Journal of Engineering Thermophysics最新文献_第2页

Calculation of Heat Transfer Coefficients in LNG Column LNG塔换热系数的计算

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040039

P. I. Geshev

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Insights into Significance of Radiative Inclined MHD on Mixed Convective Viscoelastic Flow of Hybrid Nanofluid over a Permeable Surface with Mass Transpiration 辐射倾斜MHD对混合纳米流体在具有质量蒸腾的可渗透表面上混合对流粘弹性流动的意义

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040179

G. M. Sachin, T. Maranna, U. S. Mahabaleshwar, L. M. Pérez, D. Laroze, G. Lorenzini

{"title":"Insights into Significance of Radiative Inclined MHD on Mixed Convective Viscoelastic Flow of Hybrid Nanofluid over a Permeable Surface with Mass Transpiration","authors":"G. M. Sachin, T. Maranna, U. S. Mahabaleshwar, L. M. Pérez, D. Laroze, G. Lorenzini","doi":"10.1134/S1810232824040179","DOIUrl":"10.1134/S1810232824040179","url":null,"abstract":"The hybrid nanofluid is extensively used in manufacturing for industrial uses because of its exceptional property of enhancing the heat transfer process. The purpose of the present work is to find novel explanations for the behavior of thermal radiation and inclined magnetohydrodynamics effects on the convective viscoelastic flow of water Al2O3–Cu hybrid nanofluids over an accelerating permeable surface with mass transpiration. The viscoelastic liquid concept is postulated with the benefit of hybrid nanofluids employing conventional flow patterns that are impacted by the magnetic field. Thermophysical properties of Al2O3–Cu and water are employed. Nonlinear PDE for momentum, temperature, and concentration are converted into non-dimensional ODE by employing the proper similarity transformations. The current study is reported to be in very good accordance with earlier research. The velocity field and energy distributions were depicted graphically to show the influence and typical behaviors of physical factors such as the viscoelastic parameter, the Richardson number, the radiation number, etc. In industrial applications, the temperature distribution influenced by radiation is quite important, specifically in accelerated plates where cooling the liquid is necessary to achieve the desired outcome.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 4","pages":"883 - 900"},"PeriodicalIF":1.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994880","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}

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Heat Transfer and Pressure Drop during Circulation of Non-Azeotropic Mixture in Heated Channel with Spiral Intensifiers 螺旋增强剂加热通道中非共沸混合物循环过程中的传热与压降

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040064

V. E. Zhukov, N. N. Mezentseva

{"title":"Heat Transfer and Pressure Drop during Circulation of Non-Azeotropic Mixture in Heated Channel with Spiral Intensifiers","authors":"V. E. Zhukov, N. N. Mezentseva","doi":"10.1134/S1810232824040064","DOIUrl":"10.1134/S1810232824040064","url":null,"abstract":"Mixtures are widely used as refrigerants and coolants in various energy systems. The thermophysical properties of a mixture differ from the properties of its individual components. This paper presents the results of a study of the intensity of heat transfer to a non-azeotropic alcohol-water mixture with a highly volatile component with mass concentration of 30% during forced circulation in a circular channel with spiral intensifiers with a hydrophobic coating. The experiments were carried out in a closed circulation circuit at a pressure of 0.03–0.04 MPa in the storage vessel. The test section was a stainless steel tube 2 m long with internal diameter of 7.6 mm and wall thickness of 0.2 mm. The heating was result of electric current flow in the tube wall. The spiral intensifiers had a winding pitch of 4 mm, and the thickness of the fluoroplastic coating was 0.9 mm. The experiments were carried out at mass flow rates of 36–450 kg/m2. The heat flux density range was (8000 < q < 32000) W/m2. The pressure drop in this test section was measured in single-phase and two-phase flow regimes, and the dynamics of the pressure drop during the formation of a two-phase flow under various operating parameters was shown. The use of the spiral intensifiers with a hydrophobic coating during circulation of the non-azeotropic alcohol-water mixture (30%) in the circular channel at channel wall temperatures below the saturation temperature of this mixture has led to the formation of a significant amount of the vapor-gas phase in the flow. The appearance of the vapor phase in the flow reduced the pressure drop in the heat-release section with the spiral intensifiers. At almost complete transition of the flow into the vapor phase at the outlet from the section, the pressure drop increased tenfold compared to the pressure drop in the liquid phase flow at the same mass velocity of the flow.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 4","pages":"734 - 749"},"PeriodicalIF":1.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995440","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

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, O. M. Alifanov, A. V. Nenarokomov","doi":"10.1134/S1810232824040052","DOIUrl":"10.1134/S1810232824040052","url":null,"abstract":"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.","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}

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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

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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, N. I. Pecherkin, D. A. Shvetsov, V. S. Serdyukov, V. P. Bessmeltsev, S. G. Baev, A. N. Pavlenko","doi":"10.1134/S1810232824040076","DOIUrl":"10.1134/S1810232824040076","url":null,"abstract":"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 ((70times80) 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.","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}

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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

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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

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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, A. G. Laptev, A. M. Dimiev","doi":"10.1134/S1810232824040167","DOIUrl":"10.1134/S1810232824040167","url":null,"abstract":"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 (sim 14times 10^{-6}) 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.","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}

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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

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