High Temperature最新文献_第3页

Natural Thermogravitational Convection in a Partially Blocked Square Area Heated from Below: Local and Medium Heat Transfer 从下方加热的部分封闭方形区域中的自然热重对流：局部和介质传热

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x23050048

I. A. Ermolaev

引用次数: 0

Influence of Chemical Reactions in a Boundary Layer on the Overall Heat-and-Mass Transfer Coefficient 边界层中的化学反应对整体传热传质系数的影响

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x23040107

V. V. Mironov, M. A. Tolkach, V. V. Tlevtsezhev

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System of Model Kinetic Equations for a Multicomponent Gas 多组分气体的模型动力学方程组

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x23050115

Yu. A. Nikitchenko, S. A. Popov, N. I. Sergeeva

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The Problem of the Equation of State of Refractory Metals in the Near-Critical Region 近临界区难熔金属的状态方程问题

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x23050176

A. S. Shumikhin

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Electrical Resistance of Liquid Carbon (up to 9000 K) and Liquid Gadolinium (up to 6000 K) at Elevated Pressure and High Temperatures 液态碳（最高 9000 K）和液态钆（最高 6000 K）在高压和高温下的电阻特性

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x23050127

S. V. Onufriev, A. I. Savvatimskiy

{"title":"Electrical Resistance of Liquid Carbon (up to 9000 K) and Liquid Gadolinium (up to 6000 K) at Elevated Pressure and High Temperatures","authors":"S. V. Onufriev, A. I. Savvatimskiy","doi":"10.1134/s0018151x23050127","DOIUrl":"https://doi.org/10.1134/s0018151x23050127","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Experiments are carried out on rapid heating by an electric current pulse of plates for anisotropic graphite and gadolinium foil clamped in the same way: between two thick-walled plates of TF-5 glass (heavy flint). In both cases, the glass cells were previously compressed with a clamp to create some initial pressure. During the passage of the current pulse (5 μs), the pressure in the samples is estimated; it increases due to thermal expansion when confined by the glass plates. The electrical resistance of liquid carbon at low pressures (up to 1 kbar) increases with increasing temperature, just as for most conductors. Under limited expansion (increasing pressure), the electrical resistance of liquid carbon becomes constant, independent of the increase in temperature and pressure (up to 9000 K). Unlike carbon, the electrical resistance of liquid gadolinium at elevated pressure (about 1 kbar) practically did not change (~260 µm cm) and remained approximately constant, as at lower pressures (~0.3 kbar); and at high temperatures, up to 6000 K.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887450","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 of Zirconium at High Pressures 锆在高压下的状态方程

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x23050073

K. V. Khishchenko

引用次数: 0

Heat Capacity and Thermodynamic Functions of the Aluminum Alloy AlCu4.5Mg1 Alloyed with Barium 与钡合金化的铝合金 AlCu4.5Mg1 的热容量和热力学函数

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x2305005x

I. N. Ganiev, R. S. Shonazarov, A. Elmurod, U. N. Faizulloev

{"title":"Heat Capacity and Thermodynamic Functions of the Aluminum Alloy AlCu4.5Mg1 Alloyed with Barium","authors":"I. N. Ganiev, R. S. Shonazarov, A. Elmurod, U. N. Faizulloev","doi":"10.1134/s0018151x2305005x","DOIUrl":"https://doi.org/10.1134/s0018151x2305005x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of the experimental determination of the heat capacity of the aluminum alloy AlCu4.5Mg1 alloyed with barium and the calculation of the temperature dependences of changes in the thermodynamic functions of this alloy are presented. Studies of the temperature dependence of the heat capacity of the AlCu4.5Mg1 alloy alloyed with barium are carried out in the cooling mode using a computer and the Sigma Plot 10.0 software. The types of polynomials of the temperature dependence of the heat capacity and changes in thermodynamic functions (enthalpy, entropy, and Gibbs energy) of the studied alloy and the standard (Al grade A5N), which describe these changes with the correlation coefficient <i>R</i><sub>cor</sub> = 0.999, are established. It is shown that with the increasing barium content, the heat capacity of the original alloy decreases. The enthalpy and entropy of the AlCu4.5Mg1 alloy alloyed with barium increase with increasing temperature, and decrease with the increasing barium content. The Gibbs energy values have an inverse relationship.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203355","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

Thermal State of a Region with a Thermally Insulated Moving Boundary 热绝缘移动边界区域的热状态

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x23050061

E. M. Kartashov

{"title":"Thermal State of a Region with a Thermally Insulated Moving Boundary","authors":"E. M. Kartashov","doi":"10.1134/s0018151x23050061","DOIUrl":"https://doi.org/10.1134/s0018151x23050061","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Mathematical model representations of the temperature effect in regions with a thermally insulated moving boundary are developed. The boundary conditions for thermal insulation of a moving boundary are formulated both for locally equilibrium heat transfer processes within the classical Fourier phenomenology and for more complex locally nonequilibrium processes within the Maxwell–Cattaneo–Lykov–Vernott phenomenology, taking into account the finite speed of heat propagation. The applied problem of heat conductance and the theory of thermal shock for a region with a moving thermally insulated boundary, free from external and internal influences, is considered. An exact analytical solution of the formulated mathematical models for equations of the hyperbolic type is obtained. Methods and theorems of operational calculus and Riemann–Mellin contour integrals are used to calculate the originals of complex images with two branch points. A mathematical apparatus for the equivalence of functional structures for the originals of the obtained operational solutions is proposed. It is shown that the presence of a thermally insulated moving boundary leads to the appearance of a temperature gradient in the region and, consequently, to the appearance in the region of a temperature field and corresponding thermoelastic stresses of a wave nature. A numerical experiment is presented and the possibility of transition from one form of analytical solution of the temperature problem to another equivalent form is shown. The described effect manifests itself both for equations of the parabolic type based on classical Fourier phenomenology and for equations of hyperbolic type based on the generalized phenomenology of Maxwell–Cattaneo–Lykov–Vernott.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887192","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

Shock Compression of Molybdenum under Impact of Ultrashort Laser Pulses 超短激光脉冲冲击下的钼冲击压缩

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x23050012

S. I. Ashitkov, E. V. Struleva, P. S. Komarov, S. A. Evlashin

引用次数: 0

Laminar Pulsating Flow at the Initial Segment of a Flat Channel 扁平通道初始段的层流脉动流

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x23040168

E. P. Valueva, V. S. Zukin

{"title":"Laminar Pulsating Flow at the Initial Segment of a Flat Channel","authors":"E. P. Valueva, V. S. Zukin","doi":"10.1134/s0018151x23040168","DOIUrl":"https://doi.org/10.1134/s0018151x23040168","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A method is proposed for solving the problem of a pulsating quasistationary flow in a channel, based on the use of calculation results for stationary flow. This approach is applicable at low relative oscillation frequencies (for Womersley numbers less than one). The solution to the system of stationary equations of motion and continuity in the initial section of a flat channel was carried out by the finite difference method using an iterative implicit unconditionally stable scheme. The hydrodynamic characteristics of a developing pulsating laminar flow in a flat channel have been studied. The results of calculating the longitudinal velocity component and the Poiseuille and Euler numbers are presented as a function of the relative amplitude of the oscillation of the cross-sectional average velocity <i>A</i> and dimensionless length of the channel. It was found that for <i>A</i> values exceeding unity, the period-averaged coefficients of hydraulic resistance and friction resistance near the inlet to the channel are significantly higher than these values for a stationary flow. It has been shown that in order to achieve a pulsating flow with large amplitudes of oscillations, it is necessary to create a time-average pressure drop approximately three times higher (at <i>A</i> = 5) than for a stationary flow.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882869","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