International Journal of Thermophysics最新文献_第3页

Experimental Characterization of Magnetic Field Waveform Effects on Heat Transfer and Entropy Generation of ({Fe}_{3}{O}_{4})-MgO 磁场波形对({Fe}_{3}{O}_{4}) -MgO传热和熵产影响的实验表征

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International Journal of Thermophysics Pub Date : 2025-09-12 DOI: 10.1007/s10765-025-03634-1

Victor O. Adogbeji, Tartibu Lagouge

{"title":"Experimental Characterization of Magnetic Field Waveform Effects on Heat Transfer and Entropy Generation of ({Fe}_{3}{O}_{4})-MgO","authors":"Victor O. Adogbeji, Tartibu Lagouge","doi":"10.1007/s10765-025-03634-1","DOIUrl":"10.1007/s10765-025-03634-1","url":null,"abstract":"<div>Magnetic hybrid nanofluids (MHNFs), also known as ferrofluids, exhibit increased efficiency under an appropriate magnetic field. This work explores the effectiveness of heat transfer in MHNFs across various nanoparticle concentrations and magnetic field waveforms in both turbulent and transitional flow regimes. Five nanoparticle volume fractions (0.00625 % to 0.1 %) were tested under square, sine, and triangular magnetic fields across a Reynolds number (Re) spectrum of 1000 to 8000. Compared to DIW in the transitional regime, MHNFs showed up to 5.2 % improvement in the convective heat transfer coefficient at a 0.0125 % volume fraction, with average Nusselt number (Nu) increases of up to 5.1 %. The square wave magnetic field was particularly effective, enhancing performance by 8.8 % at 0.0125 % and 7.9 % at 0.00625 % in the turbulent phase. In the transition phase, Nu enhancements reached up to 31.38 % at 0.0125 % volume fraction without a magnetic field, with the square wave field achieving 36.1 % improvement, a 15.0 % increase compared to the no field case. Triangular waves induced the earliest transition onset at Re 2495.12 for 0.1 % volume fraction. The highest thermal performance factor (TPF) was 1.9789 for the turbulent regime and 4.2297 for the transitional regime. Triangular wave fields were most effective at reducing entropy generation, especially at high velocities.</div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 11","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10765-025-03634-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Measurements of Critical Properties for Binary Mixture of HFO-1234ze(E) + HFC-134a and Ternary Mixture of HFO-1234ze(E) + HFC-134a + HFC-32 HFO-1234ze(E) + HFC-134a二元混合物和HFO-1234ze(E) + HFC-134a + HFC-32三元混合物临界性能的测定

IF 2.9 4区工程技术

International Journal of Thermophysics Pub Date : 2025-09-12 DOI: 10.1007/s10765-025-03644-z

Chang Xu, Qi Chen, Nan Zhang, Peng Hu

{"title":"Measurements of Critical Properties for Binary Mixture of HFO-1234ze(E) + HFC-134a and Ternary Mixture of HFO-1234ze(E) + HFC-134a + HFC-32","authors":"Chang Xu, Qi Chen, Nan Zhang, Peng Hu","doi":"10.1007/s10765-025-03644-z","DOIUrl":"10.1007/s10765-025-03644-z","url":null,"abstract":"<div>The critical properties of the binary mixture of trans-1,3,3,3-Tetrafluoropropene (HFO-1234ze(E)) + 1,1,1,2-tetrafluoroethane (HFC-134a) and ternary mixture of HFO-1234ze(E) + HFC-134a + difluoromethane (HFC-32) were measured by an apparatus with variable volume. The critical properties of refrigerants can be determined by visually observing the critical opalescence phenomenon and reappearance of the meniscus. The combined expanded measurement uncertainties of the critical temperature, critical pressure and mole fraction were estimated to be less than 57 mK, 23 kPa, and 0.015 (k = 2, 0.95 level of confidence), respectively. The saturated vapor pressures and critical properties of pure HFO-1234ze(E) and HFC-134a were measured to verify the reliability of the apparatus. Redlich–Kister equations were used to correlate the critical properties of HFO-1234ze(E) + HFC-134a and the results were in good agreement with the experimental data. Cibulka’s equations were used to correlate the critical properties of HFO-1234ze(E) + HFC-134a + HFC-32 and the critical surfaces were plotted using Cibulka’s equations.</div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 11","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037084","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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Influence of Nanoparticle Concentration on the Force Generated by a Nanofluid Free Jet Impacting a Stationary Obstacle, with Emphasis on Ionic Liquid-Based Nanofluids 纳米颗粒浓度对纳米流体自由射流冲击静止障碍物所产生力的影响，重点研究基于离子液体的纳米流体

IF 2.9 4区工程技术

International Journal of Thermophysics Pub Date : 2025-09-09 DOI: 10.1007/s10765-025-03642-1

Saša Laloš, Siniša Bikić, Snežana Papović, Milivoj Radojčin, Ivan Pavkov, Rafat Al Afif, Christian Schröder, Milan Vraneš

{"title":"Influence of Nanoparticle Concentration on the Force Generated by a Nanofluid Free Jet Impacting a Stationary Obstacle, with Emphasis on Ionic Liquid-Based Nanofluids","authors":"Saša Laloš, Siniša Bikić, Snežana Papović, Milivoj Radojčin, Ivan Pavkov, Rafat Al Afif, Christian Schröder, Milan Vraneš","doi":"10.1007/s10765-025-03642-1","DOIUrl":"10.1007/s10765-025-03642-1","url":null,"abstract":"<div>Nanofluids, colloidal suspensions of nanoparticles in a base fluid, have garnered significant research interest over the past two decades due to their potential as efficient heat transfer fluids in heat exchangers. Particularly interesting are nanofluids with nowadays very popular ionic liquids as base fluids. Understanding the behavior of nanofluids under forced convection in these systems is crucial, yet many studies have overlooked the impact on other system components. Our study focuses on the load exerted on system components by nanofluids. Specifically, we examined how varying nanoparticle concentrations influence the force exerted by the free jet flow of nanofluids on stationary obstacles. This aspect is critical as increased nanoparticle concentration generally leads to higher fluid density, potentially increasing the load on the system parts. Our findings indicate a correlation between nanoparticle concentration and the force exerted by the nanofluid's free jet flow on stationary obstacles. As the density of the nanofluid increases with higher nanoparticle concentration, so does the force exerted, confirming that the suspension of nanoparticles elevates the burden on system components. For illustrative purposes, at a temperature of 303.15 K and a nanoparticle mass concentration of 2.5 wt% in the Al2O3/[C4mim][NTf2] nanofluid, the relative increase in the force exerted by the free nanofluid jet on the stationary obstacle was approximately 5.7%. Further research into nanofluids' broader impacts is essential. Understanding these dynamics is crucial for optimizing their applications. Continued investigation into their mechanical and thermophysical effects is recommended to ensure efficient and safe integration into future technologies.</div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 11","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021662","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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Effect of Pyrolysis Derived Coconut Shell Biochar on the Mechanical, Thermal, Rheological, and Water Absorption Properties of PLA Composites 热解衍生椰壳生物炭对PLA复合材料力学、热、流变和吸水性能的影响

IF 2.9 4区工程技术

International Journal of Thermophysics Pub Date : 2025-09-09 DOI: 10.1007/s10765-025-03637-y

Santosh Kumar Sahu, P. S. Rama Sreekanth, A. Praveen Kumar, Ali El-Rayyes, Nadir Ayrilmis

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High-Speed Shadowgraph Imaging for Measuring the Thermal Expansion of Niobium Under Pulsed-Current Heating Beyond 2000 K 测量铌在超过2000k的脉冲电流加热下热膨胀的高速影影成像

IF 2.9 4区工程技术

International Journal of Thermophysics Pub Date : 2025-09-09 DOI: 10.1007/s10765-025-03636-z

Isamu Orikasa, Hiromichi Watanabe

{"title":"High-Speed Shadowgraph Imaging for Measuring the Thermal Expansion of Niobium Under Pulsed-Current Heating Beyond 2000 K","authors":"Isamu Orikasa, Hiromichi Watanabe","doi":"10.1007/s10765-025-03636-z","DOIUrl":"10.1007/s10765-025-03636-z","url":null,"abstract":"<div>A high-speed shadowgraph technique was developed to measure the linear thermal expansion of metallic solids up to approximately 2400 K during pulsed-current heating in vacuum. Niobium coupon specimens (3 mm × 100 mm × 0.5 mm) were resistively heated with a direct current of over 100 A for up to 2.3 s. The system incorporates a 405 nm bandpass filter, a Type-C thermocouple welded to the specimen surface, and a high-speed CMOS camera to enable high-contrast silhouette imaging under intense thermal radiation emitted by the specimen. Specimen elongation was determined by subpixel contour extraction of silhouette images, and the specimen temperature was recorded via the welded thermocouple. The relative linear thermal expansion (ε) and average coefficients of thermal expansion (α) were determined at three temperatures, yielding a maximum ε of 1.87 × 10–2 between 334 K and 2352 K and a corresponding α of 9.28 × 10–6 K−1 at a mean temperature of 1343 K. In all three cases, the relative deviations from literature values were less than 1.2 × 10–7 K−1, which fall within the combined standard uncertainty of up to 1.83 × 10–7 K⁻1 (1.97%).</div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 11","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021663","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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2, 2, 3, 3, 4, 4, 4-Heptafluoro-1-Butanol and 2, 2, 3, 3, 4, 4, 4-Heptafluorobutyl Acetate: Physicochemical, Thermophysical, and Spectral Data 2,2,3,3,4,4,4 -七氟-1-丁醇和2,2,3,3,3,4,4,4 -七氟-乙酸丁酯：物理化学、热物理和光谱数据

IF 2.9 4区工程技术

International Journal of Thermophysics Pub Date : 2025-09-08 DOI: 10.1007/s10765-025-03640-3

Andrei V. Polkovnichenko, Evgenia I. Kovaleva, Alexey V. Kisel’, Sergey Ya. Kvashnin, Maria V. Mironova, Egor V. Lupachev

{"title":"2, 2, 3, 3, 4, 4, 4-Heptafluoro-1-Butanol and 2, 2, 3, 3, 4, 4, 4-Heptafluorobutyl Acetate: Physicochemical, Thermophysical, and Spectral Data","authors":"Andrei V. Polkovnichenko, Evgenia I. Kovaleva, Alexey V. Kisel’, Sergey Ya. Kvashnin, Maria V. Mironova, Egor V. Lupachev","doi":"10.1007/s10765-025-03640-3","DOIUrl":"10.1007/s10765-025-03640-3","url":null,"abstract":"<div>New physicochemical data for 2, 2, 3, 3, 4, 4, 4-heptafluoro-1-butanol (≥ 0.998 mass fr.) and 2, 2, 3, 3, 4, 4, 4-heptafluorobutyl acetate (≥ 0.994 mass fr.) are presented. The dependences of the saturated vapor pressure of 2, 2, 3, 3, 4, 4, 4-heptafluoro-1-butanol and 2, 2, 3, 3, 4, 4, 4-heptafluorobutyl acetate on temperature were obtained. The coefficients of Antoine’s equation are calculated based on the experimental temperature–pressure dependence data. This article also presents data on the rheological properties (viscosity and apparent activation energy for the viscous flow) of the studied compounds. The dependencies of refractive index and excess volume (density) on temperature are studied. Fourier transform infrared spectroscopy spectra are also provided. The experimental data presented in this paper extend and complement the information presented in the scientific literature. These data are background information and a starting point for further research in engineering design of chemical processing equipment. In addition, the received data may support the development of property models of pure substances and systems containing them, such as phase behavior and the processes underlying it.</div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 11","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145007912","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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Correction: Thermophysical Properties of Alkali Metals: A Partition Function Theory Approach Including Low-Lying Electronic States 修正：碱金属的热物理性质：包括低洼电子态的配分函数理论方法

IF 2.9 4区工程技术

International Journal of Thermophysics Pub Date : 2025-09-03 DOI: 10.1007/s10765-025-03639-w

Carlos D. da Silva, Marcos D. S. Alves, Ramon S. da Silva, Maikel Y. Ballester

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A Novel Model Fusing ALA and Integrated Learning: Temperature Compensation for 700 kPa Pressure Scanners 一种融合ALA和集成学习的新模型：700 kPa压力扫描仪的温度补偿

IF 2.9 4区工程技术

International Journal of Thermophysics Pub Date : 2025-09-01 DOI: 10.1007/s10765-025-03638-x

Huan Wang, Xinxin Chen, Jiaxu Xia, Pan Liu, Hongchao Zhao

{"title":"A Novel Model Fusing ALA and Integrated Learning: Temperature Compensation for 700 kPa Pressure Scanners","authors":"Huan Wang, Xinxin Chen, Jiaxu Xia, Pan Liu, Hongchao Zhao","doi":"10.1007/s10765-025-03638-x","DOIUrl":"10.1007/s10765-025-03638-x","url":null,"abstract":"<div>The pressure scanner, as a highly integrated multi-channel pressure acquisition device, plays a crucial role in the high-precision measurement process. However, since pressure scanners are extremely sensitive to ambient temperature, improper calibration may directly affect the accuracy of pressure data. Therefore, the use of accurate temperature compensation algorithms is particularly important for pressure scanners. This study proposes a novel hybrid temperature compensation algorithm that combines the advantages of the Extreme Gradient Boosting (XGBoost) model in integrated learning and the artificial lemming algorithm (ALA). The algorithm is validated using experimental data obtained from a self-built calibration system. A side-by-side comparison is made with other machine learning models such as Random Forest (RF), Support Vector Regression (SVM), and XGBoost. The results show that the ALA-XGBoost model performs well with R2 of 0.99951, RMSE of 0.0226, and full-scale error of only 0.081 % FS. The results validate the feasibility and effectiveness of the integrated learning model for pressure scanners temperature compensation applications.</div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 11","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923181","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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Investigation on the Thermal Conductivity of the Molten Copper Slag Cooling and Solidification Process 铜渣冷却凝固过程导热系数的研究

IF 2.9 4区工程技术

International Journal of Thermophysics Pub Date : 2025-08-29 DOI: 10.1007/s10765-025-03633-2

Siyu Chen, Ruijin Fan, Ruinan Zhu, Jianhang Hu, Hua Wang

{"title":"Investigation on the Thermal Conductivity of the Molten Copper Slag Cooling and Solidification Process","authors":"Siyu Chen, Ruijin Fan, Ruinan Zhu, Jianhang Hu, Hua Wang","doi":"10.1007/s10765-025-03633-2","DOIUrl":"10.1007/s10765-025-03633-2","url":null,"abstract":"<div>The slow cooling of ladle slag during copper smelting offers broad potential for recovering valuable metals. Thermal conductivity is a key parameter influencing the slag’s cooling rate. However, limited research on the thermal conductivity of copper slag constrains the development of effective cooling strategies. This study systematically investigates the effects of temperature, chemical composition, and microstructure on the thermal conductivity of the SiO2–FeO–Al2O3–MgO–CaO-based copper slag using laser flash analysis. As the slag cooled from 1523 K to 1398 K, 723 K, and 323 K, the corresponding thermal conductivities were 0.3594, 0.8046, 0.7085, and 0.9388 W/(m·K), respectively. Increasing SiO2 (from 31.44 wt.% to 45 wt.%) and Al2O3 (from 4.24 wt.% to 12 wt.%) promoted melt polymerization, enhancing thermal conductivity at 1523 K by 27–63% and 4–26 %, respectively. By contrast, increasing the Fe/SiO2 ratio (from 1.25 to 1.6) and CaO content (from 2.88 wt.% to 11 wt.%) induced depolymerization, decreasing thermal conductivity by 7–34% and 4–10%, respectively. Increasing MgO content (from 3.1 wt.% to 11 wt.%) elevated the melting point, improving thermal conductivity by 1–37 %. The impact of the crystallization of copper slag by increasing the content of SiO2, Al2O3, MgO, and CaO resulted in a decrease in thermal conductivity of solid slag by 4–31 %, whereas FeO allowed an increase in thermal conductivity by 12–88 %. These findings provide a theoretical basis for optimizing the cooling process of copper slag in industrial applications.</div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 11","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914750","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 in a Supercritical-Pressure Liquid Under Pulse Heating: Model for a Wide Range of Pressures and Temperatures 脉冲加热下超临界压力液体的传热：大范围压力和温度的模型

IF 2.9 4区工程技术

International Journal of Thermophysics Pub Date : 2025-08-29 DOI: 10.1007/s10765-025-03635-0

A. V. Melkikh, S. B. Ryutin, P. V. Skripov

{"title":"Heat Transfer in a Supercritical-Pressure Liquid Under Pulse Heating: Model for a Wide Range of Pressures and Temperatures","authors":"A. V. Melkikh, S. B. Ryutin, P. V. Skripov","doi":"10.1007/s10765-025-03635-0","DOIUrl":"10.1007/s10765-025-03635-0","url":null,"abstract":"<div>This study is devoted to extending our insights into peculiarities of the heat conduction of supercritical (SC) fluids in the course of rapid (due to the high heat generation power in the wire probe) transition of compressed fluid to the SC state along the isobar. The comparison is performed with respect to the thermal picture known from quasi-static experiments, where molecular thermal conductivity is usually masked by convection. The task was to construct a physical model explaining the experimental feature discovered in short-term experiments, namely, the threshold increases in the thermal resistance of the fluid boundary layer when crossing the vicinity of the critical/pseudocritical temperature. Its novelty is based on covering the range of significant deviations of the SC-parameters, namely, pressure (in statics, up to 6 p/pc) and temperature (in pulse, up to 1.4 T/Tc), from the corresponding critical values (pc, Tc). The model is verified by comparing its results with the data of a pulse experiment using two essentially different trajectories of penetration into the region of SC-temperatures. The developed model draws attention to potential hazards accompanying heat transfer to SC-fluids in processes with powerful heat generation, typical of a number of modern devices.</div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914660","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