Journal of Engineering Thermophysics最新文献_第3页

Droplet Impacts on Cold Cylindrical Copper Surfaces 液滴对冷圆柱形铜表面的冲击

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S181023282404012X

J. J. Tian, M. P. Wu, S. Mehendale, Z. Zhang

{"title":"Droplet Impacts on Cold Cylindrical Copper Surfaces","authors":"J. J. Tian, M. P. Wu, S. Mehendale, Z. Zhang","doi":"10.1134/S181023282404012X","DOIUrl":"10.1134/S181023282404012X","url":null,"abstract":"Currently, we investigate the collision process of water droplets on cold cylindrical copper surfaces by means of a video camera and a cooling testbed. The solidification of water vapor on cold metal surfaces increases the friction of contacting liquids is an unavoidable factor, so we experimented with a uniform atmospheric pressure and relative humidity environment. The paramount purpose of this experiment was to avail oneself of the change in viscosity due to temperature change and the change in radius of copper cylinder to understand its effect on droplet impact conducting heat and freezing. The results show that the substrate viscosity (frost layer) has marginal effect on the time for a droplet to reach maximum diffusion in the two main droplet movement directions. In addition, droplet diffusion on cold cylindrical copper surfaces consists of three processes: spreading stage, transitional stage and steady stage. Among these three phases, power function fitting works best in the spreading stage. Besides, we have used the composite spreading coefficient (gamma) to describe the speed of spreading. For any radius cylinder, the cooler the temperature, the bigger the average value of the composite spreading coefficient (gamma) below 0°C than above 0°C. The larger the composite spreading coefficient (gamma) is, the more slowly the droplet dimensionless spreading arc length changes with dimensionless time. Moreover, droplets between 0°C and −5°C sometimes show post-collision supercooling, which is related to surface viscosity instability and the contribution of surface shape to droplet retraction.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 4","pages":"810 - 832"},"PeriodicalIF":1.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995443","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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Some Features of the Formation of Polycrystalline Conglomerates of Methane Hydrate at the Interface Foam—Solution of Surfactants 表面活性剂界面泡沫溶液中甲烷水合物多晶聚集体形成的若干特征

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040118

T. P. Adamova, A. Y. Manakov, D. S. Elistratov, A. A. Chernov

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Simulation of Heat Transfer during Injection of Annular Gas-Droplet Jet into Turbulent Cross-Flow 湍流横流中环形气滴射流的传热模拟

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040106

M. A. Pakhomov

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Diagnostics of Boiling Crisis 沸腾危机的诊断

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040131

A. V. Reshetnikov, V. G. Pastukhov, V. N. Skokov, A. A. Akashev, A. V. Vinogradov, V. P. Koverda

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Erratum to: Investigation of the Local Equilibrium Approximation in a Planar Momentumless Turbulent Wake in a Passively Stratified Fluid 对被动分层流体中平面无动量湍流尾迹局部平衡近似研究的勘误

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040192

V. N. Grebenev, A. G. Demenkov, G. G. Chernykh

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Erratum to: Analytical Study of Conjugated Heat Transfer of a Microchannel Fluid Flow between Two Parallel Plates 两个平行板间微通道流体流动的共轭传热分析研究

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040180

A. S. Al-shyyab, F. H. Darwish, M. A. Al-Nimr, B. J. Alshaer

引用次数: 0

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}

引用次数: 0

Features of Measurement of Local Parameters of Near-Wall Liquid Films in Supersonic Nozzles 超声速喷管近壁液膜局部参数测量特点

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-01-17 DOI: 10.1134/S1810232824040027

V. N. Yarygin, I. V. Yarygin, V. G. Prikhodko, A. D. Nazarov

引用次数: 0

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

引用次数: 0

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