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Equation of State and Size Distribution of Particles in the Gibbs System 吉布斯系统中粒子的状态方程和粒度分布
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23010078
V. V. Ryazanov
{"title":"Equation of State and Size Distribution of Particles in the Gibbs System","authors":"V. V. Ryazanov","doi":"10.1134/s0018151x23010078","DOIUrl":"https://doi.org/10.1134/s0018151x23010078","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Within the framework of the Gibbs statistical theory, the issue of the size distribution of particles forming a statistical system and the moments of this distribution are considered. The size distribution of particles and the moments of this distribution are determined from probabilistic considerations. The particle size depends on the interactions in the system, the compressibility factor, the number of interacting particles, and the volume of the system. The relations for the average particle size are substituted into expressions for the intrinsic volume of particles in the equations of state written using excluded volume theory for various expressions for the exclusion factor. The equations of state obtained in this way can be considered as a refinement of the equation of state for dense systems, that is, as a transition to a higher level of description.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025761","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
Intensive Emission of Droplets during Melting of Metal Samples in a High-Frequency Inductor 金属样品在高频感应器中熔化过程中液滴的密集发射
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020049
T. I. Borodina, V. V. Glazkov, Yu. P. Ivochkin, K. G. Kubrikov, O. A. Sinkevich, I. O. Teplyakov, S. M. Yudin
{"title":"Intensive Emission of Droplets during Melting of Metal Samples in a High-Frequency Inductor","authors":"T. I. Borodina, V. V. Glazkov, Yu. P. Ivochkin, K. G. Kubrikov, O. A. Sinkevich, I. O. Teplyakov, S. M. Yudin","doi":"10.1134/s0018151x23020049","DOIUrl":"https://doi.org/10.1134/s0018151x23020049","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of experimental and computational studies of the processes accompanying the melting of metal samples heated in air using induced currents are presented. The materials used for the experimental models—spheres and cylinders with a characteristic size of 10 mm—were pure iron, nonferrous metals, and various grades of steel. An unusual physical effect observed in experiments with iron and steels and associated with the intense release of sparks from the samples was studied: small brightly glowing metal droplets. A possible thermomechanical mechanism for the emission of droplets is proposed, based on the occurrence of excess melt pressure during metal melting inside the volume of the sample, limited by the resulting solid shell consisting of iron oxides. Numerical calculations were carried out, the results of which generally confirm the hypothesis presented.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025353","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
Heat Transfer Enhancement and Flow Characteristics Past Trapezoidal Bluff Body Embedded in Unconfined Cavity Filled with Nanofluid 嵌入填充纳米流体的非封闭空腔中的梯形崖体的传热增强和流动特性
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020062
B. Ghozlani, S. Hadj-Salah, S. Bezi, B. Souayeh
{"title":"Heat Transfer Enhancement and Flow Characteristics Past Trapezoidal Bluff Body Embedded in Unconfined Cavity Filled with Nanofluid","authors":"B. Ghozlani, S. Hadj-Salah, S. Bezi, B. Souayeh","doi":"10.1134/s0018151x23020062","DOIUrl":"https://doi.org/10.1134/s0018151x23020062","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A numerical study has been carried out to investigate the forced convective flow around a trapezoidal cylinder exposed to a uniform stream of nanofluid. Water-based nanofluid containing various types of nanoparticles (Al<sub>2</sub>O<sub>3</sub>, Cu, and CuO) with the solid volume fraction φ varying from 0 to 8% were used to examine the fluid flow and potential heat transfer enhancement from the heated cylinder. Computations based on the finite volume method with SIMPLE algorithm have been carried out at the steady laminar flow regime with a Peclet number range of 25 ≤ Pe ≤ 150. Nanofluids flow and heat transfer characteristics are found to be highly dependent on solid volume fraction, Peclet number, and nanoparticles shapes. Enhanced wake lengths and surface vorticity, reduced drag and higher heat transfer rates are seen in nanofluids. Furthermore, the results reveal that one type of nanoparticle is a key factor for improving some engineering parameters. In particular, the height values of the average Nusselt number Nu<sub>av</sub>, the maximal surface vorticity ω<sub><i>s</i></sub>, <sub>max</sub>, and the dimensionless wake length <i>L</i><sub><i>r</i></sub> are obtained while using Cu nanoparticles. However, the values of the drag coefficient <span>({{C}_{D}})</span> are higher for Al<sub>2</sub>O<sub>3</sub> nanoparticles. Eventually, reliable correlations for <span>({{omega }_{{smax }}})</span>, <span>({{C}_{D}})</span><sub>,</sub> and Nu<sub>av</sub> in terms of φ and Pe have been developed throughout this study.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025760","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
Critical Anomalies and Phase Diagrams of a Binary Mixture 二元混合物的临界异常和相图
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020025
M. Yu. Belyakov
{"title":"Critical Anomalies and Phase Diagrams of a Binary Mixture","authors":"M. Yu. Belyakov","doi":"10.1134/s0018151x23020025","DOIUrl":"https://doi.org/10.1134/s0018151x23020025","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The study examines the behavior of a binary mixture in the vicinity of the liquid–vapor critical point. It is shown that the pressure dependence on density along the critical isotherm, predicted within the framework of the existing theory of critical phenomena, does not match the shape of the dew-bubble curves. The problem is analyzed with the equation of state for a multicomponent near-critical mixture, adapted to describe thermophysical properties of a binary mixture. To eliminate the problem it is proposed to impose an additional condition on the equation of state coefficient. Possible consequences of imposing such a condition are considered.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025693","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
Analytical Method for Calculating Eigenvalues in the Problem of Nonstationary Heat Conduction of a Spherical Body 计算球体非稳态热传导问题特征值的分析方法
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020190
Yu. V. Vidin, V. S. Zlobin
{"title":"Analytical Method for Calculating Eigenvalues in the Problem of Nonstationary Heat Conduction of a Spherical Body","authors":"Yu. V. Vidin, V. S. Zlobin","doi":"10.1134/s0018151x23020190","DOIUrl":"https://doi.org/10.1134/s0018151x23020190","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A method for investigating characteristic equations is proposed, and analytical formulas are obtained for determining the roots of the characteristic equation in the problem of nonstationary heat conduction of a spherical body. These formulas make it possible to determine any required number of roots with high accuracy, which is especially important when solving heat conduction problems at the initial moment of time. The proposed method can be used to study more complex characteristic equations arising in other heat transfer problems.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025694","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
Two-Phase Flow Boiling of Nanofluids in Mini- and Microchannels 纳米流体在小型和微型通道中的两相流动沸腾
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020074
M. Kabir, J. Downer, E. Preller, C. Tarau, B. Yang, J. Xu
{"title":"Two-Phase Flow Boiling of Nanofluids in Mini- and Microchannels","authors":"M. Kabir, J. Downer, E. Preller, C. Tarau, B. Yang, J. Xu","doi":"10.1134/s0018151x23020074","DOIUrl":"https://doi.org/10.1134/s0018151x23020074","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The effects of single-phase nanofluid flow in mini-/microchannels have been investigated both experimentally and numerically in the literature during the last decade. Almost all the studies show a similar trend by which the engagement of single-phase nanofluids to mini-/microchannels provides significant improvements in the thermal performance. However, there are only limited number of publications in the literature, which have experimentally focused on the heat transfer performance of nanofluids for two-phase flow boiling in mini-/microchannels. Moreover, there are some noticeably conflicting trends concluded by these experimental studies, particularly for the boiling heat transfer coefficient. In the present review, the key clue to figure out the contradictions reflected in the literature on the experimental measurements of boiling heat transfer coefficient is traced to the various deposition patterns of nanoparticles of different sizes on the boiling surface and subsequent changes in the morphology and boiling behavior as well. In addition, the crucial parameters of nanofluids in mini-/microchannels during flow boiling are identified and the effects of the parameters on the boiling heat transfer performance are comprehensively reviewed. The agreements and inconsistencies reported in the literature are also identified and discussed. Finally, a series of suggestions are provided for future experimental studies of nanofluids flow boiling to minimize the contradictory reports.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025765","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
On the Vapor Film Destabilization Mechanism during Unsteady Film Boiling 论非稳态薄膜沸腾过程中的蒸汽薄膜失稳机制
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020086
P. K. Kanin, V. V. Yagov, A. R. Zabirov, I. A. Molotova, M. M. Vinogradov, V. A. Ryazantsev
{"title":"On the Vapor Film Destabilization Mechanism during Unsteady Film Boiling","authors":"P. K. Kanin, V. V. Yagov, A. R. Zabirov, I. A. Molotova, M. M. Vinogradov, V. A. Ryazantsev","doi":"10.1134/s0018151x23020086","DOIUrl":"https://doi.org/10.1134/s0018151x23020086","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We present new experimental data on the cooling of nickel and duralumin spheres in subcooled water and ethanol, along with a review of our comprehensive experimental investigations from 2015 to 2022. The hypothesis on the vapor film destabilization mechanism during unsteady cooling of high-temperature bodies is elucidated. Additionally, new correlations are proposed for estimating the temperature head at the cessation of film boiling in both saturated and subcooled liquids. The derived equations are validated against an extensive body of proprietary experimental data as well as data from other researchers, exhibiting strong qualitative and quantitative agreement with experimental outcomes.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025016","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 Iron Oxide at a Pressure ≤1 TPa 压力 ≤1 TPa 时的氧化铁状态方程
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020141
D. N. Nikolaev, I. V. Lomonosov
{"title":"Equation of State of Iron Oxide at a Pressure ≤1 TPa","authors":"D. N. Nikolaev, I. V. Lomonosov","doi":"10.1134/s0018151x23020141","DOIUrl":"https://doi.org/10.1134/s0018151x23020141","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The thermophysical properties of shock-compressed porous iron oxide at pressures up to 1 TPa were determined for the first time. The results agree well with earlier static and dynamic measurements in the pressure range up to 0.2 TPa. An equation of state for the high-pressure phase of iron oxide was constructed and compared with data at high pressures and temperatures.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025982","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
Temperature Dependence of Thermophysical Properties and Changes in the Thermodynamic Functions of Mg–La System Alloys 镁-镭系合金热物理性质的温度依赖性和热力学函数的变化
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-02-29 DOI: 10.1134/s0018151x23010212
I. N. Ganiev, A. G. Safarov, E. S. Dodkhoev, K. Boturov, U. Sh. Yakubov, F. Kholmurodov
{"title":"Temperature Dependence of Thermophysical Properties and Changes in the Thermodynamic Functions of Mg–La System Alloys","authors":"I. N. Ganiev, A. G. Safarov, E. S. Dodkhoev, K. Boturov, U. Sh. Yakubov, F. Kholmurodov","doi":"10.1134/s0018151x23010212","DOIUrl":"https://doi.org/10.1134/s0018151x23010212","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In cooling mode, the temperature dependence of the specific heat and changes in the thermodynamic functions of alloys of the Mg–La system in the temperature range of 300–700 K were studied. It has been shown that with increasing lanthanum concentration, the specific heat of magnesium, especially with the addition of lanthanum from 5 to 10%, noticeably decreases, and increases with increasing temperature. It has been established that with increasing temperature, the enthalpy and entropy of the alloys increase, and the values of the Gibbs energy decrease. The dependence of these functions on the lanthanum content in magnesium is inverse.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140005106","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
Erratum to: Microlevel Modeling of Thermophysical and Hydrodynamic Processes of Selective Laser Melting 勘误：选择性激光熔化热物理和流体力学过程的微观建模
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-02-29 DOI: 10.1134/s0018151x23010224
A. S. Boreisho, G. T. Dzhgamadze, V. V. Zybina, A. A. Moiseev, A. V. Savin, P. G. Smirnov, S. S. Smolentsev, V. A. Timofeev, P. S. Tret’yak
{"title":"Erratum to: Microlevel Modeling of Thermophysical and Hydrodynamic Processes of Selective Laser Melting","authors":"A. S. Boreisho, G. T. Dzhgamadze, V. V. Zybina, A. A. Moiseev, A. V. Savin, P. G. Smirnov, S. S. Smolentsev, V. A. Timofeev, P. S. Tret’yak","doi":"10.1134/s0018151x23010224","DOIUrl":"https://doi.org/10.1134/s0018151x23010224","url":null,"abstract":"<p>An Erratum to this paper has been published: https://doi.org/10.1134/S0018151X23010224</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004993","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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