Pub Date : 2024-03-22DOI: 10.1134/s0018151x23050140
S. V. Rykov, I. V. Kudryavtseva, V. A. Rykov
Abstract
The correlation dependence of thermal conductivity ({{lambda }_{{text{s}}}}) of liquid refrigerants on the saturation line is developed as a simple function of temperature (T): ({{lambda }_{{text{s}}}}{text{/}}{{lambda }_{0}} = {{(1 + tau )}^{2}} + A{{tau }^{{ - chi }}}) (where ({{lambda }_{0}}) is the criterion unit, (tau = 1 - T{text{/}}{{T}_{{text{c}}}}), and ({{T}_{{text{c}}}}) is the critical temperature). This dependence satisfies the requirements of dynamic scale theory (ST), and in particular, the passage to the limit ({{lambda }_{{text{s}}}}(T to {{T}_{{text{c}}}}) to + infty ). The proposed correlation dependence is tested using the example of describing the thermal conductivity of 17 liquid substances in the range of state parameters from the saturation line to the critical pressure ({{p}_{{text{c}}}}) and in the temperature range from the triple point temperature Ttr to ({{T}_{{text{c}}}}). The substances reviewed include nine fourth-generation refrigerants of hydrofluorochloro derivatives of olefins, seven hydrochlorofluorocarbons and hydrofluorocarbons, and C3H8. Using the description of ({{lambda }_{{text{s}}}}) of C3H8 as an example, it is shown that the proposed correlation dependence not only qualitatively but also quantitatively accurately conveys the behavior of ({{lambda }_{{text{s}}}}) in the vicinity of the critical point. Based on the statistical analysis, it is shown that the proposed correlation with significantly less uncertainty describes the data on the thermal conductivity of liquid hydrofluorochloro derivatives of olefins both on the saturation line and in the single-phase region. Based on the proposed methodology, the thermal conductivity of the cis-isomer R1225ye(Z) is calculated for the first time in the temperature range (134.3,,{text{K}} leqslant T leqslant 373.15,,{text{K}}).
Abstract The correlation dependence of thermal conductivity ({{lambda }_{{text{s}}}}) of liquid refrigerants on the saturation line is developed as a simple function of temperature (T)：{{lambda }_{{text{s}}}}{text{/}}{{lambda }_{0}} = {{(1 + tau )}^{2}}+ A{{tau }^{{ - chi }}}) （其中，({{lambda }_{0}})是标准单位，(tau = 1 - T{{text{/}}{{T}_{{{c}}}}) ，({{T}_{text{c}}}})是临界温度）。这种相关性满足动态尺度理论（ST）的要求，特别是通过极限 ({{lambda }_{{text{s}}}}(T to {{T}_{{text{c}}}}) to + infty )。以描述 17 种液态物质在从饱和线到临界压力 ({{p}_{text{c}}}})的状态参数范围内以及在从三相点温度 Ttr 到 ({{T}_{text{c}}}})的温度范围内的热导率为例，检验了所提出的相关性。所审查的物质包括九种第四代烯烃氢氟氯衍生物制冷剂、七种氯氟烃和氢氟烃以及 C3H8。以 C3H8 的 ({{lambda }_{text/{s}}}})的描述为例，证明了所提出的相关依赖不仅定性而且定量地准确表达了临界点附近的 ({{lambda }_{text/{s}}}})行为。基于统计分析，结果表明所提出的相关性在描述烯烃的液态氢氟氯衍生物在饱和线和单相区域的热导率数据时，不确定性明显降低。根据所提出的方法，首次计算了顺式异构体 R1225ye(Z) 在温度范围 (134.3,,{text{K}} leqslant T leqslant 373.15,,{text{K}}) 内的热导率。
{"title":"New Correlation Model of Thermal Conductivity of Liquid Hydrofluorochloro Derivatives of Olefins, Hydrofluorocarbons, and Hydrochlorofluorocarbons","authors":"S. V. Rykov, I. V. Kudryavtseva, V. A. Rykov","doi":"10.1134/s0018151x23050140","DOIUrl":"https://doi.org/10.1134/s0018151x23050140","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The correlation dependence of thermal conductivity <span>({{lambda }_{{text{s}}}})</span> of liquid refrigerants on the saturation line is developed as a simple function of temperature <span>(T)</span>: <span>({{lambda }_{{text{s}}}}{text{/}}{{lambda }_{0}} = {{(1 + tau )}^{2}} + A{{tau }^{{ - chi }}})</span> (where <span>({{lambda }_{0}})</span> is the criterion unit, <span>(tau = 1 - T{text{/}}{{T}_{{text{c}}}})</span>, and <span>({{T}_{{text{c}}}})</span> is the critical temperature). This dependence satisfies the requirements of dynamic scale theory (ST), and in particular, the passage to the limit <span>({{lambda }_{{text{s}}}}(T to {{T}_{{text{c}}}}) to + infty )</span>. The proposed correlation dependence is tested using the example of describing the thermal conductivity of 17 liquid substances in the range of state parameters from the saturation line to the critical pressure <span>({{p}_{{text{c}}}})</span> and in the temperature range from the triple point temperature <i>T</i><sub>tr</sub> to <span>({{T}_{{text{c}}}})</span>. The substances reviewed include nine fourth-generation refrigerants of hydrofluorochloro derivatives of olefins, seven hydrochlorofluorocarbons and hydrofluorocarbons, and C<sub>3</sub>H<sub>8</sub>. Using the description of <span>({{lambda }_{{text{s}}}})</span> of C<sub>3</sub>H<sub>8</sub> as an example, it is shown that the proposed correlation dependence not only qualitatively but also quantitatively accurately conveys the behavior of <span>({{lambda }_{{text{s}}}})</span> in the vicinity of the critical point. Based on the statistical analysis, it is shown that the proposed correlation with significantly less uncertainty describes the data on the thermal conductivity of liquid hydrofluorochloro derivatives of olefins both on the saturation line and in the single-phase region. Based on the proposed methodology, the thermal conductivity of the cis-isomer R1225ye(Z) is calculated for the first time in the temperature range <span>(134.3,,{text{K}} leqslant T leqslant 373.15,,{text{K}})</span>.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"15 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140196232","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}
Pub Date : 2024-03-22DOI: 10.1134/s0018151x23060093
E. V. Usov, V. I. Chukhno, I. A. Klimonov, D. P. Veprev, N. A. Mosunova, V. F. Strizhov
Abstract
The paper presents approaches that can be used to analyze the behavior of mixed nitride uranium–plutonium fuel rods during emergency situations accompanied by thermal destruction of fuel rods. The validation results based on currently available data are presented. The calculation error was estimated from the validation results. Based on the validated model, the results of a numerical study of the specific features of the breakdown of mixed nitride uranium–plutonium fuel rods are presented for accident conditions typical of reactor plants with sodium and lead coolants.
{"title":"Numerical Study of Thermal Destruction of Nitride Fuel Rods Using the Severe Accident Module of the Integral Euclid/V2 Code","authors":"E. V. Usov, V. I. Chukhno, I. A. Klimonov, D. P. Veprev, N. A. Mosunova, V. F. Strizhov","doi":"10.1134/s0018151x23060093","DOIUrl":"https://doi.org/10.1134/s0018151x23060093","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper presents approaches that can be used to analyze the behavior of mixed nitride uranium–plutonium fuel rods during emergency situations accompanied by thermal destruction of fuel rods. The validation results based on currently available data are presented. The calculation error was estimated from the validation results. Based on the validated model, the results of a numerical study of the specific features of the breakdown of mixed nitride uranium–plutonium fuel rods are presented for accident conditions typical of reactor plants with sodium and lead coolants.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140196415","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}
Pub Date : 2024-03-22DOI: 10.1134/s0018151x23060056
I. K. Gimaltdinov, S. A. Lepikhin
Abstract
The paper presents the results of a numerical study of the interaction of detonation waves with counterpropagating pressure waves in a bubbly liquid. The change in the parameters of a detonation wave as it passes through the front of a counterpropagating pressure wave is analyzed. The possibility of controlling propagation of the detonation process by changing the state of the bubble system by counterpropagating pressure waves is studied.
{"title":"On Counteracting a Detonation Wave in a Bubbly Liquid Using Small-Amplitude Waves","authors":"I. K. Gimaltdinov, S. A. Lepikhin","doi":"10.1134/s0018151x23060056","DOIUrl":"https://doi.org/10.1134/s0018151x23060056","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper presents the results of a numerical study of the interaction of detonation waves with counterpropagating pressure waves in a bubbly liquid. The change in the parameters of a detonation wave as it passes through the front of a counterpropagating pressure wave is analyzed. The possibility of controlling propagation of the detonation process by changing the state of the bubble system by counterpropagating pressure waves is studied.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"15 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203248","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}
Pub Date : 2024-03-22DOI: 10.1134/s0018151x23060160
P. V. Bulat, K. N. Volkov, L. P. Grachev, I. I. Esakov, V. L. Bychkov
Abstract
The influence of preliminary ionization and excitation of molecules of a fuel–air mixture when exposed to an electron beam created in an external electric field on increasing the intensity of combustion processes is considered. To study the effect of electron beam plasma on the combustion of a propane–air mixture, a series of experiments were carried out. The characteristics of the propane–air mixture are determined before and after irradiation with an electron beam in the presence and absence of an external electric field. The boundaries of the combined effect of an electron beam and an external electric field are found to increase the efficiency of combustion of a propane–air mixture in a subsonic flow. A physical model of processes in a non-self-sustaining discharge in a subsonic flow of a combustible mixture under known experimental conditions is developed.
{"title":"Influence of an Accelerated Electron Beam and External Electric Field on the Combustion of a Propane–Air Mixture in a Subsonic Air Flow","authors":"P. V. Bulat, K. N. Volkov, L. P. Grachev, I. I. Esakov, V. L. Bychkov","doi":"10.1134/s0018151x23060160","DOIUrl":"https://doi.org/10.1134/s0018151x23060160","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The influence of preliminary ionization and excitation of molecules of a fuel–air mixture when exposed to an electron beam created in an external electric field on increasing the intensity of combustion processes is considered. To study the effect of electron beam plasma on the combustion of a propane–air mixture, a series of experiments were carried out. The characteristics of the propane–air mixture are determined before and after irradiation with an electron beam in the presence and absence of an external electric field. The boundaries of the combined effect of an electron beam and an external electric field are found to increase the efficiency of combustion of a propane–air mixture in a subsonic flow. A physical model of processes in a non-self-sustaining discharge in a subsonic flow of a combustible mixture under known experimental conditions is developed.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"18 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140205423","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}
Pub Date : 2024-03-22DOI: 10.1134/s0018151x23050164
M. N. Shamsiev, M. Kh. Khairullin, P. E. Morozov, V. R. Gadil’shina, A. I. Abdullin, A. V. Nasybullin
Abstract
A mathematical model of nonisothermal filtration of a fluid into a medium with double porosity is constructed. The influence of the filtration and thermophysical parameters of a fractured porous formation on the temperature and pressure in the bottom of a vertical oil well due to production is studied. Based on the proposed model, a computational algorithm for interpreting the results of the thermohydrodynamic studies of vertical wells is developed. Measurements of the pressure and temperature in the bottom of the well after its start-up are used as the initial information.
{"title":"Numerical Method For Solving the Inverse Problem of Nonisothermal Filtration in Double-Porosity Media","authors":"M. N. Shamsiev, M. Kh. Khairullin, P. E. Morozov, V. R. Gadil’shina, A. I. Abdullin, A. V. Nasybullin","doi":"10.1134/s0018151x23050164","DOIUrl":"https://doi.org/10.1134/s0018151x23050164","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A mathematical model of nonisothermal filtration of a fluid into a medium with double porosity is constructed. The influence of the filtration and thermophysical parameters of a fractured porous formation on the temperature and pressure in the bottom of a vertical oil well due to production is studied. Based on the proposed model, a computational algorithm for interpreting the results of the thermohydrodynamic studies of vertical wells is developed. Measurements of the pressure and temperature in the bottom of the well after its start-up are used as the initial information.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"132 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140196206","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}
Pub Date : 2024-03-22DOI: 10.1134/s0018151x23060019
A. K. Prajapati, V. Chaurasiya, P. K. Yadawa
Abstract
In the present paper, we calculated the elastic, mechanical, and thermophysical properties of NbN/MgO(001) layers in the temperature range 600–900°C using higher order elastic constants. With two fundamental factors, nearest-neighbour distance as well as hardness parameter, the second and third order elastic constants are estimated using the Born–Mayer potential approaches. The computed values of second order elastic constant are used to calculate Young modulus, thermal conductivity, Zener anisotropy, bulk modulus, thermal energy density, shear modulus as well as Poisson ratio in order to assess the thermal and mechanical properties of NbN/MgO(001) layers. Additionally, the second order elastic constant is also used to calculate the wave velocities for shear and longitudinal modes of propagation along crystalline orientations [100], [110], [111]. Temperature dependent Debye average velocity, hardness, and ultrasonic Grüneisen parameters are evaluated. The fracture/toughness B/G ratio in the current investigation is more than 1.75, indicating that the NbN/MgO(001) nanostructured layer is ductile in nature in this temperature range. The selected materials are fully satisfying the Born mechanical stability requirement. The time required for thermal relaxation is calculated and how ultrasonic waves are attenuated by thermo-elastic relaxation and phonon–phonon interaction mechanisms. The findings with other well-known physical features are helpful for industrial applications.
{"title":"Theoretical Investigation on Thermophysical, Mechanical, and Ultrasonic Properties of NbN Layers Deposited on MgO(001) Substrates at High Temperature","authors":"A. K. Prajapati, V. Chaurasiya, P. K. Yadawa","doi":"10.1134/s0018151x23060019","DOIUrl":"https://doi.org/10.1134/s0018151x23060019","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In the present paper, we calculated the elastic, mechanical, and thermophysical properties of NbN/MgO(001) layers in the temperature range 600–900°C using higher order elastic constants. With two fundamental factors, nearest-neighbour distance as well as hardness parameter, the second and third order elastic constants are estimated using the Born–Mayer potential approaches. The computed values of second order elastic constant are used to calculate Young modulus, thermal conductivity, Zener anisotropy, bulk modulus, thermal energy density, shear modulus as well as Poisson ratio in order to assess the thermal and mechanical properties of NbN/MgO(001) layers. Additionally, the second order elastic constant is also used to calculate the wave velocities for shear and longitudinal modes of propagation along crystalline orientations [100], [110], [111]. Temperature dependent Debye average velocity, hardness, and ultrasonic Grüneisen parameters are evaluated. The fracture/toughness <i>B</i>/<i>G</i> ratio in the current investigation is more than 1.75, indicating that the NbN/MgO(001) nanostructured layer is ductile in nature in this temperature range. The selected materials are fully satisfying the Born mechanical stability requirement. The time required for thermal relaxation is calculated and how ultrasonic waves are attenuated by thermo-elastic relaxation and phonon–phonon interaction mechanisms. The findings with other well-known physical features are helpful for industrial applications.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"15 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203409","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}
Pub Date : 2024-03-22DOI: 10.1134/s0018151x23060044
A. B. Medvedev
Abstract
Using previously developed equations of state for iron and titanium, the density of the Earth’s core was calculated at a mass content of titanium in a mixture with iron of ~20%. This concentration is taken from data for high-titanium (HT) basalts, the formation of which in large igneous provinces is hypothetically associated with the ascent of thermal plumes in the mantle from the core to the surface. The calculated density on pressure dependences in the outer liquid and inner solid cores satisfactorily agree with the data of the preliminary reference Earth model (PREM).
{"title":"Determination of the Density of the Earth’s Core Based on the Equations of State of Iron and Titanium at High Pressures and Temperatures","authors":"A. B. Medvedev","doi":"10.1134/s0018151x23060044","DOIUrl":"https://doi.org/10.1134/s0018151x23060044","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Using previously developed equations of state for iron and titanium, the density of the Earth’s core was calculated at a mass content of titanium in a mixture with iron of ~20%. This concentration is taken from data for high-titanium (HT) basalts, the formation of which in large igneous provinces is hypothetically associated with the ascent of thermal plumes in the mantle from the core to the surface. The calculated density on pressure dependences in the outer liquid and inner solid cores satisfactorily agree with the data of the preliminary reference Earth model (PREM).</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"3 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140196316","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}
Pub Date : 2024-03-22DOI: 10.1134/s0018151x23060159
A. Yu. Varaksin
Abstract
The main problems and features of the study of two-phase flows are considered. The main methods for the mathematical modeling of two-phase flows, which describe the interface boundary, interface interactions, and turbulence of the carrier phase at different hierarchical levels, are briefly described. Some of the latest research results on two-phase flows with solid particles, droplets, and bubbles are described and analyzed: effective methods of thermal protection of power propulsion systems operating on solid fuels; determining the contribution of carbon nanoparticle condensation to the combustion and detonation of gaseous hydrocarbons; aircraft anti-icing methods; specific features of the development and stability of a spray plume; acoustic wave propagation in multifractional polydisperse vapor–gas–droplet mixtures of gas with solid particles; development of detonation waves in a bubbly liquid; and many others.
{"title":"Hydrogasdynamics and Thermal Physics of Two-Phase Flows with Solid Particles, Droplets, and Bubbles","authors":"A. Yu. Varaksin","doi":"10.1134/s0018151x23060159","DOIUrl":"https://doi.org/10.1134/s0018151x23060159","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The main problems and features of the study of two-phase flows are considered. The main methods for the mathematical modeling of two-phase flows, which describe the interface boundary, interface interactions, and turbulence of the carrier phase at different hierarchical levels, are briefly described. Some of the latest research results on two-phase flows with solid particles, droplets, and bubbles are described and analyzed: effective methods of thermal protection of power propulsion systems operating on solid fuels; determining the contribution of carbon nanoparticle condensation to the combustion and detonation of gaseous hydrocarbons; aircraft anti-icing methods; specific features of the development and stability of a spray plume; acoustic wave propagation in multifractional polydisperse vapor–gas–droplet mixtures of gas with solid particles; development of detonation waves in a bubbly liquid; and many others.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140196402","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}
Pub Date : 2024-03-21DOI: 10.1134/s0018151x23050152
V. Sh. Shagapov, Z. A. Bulatova, G. F. Shayakhmetov
Abstract
The paper presents the results of a study of the evolution of a wave signal when reflected from a rigid wall with a vapor-gas bubble “curtain” located in front of it in a liquid, which takes into account the heat and mass transfer on the interphase surface in the acoustic approximation. Based on the numerical calculations, using the fast Fourier transform method, wave patterns for the evolution of pressure pulses are obtained and the influence of various parameters of the state of a liquid with vapor-gas bubbles on the reflection and passage of acoustic waves through the curtain in front of the solid wall is analyzed.
{"title":"Features of the Reflection of Pulse Signals from a Layer with Vapor-Gas Bubbles in Front of a Rigid Wall in Water","authors":"V. Sh. Shagapov, Z. A. Bulatova, G. F. Shayakhmetov","doi":"10.1134/s0018151x23050152","DOIUrl":"https://doi.org/10.1134/s0018151x23050152","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper presents the results of a study of the evolution of a wave signal when reflected from a rigid wall with a vapor-gas bubble “curtain” located in front of it in a liquid, which takes into account the heat and mass transfer on the interphase surface in the acoustic approximation. Based on the numerical calculations, using the fast Fourier transform method, wave patterns for the evolution of pressure pulses are obtained and the influence of various parameters of the state of a liquid with vapor-gas bubbles on the reflection and passage of acoustic waves through the curtain in front of the solid wall is analyzed.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"31 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203385","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}
Pub Date : 2024-03-21DOI: 10.1134/s0018151x23050206
A. Z. Zhuk, P. P. Ivanov
Abstract
The thermodynamic characteristics of the electrochemical process in a solid oxide fuel cell (SOFC) are determined using a physical model that takes into account the internal reforming of methane. These characteristics can be a useful tool for studying the thermodynamic cycles of power plants without calculating the physical processes in the fuel cell. The initial data when using them are the load factor and the specific surface resistance of the membrane-electrode assembly.
{"title":"Characteristics of a Solid Oxide Fuel Cell for the Thermodynamic Modeling of Power Plants","authors":"A. Z. Zhuk, P. P. Ivanov","doi":"10.1134/s0018151x23050206","DOIUrl":"https://doi.org/10.1134/s0018151x23050206","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The thermodynamic characteristics of the electrochemical process in a solid oxide fuel cell (SOFC) are determined using a physical model that takes into account the internal reforming of methane. These characteristics can be a useful tool for studying the thermodynamic cycles of power plants without calculating the physical processes in the fuel cell. The initial data when using them are the load factor and the specific surface resistance of the membrane-electrode assembly.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"22 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882953","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号