High Temperature最新文献_第7页

Fabrication and Performance Study of a New Design of Passive Thermosyphon Type Solar Water Heater 一种新型被动式热对称型太阳能热水器的制造和性能研究

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030057

M. U. Farooq, M. I. Hussain, M. Y. Naz, M. M. Makhlouf, S. Shukrullah, A. Ghaffar, K. Ibrahim, N. M. AbdEl-Salam

{"title":"Fabrication and Performance Study of a New Design of Passive Thermosyphon Type Solar Water Heater","authors":"M. U. Farooq, M. I. Hussain, M. Y. Naz, M. M. Makhlouf, S. Shukrullah, A. Ghaffar, K. Ibrahim, N. M. AbdEl-Salam","doi":"10.1134/s0018151x23030057","DOIUrl":"https://doi.org/10.1134/s0018151x23030057","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The work presents an example of a passive solar heating system, which utilizes direct solar energy to heat the water for domestic use. A passive thermosyphon heating system was designed, fabricated, and tested for its thermal performance in the semi-arid and four-season climate of the Faisalabad district of Pakistan. The heating system design was based on two-stage storage and natural thermosyphon circulation of water. An enhancement of the thermal performance of the thermosyphon systems by using a semicircular steel pot collector (covered with water carrying copper coil), two-step water storage, and side mirror reflectors was investigated. The experiments were conducted from April to July, 2014 when the ambient temperature was reported approximately between 30 to 45°C. For the cited time duration, the cold-water temperature remained in the range of 18 to 25°C. The maximum water temperature, during the intermittent flow mode operation of the system, remained between 48 and 88°C. In continuous flow mode operation, the hot water temperature remained between 46 and 78°C. Since water temperature in the range of 45 to 50°C is considered suitable for domestic use, the presented design is acceptable for domestic use.</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":"140124734","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

Pulse Impact on Cavitation Bubble Collapse 脉冲对气蚀泡塌陷的影响

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030148

A. A. Aganin, N. A. Khismatullina, R. I. Nigmatulin

{"title":"Pulse Impact on Cavitation Bubble Collapse","authors":"A. A. Aganin, N. A. Khismatullina, R. I. Nigmatulin","doi":"10.1134/s0018151x23030148","DOIUrl":"https://doi.org/10.1134/s0018151x23030148","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We consider the effect of concentric pulse impact (an abrupt increase in liquid pressure at some distance from a collapsing bubble surface) on the collapse of a spherical cavitation bubble in water. The vapor dynamics within the bubble and movement of the surrounding liquid are described by gasdynamic equations, closed by wide-range state equations. The thermal conductivity of both phases and heat and mass transfer on the surface of the bubble are taken into account. The calculation technique involves moving grids converging toward the bubble’s explicitly defined surface. The modified high-accuracy Godunov method is used. It has been found that the pulse impact accelerates the bubble collapse, and the bubble’s radius and pressure within its cavity increase at the end of the collapse. Under pulse impact, collapse of the bubble is accompanied by the periodic focusing of radially converging compression waves in the center of the bubble. At moments of focusing, the pressure in the small vicinity of the bubble center significantly increases. These noted features intensify with an increase in the amplitude of the impulse impact.</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":"140124627","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

Local Structural Features and Microscopic Dynamics of a Nickel Melt: Experimental Study and Molecular Dynamics Simulation 镍熔体的局部结构特征和微观动力学：实验研究与分子动力学模拟

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020098

R. M. Khusnutdinoff, R. R. Khairullina, A. L. Beltyukov, I. V. Sterkhova, A. A. Suslov, V. I. Ladyanov, A. V. Mokshin

{"title":"Local Structural Features and Microscopic Dynamics of a Nickel Melt: Experimental Study and Molecular Dynamics Simulation","authors":"R. M. Khusnutdinoff, R. R. Khairullina, A. L. Beltyukov, I. V. Sterkhova, A. A. Suslov, V. I. Ladyanov, A. V. Mokshin","doi":"10.1134/s0018151x23020098","DOIUrl":"https://doi.org/10.1134/s0018151x23020098","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The study examines local structural features, microscopic dynamics, and transport properties of an equilibrium and supercooled nickel melt. A comprehensive study of the corresponding physical properties of the nickel melt was carried out with large-scale molecular dynamics studies, X-ray diffraction experiments, and torsional vibration viscometry. Good agreement was obtained between the results of X-ray diffraction analysis of an equilibrium nickel melt and the results of molecular dynamics simulation for various EAM potentials and experimental neutron diffraction data. It has been established that in liquid nickel, the contribution of pair correlation entropy to the excess configuration entropy is <span>(sim )</span>60% in the high temperature region and <span>(sim )</span>80% near and below the melting point. Good agreement was found between the simulation results for the transport characteristics (self-diffusion and viscosity coefficients) of the nickel melt in a wide temperature range and the available experimental data and viscometry results. It is shown that the simulation results obtained with all considered interatomic interaction potentials are correctly reproduced by the modified Stokes–Einstein relation obtained using Rosenfeld scale transformations.</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":"140025015","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

Influence of the Physical and Chemical Properties of Particles on the Thermal Conductivity of Polymer Composite Materials 颗粒的物理和化学特性对聚合物复合材料导热性能的影响

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020153

R. A. Shishkin

引用次数: 0

Simulation of the Combustion Process of Methane Hydrate Taking into Account Incomplete Evaporation of Released Water during Its Dissociation 模拟甲烷水合物的燃烧过程，考虑到其解离过程中释放出的水分未完全蒸发的情况

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020013

I. M. Bayanov, I. K. Gimaltdinov, M. V. Stolpovsky

{"title":"Simulation of the Combustion Process of Methane Hydrate Taking into Account Incomplete Evaporation of Released Water during Its Dissociation","authors":"I. M. Bayanov, I. K. Gimaltdinov, M. V. Stolpovsky","doi":"10.1134/s0018151x23020013","DOIUrl":"https://doi.org/10.1134/s0018151x23020013","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A mathematical model of the combustion process of methane hydrate in a closed volume is presented, taking into account the kinetics of its decomposition (nonequilibrium), as well as absorption of thermal radiation energy. Based on the numerical solution by the large particle method, the distributions of the main parameters of the system were constructed. The authors compare the specific features of hydrate combustion for cases corresponding to different values of the fraction of evaporated water released during hydrate dissociation. It is shown that partial evaporation of water formed during decomposition of the hydrate leads to an increase in the combustion temperature of the gas mixture and to more intense decomposition of the hydrate compared to the case of complete evaporation of all released water. The dependences of the flame temperature, the maximum pressure of the gas mixture, and the law of motion of the phase transition front on the degree of evaporation of the released water are constructed and analyzed.</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":"140025764","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

Asymmetric Complex Plasma Interaction Energy in the Poisson–Boltzmann Plus Hole Approximation 泊松-玻尔兹曼加孔近似中的不对称复杂等离子体相互作用能

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x2302013x

I. A. Martynova, I. L. Iosilevskiy

引用次数: 0

Numerical Study of Nonstandard Trajectories of Celestial Bodies Invading Earth’s Atmosphere 入侵地球大气层天体的非标准轨迹数值研究

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020177

N. G. Syzranova, V. A. Andrushchenko

引用次数: 0

Electrical Resistivity of the Ni45Mn46In9 Alloy Ni45Mn46In9 合金的电阻率

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020207

N. V. Volkova, V. V. Chistyakov, E. I. Patrakov, S. M. Emelyanova

引用次数: 0

Analytical and Numerical Solution of the Problem on Nonstationary Heat Exchange of Counterflows 逆流非稳态热交换问题的分析和数值求解

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020050

A. I. Filippov, O. V. Akhmetova, M. A. Zelenova

{"title":"Analytical and Numerical Solution of the Problem on Nonstationary Heat Exchange of Counterflows","authors":"A. I. Filippov, O. V. Akhmetova, M. A. Zelenova","doi":"10.1134/s0018151x23020050","DOIUrl":"https://doi.org/10.1134/s0018151x23020050","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A solution was obtained to the nonstationary problem of heat transfer of counterflows that occur when a liquid flows through a loop. At the far end of the loop, temperature equality is specified and the temperature difference at the inlet and outlet is determined based on calculations at a given temperature of the incoming transfer fluid. It is shown that the formation of thermophysical processes in the heat transfer system under consideration is governed by the dimensionless convective–conductive parameter <span>(Pnu ,)</span> which is the ratio of the contributions of convection and heat transfer to the heat exchange of the system. The solution is represented in the Laplace–Carson integral transform space. The originals were constructed using the den Iseger numerical inversion algorithm, since it is difficult to obtain them by analytical methods. The spatiotemporal dependences of temperature changes in the downstream and upstream flows are presented, which make it possible to broaden the existing understanding of physical processes for different values of the dimensionless convective–conductive parameter. It is shown that with increasing <span>(Pnu )</span>, the contribution of convection, as well as that of kinematic temperature waves, increases.</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":"140025529","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

Conductivity and Screening in Plasma with Arbitrary Electron Degeneracy 等离子体中的电导率和屏蔽与任意电子去能性

IF 1 4区物理与天体物理

High Temperature Pub Date : 2024-03-03 DOI: 10.1134/s0018151x23020189

S. A. Trigger, S. A. Maslov

引用次数: 0