Journal of Engineering Thermophysics最新文献_第8页

Role of Wipers in Heat-and-Mass Transfer during Distillation 刮刀在蒸馏过程传热传质中的作用

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-10-16 DOI: 10.1134/S1810232825020055

I. I. Gogonin

引用次数: 0

Isothermal Evaporation of a Thin Liquid Droplet on Porous Surfaces: Measurements of Thicknesses by the Schlieren Method 多孔表面上薄液滴的等温蒸发：用纹影法测量厚度

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-10-16 DOI: 10.1134/S1810232825020079

Yu. A. Peschenyuk, G. Ye. Ayvazyan, A. A. Semenov, M. S. Lebedev, E. Ya. Gatapova

引用次数: 0

Heat Transfer and Pressure Drop in Water Circulation in Heated Channel with Spiral Intensifiers with Hydrophobic Coating 疏水涂层螺旋增强剂加热通道中水循环的传热与压降

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-10-16 DOI: 10.1134/S1810232825020109

V. E. Zhukov, N. N. Mezentseva

{"title":"Heat Transfer and Pressure Drop in Water Circulation in Heated Channel with Spiral Intensifiers with Hydrophobic Coating","authors":"V. E. Zhukov, N. N. Mezentseva","doi":"10.1134/S1810232825020109","DOIUrl":"10.1134/S1810232825020109","url":null,"abstract":"Various types of passive heat transfer intensifiers are used in channel heat exchangers to increase the heat transfer coefficient. Both insert structures (spirals, twisted tapes, and discrete turbulators) and mechanical or chemical modification of the channel wall (corrugation and deposition of coatings with specified properties) are applied. This paper presents the results of investigation into heat transfer rate at forced circulation of water in a circular channel with spiral intensifiers with hydrophobic coating. The experiments were conducted on a closed circulation circuit at a pressure in the storage vessel of 0.03–0.04 MPa. The test section was a stainless steel tube with length of 2 m, inner diameter of 7.6 mm, and wall thickness of 0.2 mm. Heating was due to electric current flow in the tube wall. The spiral intensifiers have a winding pitch of 4 mm; the fluoroplastic sleeve thickness was 0.9 mm. The experiments were conducted at mass velocities of 35–466 kg/m({}^{2}). The range of heat flux density was (8000<q<32,000) W/m({}^{2}). Measurements of pressure drop across this test section in the regimes of single-phase and two-phase flows were carried out, and the dynamics of pressure drop during formation of two-phase flow at different regime parameters was shown.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 2","pages":"333 - 345"},"PeriodicalIF":1.4,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145296868","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

Prediction of Void Fraction in Sub-Cooled Flow Boiling at High Pressure Using Distribution Parameter Correlations 利用分布参数相关性预测高压下过冷流动沸腾中的空隙率

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-04-18 DOI: 10.1134/S1810232825010126

C. J. Odii, A. G. Korotkikh

{"title":"Prediction of Void Fraction in Sub-Cooled Flow Boiling at High Pressure Using Distribution Parameter Correlations","authors":"C. J. Odii, A. G. Korotkikh","doi":"10.1134/S1810232825010126","DOIUrl":"10.1134/S1810232825010126","url":null,"abstract":"In this work, the void fraction based on the Zuber and Findlay model is evaluated at onset of nucleate boiling (ONB) using the Delhaye et al expression of true quality and onset of significant void (OSV) using the Manon expression of true quality. The distribution parameter correlations of Hancox–Nicoll, Nabizadeh, DIX and a data fitting distribution parameter correlation from the DEBORA experiment which was extended for light water were considered. The numerical modeling of the forced convective subcooled boiling water was done at the pressures and mass fluxes of 12.5 MPa and 2800 kg m(^{-2}) s(^{-1}), 15.7 MPa and 3600 kg m(^{-2}) s(^{-1}), and 16.2 MPa and 3836 kg m(^{-2}) s(^{-1}), respectively, corresponding to the operating parameters of pressurized water reactors (PWRs). The result of the calculation indicates that the Dix and Nabizadeh distribution parameters highly deviated from the DEBORA fitted data prediction at the pressure and mass flux range used, and both distribution parameters almost overlapped in their prediction of void fraction at 16.2 MPa. Within the pressure and mass flux range used for this calculation, the Hancox and Nicoll distribution parameter predicted void fraction were below the DEBORA fitted data prediction and deviation increased as pressure and mass flux decreased.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 1","pages":"133 - 149"},"PeriodicalIF":1.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848923","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 Universal Velocity Profile of Turbulent Flow in Round Pipe 圆管内紊流的通用速度分布

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-04-18 DOI: 10.1134/S1810232825010047

N. I. Yavorsky

引用次数: 0

Experiments on Condensation Heat Transfer and Frictional Pressure Drop of Zeotropic Mixtures R245fa/R1234ze(E) Inside Horizontal Micro-Fin Tubes 水平微翅片管内共沸混合物R245fa/R1234ze(E)的冷凝换热及摩擦压降实验

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-04-18 DOI: 10.1134/S1810232825010138

Y. Liu

{"title":"Experiments on Condensation Heat Transfer and Frictional Pressure Drop of Zeotropic Mixtures R245fa/R1234ze(E) Inside Horizontal Micro-Fin Tubes","authors":"Y. Liu","doi":"10.1134/S1810232825010138","DOIUrl":"10.1134/S1810232825010138","url":null,"abstract":"This study addresses the urgent need to reduce greenhouse gases by investigating high-temperature heat pump systems and binary organic Rankine cycle generators that utilize low-temperature industrial waste heat. Traditionally, R245fa has been used in these systems due to its low working pressure and high critical temperature. However, its high Global Warming Potential necessitates a transition to alternative refrigerants. This research focuses on the heat transfer and pressure drop characteristics of the R245fa/R1234ze(E) refrigerant mixture, a promising alternative with a lower GWP. Experiments were conducted using horizontal micro-fin tubes with copper test tubes of 9.52 mm outer diameter, varying fin heights and numbers, under mass velocities of 100 and 200 kgm(^{-2})s(^{-1}) and mass fractions of 90/10, 80/20, and 65/35 (R245fa/R1234ze(E)) at an average saturation temperature of 60°C. The results showed that the R245fa/R1234ze(E) mixture had lower condensation heat transfer coefficients and frictional pressure drops compared to pure R245fa. The minimum heat transfer coefficient occurred at a 65/35 mass % mass mixture, which is close to the point where the largest temperature glide appeared. Additionally, the frictional pressure drop decreased with increasing mass fractions of R1234ze(E). These findings suggest that the R245fa/R1234ze(E) mixture, despite its lower heat transfer performance compared to pure R245fa, presents a viable lower-GWP alternative for high-temperature heat pump and binary generation systems. This contributes to the development of more efficient and environmentally friendly refrigerant systems, supporting global efforts to reduce greenhouse gas emissions. Further research is needed to optimize the performance of these mixtures in practical applications.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 1","pages":"150 - 161"},"PeriodicalIF":1.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848924","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

Study on the Effect of Equal Volume Filled Copper Foam on Radiator Temperature 等体积填充泡沫铜对散热器温度影响的研究

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-04-18 DOI: 10.1134/S1810232825010163

Z. Zhang, S. Q. Wang, S. Mehendale, J. J. Tian

{"title":"Study on the Effect of Equal Volume Filled Copper Foam on Radiator Temperature","authors":"Z. Zhang, S. Q. Wang, S. Mehendale, J. J. Tian","doi":"10.1134/S1810232825010163","DOIUrl":"10.1134/S1810232825010163","url":null,"abstract":"In this study, copper foam with varying filling rates (porosity of 95% and pore density of 20 ppi) was combined with paraffin wax and integrated into a heat sink to investigate temperature fluctuations within the heat sink after charging and discharging of copper foam phase change materials (PCM) and an empty heat sink with varying filling rates. The study focused on three key PCMs: RT-42HC, RT-50HC, and RT-60HC. The PCMs had copper foam filling ratios of (psi=0.18), (psi=0.37), and (psi=0.55), with three heating loads (0.9 kW/m2, 1.8 kW/m2, and 2.7 kW/m2). The data suggest that after 90 minutes of charging, RT-42HC ((psi=0.37)) can decrease the baseline temperature by 20.29% at 0.9 kW/m2 and a maximum of 35.49% with a foam filling ratio of (psi=0.18). Under a heating load of 2.7 kW/m2, RT-50HC ((psi=0.18)) can reduce the baseline temperature by up to 35.49%. At the same load, RT-50HC ((psi=0.18)) can reduce the reference temperature by 32.45%.RT-42HC ((psi=0.55)) has a maximum enhancement ratio of 4.38 at SPT = 50° and a heating load of 18 W, whereas RT-50HC ((psi=0.55)) has a maximum enhancement ratio of 4.3 at SPT=60° and a load of 27 W. In the cycle test with an 18 W heating load, RT-42HC ((psi=0.37)) had the most favorable influence, lowering the reference temperature by a maximum of 21.94%.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 1","pages":"208 - 226"},"PeriodicalIF":1.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848974","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

Influence of Optical Properties of Two-Phase Medium on Intensity of Melting of Layer of Cloudy Ice 两相介质光学性质对云雾冰层熔化强度的影响

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-04-18 DOI: 10.1134/S1810232825010096

S. D. Sleptsov, N. A. Savvinova

引用次数: 0

Numerical Investigation of Hybrid TiO2-Water Nano-Fluid with Heat Source and Induced Magnetic Field 热源和感应磁场作用下tio2 -水纳米混合流体的数值研究

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-04-18 DOI: 10.1134/S1810232825010175

Pratibha Bhoi, Arjun Agrawal, J. P. Panda

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Using CO2 Hydrate and Air Flow to Extinguish Flame from Wood Materials 利用二氧化碳水合物和气流扑灭木质材料中的火焰