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A Study of the Surface Structure of Electrodes during Discharge in an Electrolyte in a Magnetic Field 磁场中电解质放电时电极表面结构的研究
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030094
D. L. Kirko
{"title":"A Study of the Surface Structure of Electrodes during Discharge in an Electrolyte in a Magnetic Field","authors":"D. L. Kirko","doi":"10.1134/s0018151x23030094","DOIUrl":"https://doi.org/10.1134/s0018151x23030094","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The occurrence of microstructures on the surface of tungsten and titanium electrodes during discharge in an electrolyte in the presence of a magnetic field has been studied. Electrical characteristics of the discharge at various modes were obtained. The plasma temperature in the near-electrode region was measured using spectral methods. Conical and pointed formations with sizes up to 10 µm occurred on tungsten electrodes. The appearance of microspheres and porous surfaces was observed on titanium electrodes. The growth of these surface structures accelerated and their characteristics improved under the effect of a magnetic field. The mechanism of growth of the observed microstructures are discussed.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140129747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Calculation of the Thermodynamic Properties of Methane up to 30 MPa Using a New Equation of State with Regular and Scale Parts and Few Constants 使用带有常规和比例部分以及少量常数的新状态方程计算 30 兆帕斯卡以下甲烷的热力学性质
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23020037
P. P. Bezverkhii, O. S. Dutova
{"title":"Calculation of the Thermodynamic Properties of Methane up to 30 MPa Using a New Equation of State with Regular and Scale Parts and Few Constants","authors":"P. P. Bezverkhii, O. S. Dutova","doi":"10.1134/s0018151x23020037","DOIUrl":"https://doi.org/10.1134/s0018151x23020037","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The heat capacities <span>({{C}_{v}})</span>, <i>C</i><sub><i>p</i></sub> and speed of sound <i>W</i> of methane were calculated by a new equation of state with few adjustable constants. The equation includes a new regular part with 13 coefficients and a scale part with 6 coefficients with a regular crossover function containing two fitting parameters. The constants in the equation of state were determined using only (<i>p</i>, ρ, <i>T</i>) data for СH<sub>4</sub>; no data on <span>({{C}_{v}})</span>, <i>C</i><sub><i>p</i></sub>, and <i>W</i> were employed, except for the data on isochoric heat capacity <span>({{C}_{v}})</span> in the ideal-gas state and value of <span>({{C}_{v}})</span> at 100 K on the liquid branch on the liquid–vapor equilibrium curve. The calculated values of <span>({{C}_{v}})</span>, <i>C</i><sub><i>p</i></sub>, and <i>W</i> are close to the experimental and tabulated values in the regular region. Calculations in the critical region uses universal critical indices α, β, γ according to the three-dimensional Ising model. A discrepancy with the tabulated data is caused by application of the scaling equation of state. The calculated values are compared with the predictions by the known crossover equations of state for СH<sub>4</sub>. The root-mean-square error in the description of СH<sub>4</sub> pressure is σ<sub><i>р</i></sub> = 0.5%, the mean absolute deviation is 0.3%, the uncertainty in <span>({{C}_{v}})</span> does not exceed 5%.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Process of Heat Transfer in a Coal Bed with Variation Thermophysical Properties 热物理性质变化的煤层传热过程
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030069
I. M. Abdulagatov, A. E. Ramazanova
{"title":"The Process of Heat Transfer in a Coal Bed with Variation Thermophysical Properties","authors":"I. M. Abdulagatov, A. E. Ramazanova","doi":"10.1134/s0018151x23030069","DOIUrl":"https://doi.org/10.1134/s0018151x23030069","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>New experimental thermodynamically consistent data are presented on the temperature dependence of thermal diffusivity, heat capacity, and thermal conductivity (λ = <i>a</i>ρ<i>C</i><sub><i>p</i></sub>) of black coal calculated on their basis. The effect of the thermal decomposition (pyrolysis) of coal near 700 K and evaporation of moisture and other easily volatile components of coal at 380 K on the behavior of heat capacity and thermal conductivity was studied experimentally. The measurements were carried out using the contact-free laser flash (Netzsch LFA 457) method in the temperature range 301–823 K. Based on the measured values of the thermal diffusivity of black coal, the heat transfer process in a coal bed was studied. It is shown that taking into account the temperature dependence of the thermal diffusivity of the medium when solving the heat transfer equation significantly affects the temperature distribution in the coal bed.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Density and Molar Volume of Liquid Amalgams of Thallium, Lead, and Bismuth 铊、铅和铋液态汞合金的密度和摩尔体积
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030161
V. S. Savvin
{"title":"Density and Molar Volume of Liquid Amalgams of Thallium, Lead, and Bismuth","authors":"V. S. Savvin","doi":"10.1134/s0018151x23030161","DOIUrl":"https://doi.org/10.1134/s0018151x23030161","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Using an evacuated two-capillary pycnometer, the density and molar volume of liquid solutions of thallium, lead, and bismuth in mercury were measured. The measurements were carried out over the entire range of compositions at temperatures from liquidus to 400–500°C.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Equation of State for Aluminum at High Pressures 铝在高压下的状态方程
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030227
K. V. Khishchenko
{"title":"Equation of State for Aluminum at High Pressures","authors":"K. V. Khishchenko","doi":"10.1134/s0018151x23030227","DOIUrl":"https://doi.org/10.1134/s0018151x23030227","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The study describes the thermodynamic properties of aluminum in a wide range of high-energy states. The form of the functional relationship between the pressure, specific volume, and specific internal energy of the condensed phase is proposed for the metal. The calculated adiabats of shock compression of aluminum are compared with the available data from shock-wave experiments. The constructed equation of state can be used to simulate the processes of intense pulse action on metal.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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 Vortex Flow in a Closed Volume and Some Anomalous Phenomena in the Earth’s Atmosphere 封闭空间中的三维涡流和地球大气中的一些异常现象
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030045
O. A. Sinkevich, G. O. Zinchenko
{"title":"Three-Dimensional Vortex Flow in a Closed Volume and Some Anomalous Phenomena in the Earth’s Atmosphere","authors":"O. A. Sinkevich, G. O. Zinchenko","doi":"10.1134/s0018151x23030045","DOIUrl":"https://doi.org/10.1134/s0018151x23030045","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The possibilities of the formation and characteristics of a special type of stationary concentrated vortices <span>(;nabla times mathbf{u} = kmathbf{u})</span> are studied with respect to the Earth’s atmosphere. A generalization of this type of vortices to a spherical coordinate system is presented, belonging to the class of Gromeki–Beltrami, N.E. Zhukovsky, and S.G. Chefranov flows. Two types of new solutions to the problem of a concentrated vortex with two and three velocity vector components are constructed: (1) the centers of the Cartesian and spherical coordinate systems coincide; (2) the spherical vortex is located above a solid surface. The distributions of vector fields of velocities and pressure in a concentrated vortex are found. This solution expands the problem of a concentrated vortex in a cylindrical coordinate system studied previously by the authors. The influence of the thickness of the spherical layer on the change in flow characteristics is analyzed. The use of the obtained characteristics of concentrated vortices to interpret a number of observed anomalous phenomena in the atmosphere, such as UFOs and ball lightning, is discussed, the explanation of frequently involves mechanisms that lie beyond the boundaries of modern physics.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140125104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Physical and Chemical Characteristics of a Plasma Flow around Descent Vehicles upon Entry in the Earth’s Atmosphere at Orbital Velocity 以轨道速度进入地球大气层时下降飞行器周围等离子体流的物理和化学特征
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030215
V. Y. Tugaenko, A. S. Gribkov, S. T. Surzhikov
{"title":"Physical and Chemical Characteristics of a Plasma Flow around Descent Vehicles upon Entry in the Earth’s Atmosphere at Orbital Velocity","authors":"V. Y. Tugaenko, A. S. Gribkov, S. T. Surzhikov","doi":"10.1134/s0018151x23030215","DOIUrl":"https://doi.org/10.1134/s0018151x23030215","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The characteristics of a plasma flow around the descent vehicle of a <i>Soyuz</i> spacecraft when passing through the Earth’s atmosphere are studied. For the first time, the chemical composition of the compressed layer and the plasma flow in the downstream area, accessible for instrumental examinations through the descent vehicle porthole, are estimated. The characteristics of the equipment developed for conducting the space experiment to study the emission spectrum of the plasma layer around the descent vehicle are described.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Simulation of the Interaction of a Shock Wave with a Foam Layer Using a Two-Fluid Approach 采用双流体方法对冲击波与泡沫层的相互作用进行数值模拟
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030197
P. A. Chuprov, P. S. Utkin, S. V. Fortova, A. D. Kiverin
{"title":"Numerical Simulation of the Interaction of a Shock Wave with a Foam Layer Using a Two-Fluid Approach","authors":"P. A. Chuprov, P. S. Utkin, S. V. Fortova, A. D. Kiverin","doi":"10.1134/s0018151x23030197","DOIUrl":"https://doi.org/10.1134/s0018151x23030197","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article studies the applicability of the Baer–Nunziato two-fluid model to the problem of interaction of a shock wave with a foam layer. The determining system of equations is formulated. A computational algorithm based on the Harten–Lax–Van Leer scheme with contact discontinuity resolution, including phase velocity and pressure relaxation stages, is proposed and described in detail. Using the proposed computational technology, the problem of propagation of a weak perturbation in a two-phase medium is considered. The propagation velocity obtained is close to the estimate using Wood formula. The problem of the interaction of a shock wave with a foam layer near an impenetrable wall is also considered. The formulation corresponds to full-scale experiments. The nonstationary wave dynamics realized in this problem using the proposed model is described. Good qualitative and quantitative agreement is obtained between the calculation results and experimental data.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
First-Principal Study of Proton Transfer in Metal Oxide Perovskite 金属氧化物过氧化物中质子转移的第一原理研究
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030112
A. E. Galashev
{"title":"First-Principal Study of Proton Transfer in Metal Oxide Perovskite","authors":"A. E. Galashev","doi":"10.1134/s0018151x23030112","DOIUrl":"https://doi.org/10.1134/s0018151x23030112","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The mechanism of proton conduction of defect-free perovskite LaScO<sub>3</sub> was investigated by <i>ab</i> <i>initio</i> molecular dynamics. The effects of the initial location and speed of a proton, the electric field, and the temperature of the system on the behavior of a proton in metal oxides of the perovskite type are considered. It is shown that the temperature of the system is the main factor affecting the speed of proton movement. The Arrhenius temperature behavior of proton conduction is found. In the absence of oxygen vacancies, the direction of proton movement in a crystal with a perovskite structure is determined by its interaction with lattice phonons; i.e., proton migration through metal-oxide perovskite has a polaronic character. Better understanding of the nature of proton migration along the perfect perovskite is one of the ways to improve the characteristics of clean energy devices.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Inversion of the Boiling Curve on Microstructured Porous Coatings 微结构多孔涂层的沸腾曲线反转
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23020165
D. A. Shvetsov, A. N. Pavlenko, A. E. Brester, V. I. Zhukov
{"title":"Inversion of the Boiling Curve on Microstructured Porous Coatings","authors":"D. A. Shvetsov, A. N. Pavlenko, A. E. Brester, V. I. Zhukov","doi":"10.1134/s0018151x23020165","DOIUrl":"https://doi.org/10.1134/s0018151x23020165","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper presents an experimental study of heat transfer during boiling in a thin horizontal layer of liquid on a capillary-porous coating. A sample of a stainless steel coating was manufactured using additive 3D printing technology with selective laser sintering. An inversion of the boiling curve was observed on the coating, which led to a fivefold decrease in temperature difference compared to an uncoated surface. After 350 h of the test cycle, the heat flux rate at which the boiling curve inversion occurred decreased by a factor of 7.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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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