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Some thermodynamic properties of SF6 on the binodal in the vicinity of the critical point 临界点附近双峰上SF6的一些热力学性质
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI: 10.1134/S0869864323030149
E. E. Ustyuzhanin, V. F. Ochkov, V. A. Rykov, S. V. Rykov, I. V. Kudryavtseva
{"title":"Some thermodynamic properties of SF6 on the binodal in the vicinity of the critical point","authors":"E. E. Ustyuzhanin,&nbsp;V. F. Ochkov,&nbsp;V. A. Rykov,&nbsp;S. V. Rykov,&nbsp;I. V. Kudryavtseva","doi":"10.1134/S0869864323030149","DOIUrl":"10.1134/S0869864323030149","url":null,"abstract":"<div><p>The presented paper considers a number of problems, with the first of them concerning the analysis of experimental (<i>ρ</i><sub>l</sub>, <i>ρ</i><sub>g</sub>, <i>T</i>)-data of SF<sub>6</sub> at relative temperatures (1.5·10<sup>−8</sup> &lt; <i>τ</i> &lt; 0.3). The second task is to develop combined models (<i>ρ</i><sub>l</sub> (<i>D</i>, <i>C</i>, <i>τ</i>), <i>ρ</i><sub>g</sub> (<i>D</i>, <i>C</i>, <i>τ</i>), …) that agree with a number of boundary conditions, including the requirements of the scale theory of critical phenomena. The third task deals with the calculation of (<i>D</i>, <i>C</i>)-parameters included in the combined models; at this stage, a basic array of (<i>ρ</i><sub>l</sub>, <i>ρ</i><sub>g</sub>, <i>T</i>)-data is formed. It contains: a) experimental results obtained in the laboratory of Prof. Funke (Germany) and b) (<i>ρ</i><sub>l</sub>, <i>ρ</i><sub>g</sub>, <i>T</i>)-data obtained by recalculating some values in the laboratory of Prof. Garrabos (France). The models <i>ρ</i><sub>l</sub> (<i>D</i>, <i>C</i>, <i>τ</i>) and <i>ρ</i><sub>g</sub> (<i>D</i>, <i>C</i>, <i>τ</i>) serve as the basis for computing some thermodynamic functions of SF<sub>6</sub> in the critical region; among them there are complexes, which consist of several properties (the average diameter of a binodal, the order parameter etc.).</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 3","pages":"557 - 573"},"PeriodicalIF":0.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910389","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 field in a well with casing induction heating: considering the natural convection influence 考虑自然对流影响的套管感应加热井内温度场
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI: 10.1134/S0869864323030083
R. Z. Akchurin, F. F. Davletshin, D. F. Islamov, R. A. Valiullin, R. F. Sharafutdinov
{"title":"Temperature field in a well with casing induction heating: considering the natural convection influence","authors":"R. Z. Akchurin,&nbsp;F. F. Davletshin,&nbsp;D. F. Islamov,&nbsp;R. A. Valiullin,&nbsp;R. F. Sharafutdinov","doi":"10.1134/S0869864323030083","DOIUrl":"10.1134/S0869864323030083","url":null,"abstract":"<div><p>One of the promising methods of geophysical research in operating wells is active thermometry. The method consists in creating an artificial temperature field in a well due to local heating of the metal casing. Observation of heat tags movement enables determining the fluid flow rate in the well and identifying the intervals of the behind casing flow.</p><p>The article is devoted to the study of non-stationary thermal processes in a well during induction heating. The calculations were performed in the commercial simulator Ansys Fluent. It was established that with an increase in the volumetric flow rate through the column from 5 to 50 m<sup>3</sup>/day for the modeling conditions, the maximum heating of the liquid (a change in the average mass cross-section temperature) is reduced by 85 %, and the maximum heating of the column is reduced by 7 %. The influence of natural convection on the formation of a temperature field in a liquid and a column has been studied. For the model with natural convection accounted, the column heats up significantly less than for the model without convection: the error in calculating the temperature changes due to neglect of natural convection can reach several hundred percent. During the process of induction heating for the casing, the effect of natural convection remains significant throughout the entire flow range of 5–50 m<sup>3</sup>/day.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 3","pages":"487 - 498"},"PeriodicalIF":0.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910512","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
Determination of the effect due wall interference on the flow around airfoil in the T-128 wind tunnel T-128风洞壁面干扰对翼型绕流影响的确定
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI: 10.1134/S086986432303006X
S. A. Glazkov, A. V. Semenov
{"title":"Determination of the effect due wall interference on the flow around airfoil in the T-128 wind tunnel","authors":"S. A. Glazkov,&nbsp;A. V. Semenov","doi":"10.1134/S086986432303006X","DOIUrl":"10.1134/S086986432303006X","url":null,"abstract":"<div><p>Within the framework of linear subsonic theory, the problem of determining the effect due to wall interference on the flow around airfoil according to the pressure distributions measured on the airfoil and on the wind-tunnel test section walls is solved. For the test case (testing a BGK1 airfoil in the IAR1.5m wind tunnel), we compared the wall interference corrections to freestream Mach number and airfoil angle-of-attack that were obtained using our method and in the works by other authors. For an OSPB-77 airfoil model tested in the T-128 wind tunnel for two values of wall permeability, <i>f</i> = 0 and 3 %, corrections to distributed data and integral loads were applied in the range of Mach numbers from 0.2 to 0.78. The application of those corrections has made it possible to bring the results for <i>f</i> = 0 and <i>f</i> = 3 % in closer agreement up to the angles of attack at which flow separation occurs on the airfoil.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 3","pages":"459 - 474"},"PeriodicalIF":0.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910508","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
Direct Monte Carlo simulation of subsonic evaporation into a half-space 半空间亚音速蒸发的直接蒙特卡罗模拟
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI: 10.1134/S0869864323030034
A. A. Morozov, E. Ya. Gatapova
{"title":"Direct Monte Carlo simulation of subsonic evaporation into a half-space","authors":"A. A. Morozov,&nbsp;E. Ya. Gatapova","doi":"10.1134/S0869864323030034","DOIUrl":"10.1134/S0869864323030034","url":null,"abstract":"<div><p>Modeling of processes with phase transition in confined spaces needs high-accuracy simulations with account for non-equilibrium. In the present paper, we use the direct simulation Monte Carlo method for describing evaporation into a vapor-filled half-space with a subsonic monoatomic gas flow. Two types of boundary conditions for open halfspace are considered: the iteration approach with consecutive calculation of temperature and pressure, and the approach with a fixed velocity. We compared these approaches for obtaining the accurate solution of the problem. The fixed-velocity approach provides a higher accuracy for the flow with a low Mach number. The calculated results are compared with a known solution of a model kinetic equation.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 3","pages":"417 - 427"},"PeriodicalIF":0.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910510","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
Study of gas and particle flow through a mask with round aperture during cold spraying 冷喷涂过程中圆孔面罩内气体和颗粒流动的研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI: 10.1134/S0869864323030113
S. V. Klinkov, V. F. Kosarev, S. Yu. Usynin, V. S. Shikalov
{"title":"Study of gas and particle flow through a mask with round aperture during cold spraying","authors":"S. V. Klinkov,&nbsp;V. F. Kosarev,&nbsp;S. Yu. Usynin,&nbsp;V. S. Shikalov","doi":"10.1134/S0869864323030113","DOIUrl":"10.1134/S0869864323030113","url":null,"abstract":"<div><p>The paper presents the results of simulation and experiment for motion of a supersonic two-phase jet passing through a round aperture in a mask. The mask is placed at different distances from the substrate under the conditions of the cold spraying. The calculations were performed using the fluid dynamics software ANSYS Fluent; flow visualization is achieved using the Schlieren method. Solution analysis and comparison of results were performed for example of aluminum powder spraying.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 3","pages":"525 - 537"},"PeriodicalIF":0.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910514","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
Caloric properties of the Mg2Ca intermetallic compound in solid and liquid states Mg2Ca金属间化合物在固态和液态下的热性能
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI: 10.1134/S0869864323030137
R. N. Abdullaev, A. R. Khairulin, A. Sh. Agazhanov
{"title":"Caloric properties of the Mg2Ca intermetallic compound in solid and liquid states","authors":"R. N. Abdullaev,&nbsp;A. R. Khairulin,&nbsp;A. Sh. Agazhanov","doi":"10.1134/S0869864323030137","DOIUrl":"10.1134/S0869864323030137","url":null,"abstract":"<div><p>The enthalpy and heat capacity of solid and liquid Mg<sub>2</sub>Ca intermetallic alloy were measured by massive high-temperature isothermal drop calorimeter over the temperature range of 298.15–1177 K. The estimated errors in the data on enthalpy and heat capacity were 0.2 % and 2 %, respectively. The fusion enthalpy of the Mg<sub>2</sub>Ca intermetallic alloy was determined to be 483 ± 3 J/g. The heat capacity of the Mg<sub>2</sub>Ca melt was shown to be constant in the range of 993.2–1177 K. A comparison of the obtained results with literature data has been carried out.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 3","pages":"553 - 556"},"PeriodicalIF":0.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910516","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 capacity of magnesium-calcium alloys in the solid state 镁钙合金的固态热容
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI: 10.1134/S0869864323030150
D. A. Samoshkin, R. N. Abdullaev, S. V. Stankus, A. Sh. Agazhanov
{"title":"Heat capacity of magnesium-calcium alloys in the solid state","authors":"D. A. Samoshkin,&nbsp;R. N. Abdullaev,&nbsp;S. V. Stankus,&nbsp;A. Sh. Agazhanov","doi":"10.1134/S0869864323030150","DOIUrl":"10.1134/S0869864323030150","url":null,"abstract":"<div><p>Using the method of differential scanning calorimetry, the heat capacity of Mg-Ca alloys containing 10.50, 33.34, and 73.00 at. % Ca, being promising for various practical applications (biocompatible and biodegradable alloys, ultralight construction materials, anode materials, hydrogen absorbent materials, etc.) has been studied experimentally. New reliable experimental results on the heat capacity in the temperature range of 190–576÷692 K of the solid state have been obtained. The estimated errors of the received data were 2–3 %. The reference table for temperature dependences of heat capacity of Mg-Ca alloys has been compiled. It has been established, that over a wide temperature range the heat capacity of solid magnesium-calcium alloys can be estimated with high accuracy using the Neumann–Kopp rule.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 3","pages":"575 - 580"},"PeriodicalIF":0.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910392","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
Analysis of factors determining numerical solution in the calculation of flow with combustion using the ONERA experimental model ONERA实验模型计算燃烧流数值解的影响因素分析
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI: 10.1134/S0869864323030101
W. Liu
{"title":"Analysis of factors determining numerical solution in the calculation of flow with combustion using the ONERA experimental model","authors":"W. Liu","doi":"10.1134/S0869864323030101","DOIUrl":"10.1134/S0869864323030101","url":null,"abstract":"<div><p>Three-dimensional numerical simulation of a transverse hydrogen jet blowing into a duct with a supersonic flow of air (warmed by a fire heater) has been carried out. The study is based on experimental data obtained at the ONERA-LAERTE facility. The RANS equations for the reacting gas were solved, closed by the SST model and various kinetic mechanisms of hydrogen combustion in air. The channel wall roughness was taken into account in this model. The dependence of the flow characteristics on such physical factors as the shape of the fuel injector channel, the effective roughness height, and various methods of describing molecular diffusion has been studied. It has been established that the equivalent diameter of a grain of sand has a significant influence on the longitudinal pressure distribution in the duct. The influence of chemical kinetics on the flow structure in separation zones within the duct is demonstrated.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 3","pages":"507 - 523"},"PeriodicalIF":0.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910513","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: 1
Effect of initiating additives on phenol oxidation in water–oxygen fluid 引发剂对苯酚在水-氧流体中氧化的影响
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI: 10.1134/S0869864323030125
A. V. Shishkin, S. A. Alekhin, M. Ya. Sokol
{"title":"Effect of initiating additives on phenol oxidation in water–oxygen fluid","authors":"A. V. Shishkin,&nbsp;S. A. Alekhin,&nbsp;M. Ya. Sokol","doi":"10.1134/S0869864323030125","DOIUrl":"10.1134/S0869864323030125","url":null,"abstract":"<div><p>Phenol oxidation in a water-oxygen fluid in a tubular batch reactor with its uniform heating (1 °C/min) to 600 °C was studied. An increase in the amount of O<sub>2</sub> above the stoichiometric ratio by 25 % leads to an increase in the degree of carbon burnout by the factor of 1.09. Replacing 10 % of the stoichiometric amount of oxygen with nitrous oxide leads to the same increase in the degree of carbon burnout, primarily due to its afterburning at a temperature of ≥ 400 °C. Replacement of some part of phenol with isopropanol leads to an increase in the degree of carbon burnout by the factor of 1.02. It was established for the first time that the heterogeneous mechanism of phenol oxidation in a water-oxygen fluid is the main one. However, the overstoichiometric amount of O<sub>2</sub>, as well as the addition of N<sub>2</sub>O and isopropanol intensifies gas-phase combustion of carbon. A catalytic effect of a Pt-Rh/Pt-thermocouple on the degree of phenol conversion in the presence of O<sub>2</sub> at temperatures above 135 °C was found.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 3","pages":"539 - 552"},"PeriodicalIF":0.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910515","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
Numerical study of the influence of bichannel-system geometry on the existence domain of Hartmann effect 双通道系统几何对Hartmann效应存在域影响的数值研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI: 10.1134/S0869864323030022
A. A. Zhilin, A. V. Primakov
{"title":"Numerical study of the influence of bichannel-system geometry on the existence domain of Hartmann effect","authors":"A. A. Zhilin,&nbsp;A. V. Primakov","doi":"10.1134/S0869864323030022","DOIUrl":"10.1134/S0869864323030022","url":null,"abstract":"<div><p>The present numerical study is aimed at revealing the influence of the nozzle exit-to-resonator edge distance on the gas-dynamic characteristics of the acoustic-convective flow in the flow path of a bichannel system. The aim of the work is the development of a computational technology for describing physical processes in the duct of multichannel systems that generate high-intensity acoustic fields. Five configurations of the bichannel system in which the gap between the nozzle exit and the resonator edge was 0.85, 1.10, 1.35, 1.60, and 1.85 of the resonator diameter, were analyzed. As a result of the study, a complete picture of the gas-dynamic flow formed in the duct of the bichannel system was obtained, including the resonating cavity and the region in between the nozzle and resonator. With the help of numerical simulation, the formation of a flow with high-frequency, low-amplitude oscillations at a small gap between the nozzle exit and the resonator edge, which was observed in experiments, has been demonstrated. Pure-tone oscillations with maximum intensity occur when the resonator is placed in the region of the beginning of the second barrel, this observation being in good agreement with the data obtained by other authors. Subsequent increase in the nozzle-to-resonator distance leads to the emergence of subharmonics and multiple harmonics. Verification of gained numerical results with available experimental data is carried out.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 3","pages":"403 - 416"},"PeriodicalIF":0.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910504","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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