipe inclination on wall shear stress was shown. The highest values of wall shear stress corresponded to the angles of 40° to 60°. A significant increase of wall shear stress at low gas flow rates was detected.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"507 - 515"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250323","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
Laser Doppler Anemometry of Cavitating Hydrofoil in a Slit 狭缝中气蚀水翼的激光多普勒风速测量法
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030160
A. Yu. Kravtsova, D. V. Kulikov, D. A. Lanshakov, M. V. Kashkarova, S. V. Dvoinishnikov
{"title":"Laser Doppler Anemometry of Cavitating Hydrofoil in a Slit","authors":"A. Yu. Kravtsova,&nbsp;D. V. Kulikov,&nbsp;D. A. Lanshakov,&nbsp;M. V. Kashkarova,&nbsp;S. V. Dvoinishnikov","doi":"10.1134/S1810232824030160","DOIUrl":"10.1134/S1810232824030160","url":null,"abstract":"<p>Laser Doppler anemometry (LDA) is one of the main non-contact methods for measuring the velocity characteristics of flows and pressure pulsations. Determining the quantitative patterns of the flow of multiphase liquids in small-sized channels is known to be a difficult task. The authors demonstrate the eventual use of LDA to study cavitation flows in slits with a height of 1.2 mm. The cavitation flow is created by means of the NACA0012 hydrofoil. The experimental equipment is positioned using a micro-displacement device. The distortion of the luminous flux through the channel walls is taken into account. This paper presents an algorithm for searching the central region of the slit. A method for filtering noise effects is described. The results of measuring the average flow velocity near the cavitating hydrofoil in the slit are provided in the article.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"646 - 651"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268158","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 Local Heat Supply into Supersonic Incoming Flow Ahead of Thin Body with Disk on Intensity of Weak Far-Field Shock Waves 带盘薄体前方超音速入流的局部供热对弱远场冲击波强度的影响
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030111
A. V. Potapkin, D. Yu. Moskvichev
{"title":"Effect of Local Heat Supply into Supersonic Incoming Flow Ahead of Thin Body with Disk on Intensity of Weak Far-Field Shock Waves","authors":"A. V. Potapkin,&nbsp;D. Yu. Moskvichev","doi":"10.1134/S1810232824030111","DOIUrl":"10.1134/S1810232824030111","url":null,"abstract":"<p>The possibility of reducing the intensity of shock waves from a body going supersonic in the atmosphere was investigated. Parameters of near- and far-field shock waves from a thin body with a disk located ahead of the body across the incoming flow at local heating of the incoming flow were calculated. The Mach number of the incoming cold air flow was 2. The calculations were performed by the combined “phantom body” method. The calculation results show that simultaneous use of an aerodynamic surface ahead of the body and heating of the incoming flow makes it possible to reduce the intensity of far-field shock waves by approximately 30%.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"566 - 575"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250325","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
Mg–Li–Ca Eutectic Alloy. Phase Transitions and Thermophysical Properties 镁-锂-钙共晶合金。相变和热物理性质
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030184
R. N. Abdullaev, A. Sh. Agazhanov, R. A. Khairulin, Yu. M. Kozlovskii, D. A. Samoshkin, S. V. Stankus
{"title":"Mg–Li–Ca Eutectic Alloy. Phase Transitions and Thermophysical Properties","authors":"R. N. Abdullaev,&nbsp;A. Sh. Agazhanov,&nbsp;R. A. Khairulin,&nbsp;Yu. M. Kozlovskii,&nbsp;D. A. Samoshkin,&nbsp;S. V. Stankus","doi":"10.1134/S1810232824030184","DOIUrl":"10.1134/S1810232824030184","url":null,"abstract":"<p>A homogeneous eutectic alloy of the magnesium-lithium-calcium ternary system containing 72.5 at.% magnesium, 19.1 at.% lithium, and 8.4 at.% calcium was prepared. Experimental studies of the relative elongation, density, thermal expansion, heat capacity, thermal diffusivity and thermal conductivity of this ultralight alloy were performed in the temperature range of 120 K to 710 K. The behavior of density and thermal expansion in the melting-crystallization region and in the liquid state was also studied. A comparison with previously obtained results on the thermophysical properties of pure magnesium and magnesium-lithium, magnesium-calcium eutectic alloys was made. The temperature dependences were constructed and the table of the investigated properties recommended values were presented. It was found that in the Mg–Li–Ca alloy a phase transition occurs in the range of 225 K to 245 K, where the heat capacity and the linear thermal expansion coefficient change abruptly. This kind of transition was found earlier in the study of the Mg–Li eutectic alloy and is presumably related to the martensitic transformation of the lithium-rich bcc magnesium-lithium alloys to the hcp structure.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"663 - 674"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250333","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
Hysteresis Phenomena at Boiling in Liquid Film Flowing down the Tubes with Microarc Oxidation Coating 带微弧氧化涂层的液膜流下管时的沸腾滞后现象
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030019
A. N. Pavlenko, A. I. Kataev, I. B. Mironova
{"title":"Hysteresis Phenomena at Boiling in Liquid Film Flowing down the Tubes with Microarc Oxidation Coating","authors":"A. N. Pavlenko,&nbsp;A. I. Kataev,&nbsp;I. B. Mironova","doi":"10.1134/S1810232824030019","DOIUrl":"10.1134/S1810232824030019","url":null,"abstract":"<p>A study of heat transfer at evaporation and boiling in liquid film flowing down the horizontal tube bundle in tube-and-shell evaporator is reported. This bundle includes duralumin tubes with micro-arc oxidizing (MAO) treatment, which heat transfer characteristics are the subject of conducted tests. Refrigerant R21 at the pressure of <span>(sim)</span>3 bar of absolute pressure is used as working liquid. Hot water pumped through bundle tubes used as a heat carrier. The boiling curves obtained for the tested tubes with MAO treatment showed considerable heat transfer enhancement in comparison with plain tube; however, hysteresis phenomena due to a porous structure of micro-arc oxidizing coatings are revealed. These phenomena should be taken into account at operating heat transfer equipment.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"445 - 466"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250318","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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