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Designing Thermal Shield with Choice of Structure Parameters of Composite Based on Carbon Aerogel 基于碳气凝胶复合材料结构参数选择的隔热罩设计
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040052
M. O. Salosina, O. M. Alifanov, A. V. Nenarokomov
{"title":"Designing Thermal Shield with Choice of Structure Parameters of Composite Based on Carbon Aerogel","authors":"M. O. Salosina,&nbsp;O. M. Alifanov,&nbsp;A. V. Nenarokomov","doi":"10.1134/S1810232824040052","DOIUrl":"10.1134/S1810232824040052","url":null,"abstract":"<p>Thermal protection of spacecraft experiences significant thermal loads and requires optimal designing, in terms of both technological and mass characteristics. Carbon aerogels are great interest for development of light high-temperature thermal insulation materials. Introducing them into the structure of composites enables reducing the radiative component of thermal conductivity at high temperatures due to the high extinction coefficient of carbon aerogels in the infrared range. As reinforcing fillers in such materials, highly porous cellular materials can be used, which give the composite sufficient mechanical strength. The physical properties of composites depend strongly on the microstructure of the reinforcing fillers. Therefore, multilayer thermal shield can be designed with choosing, along with the layer thicknesses, the material structure parameters that are optimal for the specific operating conditions of the spacecraft under development. The article presents an algorithm for optimally designing multilayer thermal insulation based on a carbon cellular material filled with aerogel subject to the dependence of the thermophysical properties on the microstructure of the cellular material. Practical application is illustrated with a problem of designing a three-layer thermal shield for a solar probe.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 4","pages":"722 - 733"},"PeriodicalIF":1.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantum Vortex Tangle Generated by Thermal Activation in Superfluid Liquids 超流体中热激活产生的量子涡旋缠结
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040088
S. K. Nemirovskii, L. P. Kondaurova, D. D. Smirnov
{"title":"Quantum Vortex Tangle Generated by Thermal Activation in Superfluid Liquids","authors":"S. K. Nemirovskii,&nbsp;L. P. Kondaurova,&nbsp;D. D. Smirnov","doi":"10.1134/S1810232824040088","DOIUrl":"10.1134/S1810232824040088","url":null,"abstract":"<p>The article presents the results of a numerical and analytical study of the development of a quantum vortex structure in superfluid helium under the influence of a random Langevin force that simulates thermal excitation. The study focuses on issues related to the density of the vortex tangle and distribution of vortex loops by their sizes, as well as the frequency of reconnections. The analytical part presents two methods to solve the problem: continuous and discrete. Numerical simulation is an important tool for solving the stochastic dynamics of quantum vortex filaments subjected to a random force, which is complex task. A comparison of the respective results is carried out.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 4","pages":"767 - 778"},"PeriodicalIF":1.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 at Evaporation and Boiling of Refrigerant Mixture Film Falling Down a Vertical Heater with a 3D-Printed Dual-Scale Coating 3d打印双刻度涂层垂直加热器下制冷剂混合膜蒸发和沸腾时的传热
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040076
O. A. Volodin, N. I. Pecherkin, D. A. Shvetsov, V. S. Serdyukov, V. P. Bessmeltsev, S. G. Baev, A. N. Pavlenko
{"title":"Heat Transfer at Evaporation and Boiling of Refrigerant Mixture Film Falling Down a Vertical Heater with a 3D-Printed Dual-Scale Coating","authors":"O. A. Volodin,&nbsp;N. I. Pecherkin,&nbsp;D. A. Shvetsov,&nbsp;V. S. Serdyukov,&nbsp;V. P. Bessmeltsev,&nbsp;S. G. Baev,&nbsp;A. N. Pavlenko","doi":"10.1134/S1810232824040076","DOIUrl":"10.1134/S1810232824040076","url":null,"abstract":"<p>In the proposed study, experiments were conducted to investigate heat transfer enhancement during evaporation and boiling of R114-R21 refrigerant mixture film flowing down a vertical surface. To improve heat transfer, a dual-scale coating with macroscale longitudinal ribbing and a microscale porous internal structure of sintered bronze particles was printed by combined SLS/SLM (Selective Laser Sintering/Selective Laser Melting) on a flat rectangular substrate (<span>(70times80)</span> mm). The film Reynolds number ranged from 400 to 1300, indicating a change in the film flow regime from the laminar wave to the undeveloped turbulent one. Heat flux density varied from zero to pre-crisis values. The results showed that the presence of the modulated capillary-porous coating can increase heat transfer at nucleate boiling of the falling film by up to four times as compared to a smooth surface. To evaluate the obtained results, the authors compared them with experimental data previously gathered for a flat 3D-printed capillary-porous coating and a microstructured surface created by deformational cutting. The microcharacteristics of the obtained coating were also compared with the active centre size ranges predicted by models of Hsu and Liu et al.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 4","pages":"750 - 766"},"PeriodicalIF":1.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On Increasing the Efficiency of a Cement Clinker Kiln Using Machine Learning 利用机器学习提高水泥熟料窑效率的研究
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040015
E. B. Butakov, S. S. Abdurakipov, V. Y. Neznamov, S. V. Alekseenko
{"title":"On Increasing the Efficiency of a Cement Clinker Kiln Using Machine Learning","authors":"E. B. Butakov,&nbsp;S. S. Abdurakipov,&nbsp;V. Y. Neznamov,&nbsp;S. V. Alekseenko","doi":"10.1134/S1810232824040015","DOIUrl":"10.1134/S1810232824040015","url":null,"abstract":"<p>The production of cement clinker faces many management challenges, particularly in terms of consistently high product quality, efficient energy usage, and stable furnace operation. In this study, a machine learning model based on gradient boosting was developed for the efficient operation modes of the kiln (required quality and low energy consumption). The influence of process parameters on the efficiency of the clinker kiln was investigated. As a result, it was shown that stable kiln feeding improves the quality of the final product. High feeding variation leads to an increase in the dispersion of the entire setup and attempts to maintain it in a stable state by changing the volume of burned gas. When there is high feeder operation variation, the lime saturation factor has a significant impact on the outcome. The obtained results can be used to create a digital assistant for the kiln operator.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 4","pages":"675 - 682"},"PeriodicalIF":1.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamics of a Momentumless Turbulent Wake Behind a Sphere in a Turbulized Stratified Medium 湍流分层介质中球后无动量湍流尾迹动力学
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040155
G. G. Chernykh, A. V. Fomina, N. P. Moshkin
{"title":"Dynamics of a Momentumless Turbulent Wake Behind a Sphere in a Turbulized Stratified Medium","authors":"G. G. Chernykh,&nbsp;A. V. Fomina,&nbsp;N. P. Moshkin","doi":"10.1134/S1810232824040155","DOIUrl":"10.1134/S1810232824040155","url":null,"abstract":"<p>With application of three-dimensional parabolized system of differential equations including averaged equations of motion in the Oberbeck–Boussinesq approximation and equations for transfer of Reynolds stresses and dissipation rates, a numerical model of the dynamics of a momentumless turbulent wake behind a sphere in a turbulized stratified medium (degenerating external turbulence) was constructed. The components of the mass flow vector and the dispersion of density fluctuations were found from algebraic representations of a locally equilibrium approximation. Numerical simulation of the dynamics of a momentumless turbulent wake behind a sphere and internal waves generated by it in a turbulized linearly stratified medium was performed. The calculation results demonstrate a significant influence of background turbulence on the wake dynamics and internal waves generated by the wake.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 4","pages":"852 - 873"},"PeriodicalIF":1.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Innovative Stainless-Steel Porous Substrate for Metal-Supported Solid Oxide Fuel Cells 金属支撑固体氧化物燃料电池的创新不锈钢多孔衬底
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040167
M. R. Alsayedomar, A. G. Laptev, A. M. Dimiev
{"title":"Innovative Stainless-Steel Porous Substrate for Metal-Supported Solid Oxide Fuel Cells","authors":"M. R. Alsayedomar,&nbsp;A. G. Laptev,&nbsp;A. M. Dimiev","doi":"10.1134/S1810232824040167","DOIUrl":"10.1134/S1810232824040167","url":null,"abstract":"<p>Porous metallic substrate for metal-supported solid oxide fuel cells was developed utilizing stainless-steel powder and triethanolamine as a new binder. Starch was added as an additional agent to increase porosity and gas permeability of the samples. The structure and functional properties of the obtained substrates as the function of the additives content and the processing conditions were investigated. The optimal parameters have been determined. When the combined percentage of the binder and pore-former was raised up to 5%, the porosity and permeability increased up to 46.2% and 3.1 d respectively. As the sintering time of the substrate increased to 6h, the hardness grew up to 311 HRC. A thermal expansion coefficient value of <span>(sim 14times 10^{-6})</span> has been obtained. The results demonstrate how the preparation process affects all of the major parameters, including porosity, permeability, hardness and roughness. Both the content of additives and processing conditions may vary in relatively broad range to attain particular required properties of the substrates. Better to similar properties compared to literature data have been obtained.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 4","pages":"874 - 882"},"PeriodicalIF":1.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Single-Phase Cooling of Large Surface by Water Droplet Flow 利用水滴流对大面积表面进行单相冷却
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030093
A. D. Nazarov, N. B. Miskiv, A. F. Serov, V. N. Mamonov
{"title":"Single-Phase Cooling of Large Surface by Water Droplet Flow","authors":"A. D. Nazarov,&nbsp;N. B. Miskiv,&nbsp;A. F. Serov,&nbsp;V. N. Mamonov","doi":"10.1134/S1810232824030093","DOIUrl":"10.1134/S1810232824030093","url":null,"abstract":"<p>Single-phase heat transfer from a vertical titanium plate with area of 140 mm<sup>2</sup> to a water droplet flow (spray) normal to the surface of the heat exchanger was studied experimentally. Two models of commercial hydraulic full-cone nozzles with different characteristics of flow and spray pattern were used, the average mass flow rate being 2.4 kg/m<sup>2</sup>s to 6.46 kg/m<sup>2</sup>s. The maximum heat flux density of the heater was 204 kW/m<sup>2</sup>. The area-averaged heat transfer coefficient was found to be highly dependent on the mass flow rate of the coolant. The average droplet diameter and the outflow velocity from nozzle openings appear to have secondary influence on single-phase heat transfer.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"536 - 546"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Features of Plasma-Thermal Melting of Ash and Slag from Incineration Plant1 焚烧厂灰渣和炉渣的等离子体热熔特性1
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030159
A. S. Anshakov, O. G. Volokitin, P. V. Domarov
{"title":"Features of Plasma-Thermal Melting of Ash and Slag from Incineration Plant1","authors":"A. S. Anshakov,&nbsp;O. G. Volokitin,&nbsp;P. V. Domarov","doi":"10.1134/S1810232824030159","DOIUrl":"10.1134/S1810232824030159","url":null,"abstract":"<p>The paper focuses on computational and experimental studies of processing ash residues from an incineration plant (IP). To prevent environmental contamination, it is required to melt IP ash and slag to obtain a useful product with neutral properties. Combined heating of ash and slag is proposed, and the time for melting of dispersed particles of silicon dioxide (<span>(alpha)</span> quartz) under the action of arc plasma and resistive heating is calculated.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"637 - 645"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Features of Oxidation of Bismuth by High-Density Water-Oxygen Fluid 高密度水氧流体氧化铋的特征
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030020
O. N. Fedyaeva, A. P. Grebennikov, A. A. Vostrikov
{"title":"Features of Oxidation of Bismuth by High-Density Water-Oxygen Fluid","authors":"O. N. Fedyaeva,&nbsp;A. P. Grebennikov,&nbsp;A. A. Vostrikov","doi":"10.1134/S1810232824030020","DOIUrl":"10.1134/S1810232824030020","url":null,"abstract":"<p>The paper presents the results of a study of oxidation of bulk bismuth samples by oxygen, water vapor, and water-oxygen fluid in a reactor heated to 873 K at a rate of 1 K/min with high-density reagents (<span>(rho_{{rm O_{2}}}le0.62)</span> and <span>(rho_{{rm H_{2}O}}le5.24)</span> mol/dm<sup>3</sup>). The results include temperature dependences of the pressure of the reaction mixtures. The rate of oxygen consumption is found from these dependences through the Redlich–Kwong equation of state. Formation of dense oxide film during the oxidation of bismuth in the O<sub>2</sub> environment was shown. No oxide formation was detected during treatment of bismuth with water vapor. The combined action of O<sub>2</sub> and H<sub>2</sub>O molecules enhances the oxidation of bismuth and leads to formation of oxides of different compositions and morphologies. At <span>(T&gt;720)</span> K, the bismuth oxidation rate was observed to increase due to the higher pressure of saturated bismuth vapor.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"467 - 477"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Implementation of Boundary Conditions on Bubbles in a Microchannel with Stationary Laminar Flow 静止层流微通道中气泡边界条件的数值实现
IF 1.3 4区 工程技术
Journal of Engineering Thermophysics Pub Date : 2024-09-18 DOI: 10.1134/S1810232824030044
D. S. Gluzdov, E. Ya. Gatapova
{"title":"Numerical Implementation of Boundary Conditions on Bubbles in a Microchannel with Stationary Laminar Flow","authors":"D. S. Gluzdov,&nbsp;E. Ya. Gatapova","doi":"10.1134/S1810232824030044","DOIUrl":"10.1134/S1810232824030044","url":null,"abstract":"<p>The paper presents the implementation of a user-defined function (UDF) for the Navier boundary condition in the Fluent software package. The study focuses on a microchannel with a laminar steady flow and a bubble structure on one of the surfaces. The influence of velocity and gradient components on the flow near the boundary is investigated. The numerical solutions obtained in a 2D formulation were verified and compared with experimental data from the literature.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 3","pages":"485 - 493"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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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