High Temperatures-high Pressures最新文献_第2页

Normal spectral emissivity and heat capacity of Pd–Fe melts measured at constant pressure under electromagnetic levitation with a static magnetic field 静磁场下电磁悬浮恒压下Pd-Fe熔体的法向发射率和热容量的测量

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI: 10.32908/hthp.v52.1423

M. Watanabe, M. Adachi, M. Uchikoshi, H. Fukuyama

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Preface: 13th Asian Thermophysical Properties Conference (ATPC2022) 第13届亚洲热物性会议(ATPC2022)

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI: 10.32908/hthp.v52.1487

H. Kobatake, Sohei Sukenaga, H. Fukuyama

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Viscosity of molten Cu–M alloys (M = Ni, Al) Cu-M合金(M = Ni, Al)熔融粘度

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI: 10.32908/hthp.v52.1365

O. Takeda, Noritaka Ouchi, Kounosuke Takagi, Y. Sato, Hogmin Zhu

{"title":"Viscosity of molten Cu–M alloys (M = Ni, Al)","authors":"O. Takeda, Noritaka Ouchi, Kounosuke Takagi, Y. Sato, Hogmin Zhu","doi":"10.32908/hthp.v52.1365","DOIUrl":"https://doi.org/10.32908/hthp.v52.1365","url":null,"abstract":"The viscosities of the molten Cu–Ni and Cu–Al alloys were measured using an oscillating crucible method over the entire composition range to obtain reliable data and examine composition dependence precisely. The measured viscosities of all alloys showed good consistency in heating and cooling processes, and the logarithmic viscosities showed good Arrhenius-type linearity, indicating that no considerable change in the liquid structure occurs in the temperature range studied. The composition dependence of the viscosity of Cu–Ni alloys was close to that defined by the additive law of logarithmic viscosities of pure components, whereas the composition dependence of the viscosity of Cu–Al alloys was far from that defined by the additive law, where the logarithmic viscosity increased with the addition of a small amount of Al and showed a peak. Over the peak concentration, the logarithmic viscosity monotonically decreased with further addition of Al. Deviations from the additive law of logarithmic viscosity of molten Cu–Al alloys at 1773 K were maximum at low Al concentrations; in contrast, the excess molar volumes of Cu–Al alloys showed minimum at low Al concentrations. The increase in viscosity in the low-Al-concentration region of the Cu–Al alloy is attributed to the decrease in the interatomic distance, which reduces the freedom of movement of atoms.","PeriodicalId":12983,"journal":{"name":"High Temperatures-high Pressures","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69443190","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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Thermophysical properties of molten (Fe2O3)0.95-(SiO2)0.05 measured by aerodynamic levitation 用空气动力学悬浮法测定了熔融(Fe2O3)0.95-(SiO2)0.05的热物理性质

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI: 10.32908/hthp.v52.1405

Toshiki Kondo, T. Toda, J. Takeuchi, S. Kikuchi, F. Kargl, H. Muta, Y. Ohishi

{"title":"Thermophysical properties of molten (Fe2O3)0.95-(SiO2)0.05 measured by aerodynamic levitation","authors":"Toshiki Kondo, T. Toda, J. Takeuchi, S. Kikuchi, F. Kargl, H. Muta, Y. Ohishi","doi":"10.32908/hthp.v52.1405","DOIUrl":"https://doi.org/10.32908/hthp.v52.1405","url":null,"abstract":"In order to establish an evaluation method/numerical simulation for nuclear reactor safety under severe accidental conditions, it is necessary to obtain the physical properties of the relevant molten materials at very high temperatures. In particular, the reaction/interaction between the melt of stainless-steel oxide originating from the nuclear reactor component and the composition of structural concrete is an important phenomenon in terms of understanding of the progress of severe accidents in nuclear power plants and the planning/installation of equipment/devices as countermeasures. The installation of a core catcher is one possible countermeasure to safely terminate a severe accident. For this to work a sacrificial material is placed in the core catcher to increase the fluidity of the molten material. Iron oxide (Fe2O3) is considered a promising candidate. In this study, thermophysical properties such as the density and the viscosity of a (Fe2O3)0.95-(SiO2)0.05 mixture were obtained using the aerodynamic levitation method. The chosen composition is representative for the Molten-Core-Concrete-Interaction at early stages of a severe accident event. Although partial Fe2O3 changes to Fe3O4 during the experiment, this composition change would occur under the actual severe accident conditions. The physical property values of the (Fe2O3)0.95-(SiO2)0.05 mixture were almost the same as those of Fe2O3 obtained in an earlier study. Therefore, it can be concluded that the fluidity of Fe2O3 is not significantly affected in the early stages of a severe accident whereby small amounts of SiO2 (approximately 5 mol. %) are dissolved into Fe2O3.","PeriodicalId":12983,"journal":{"name":"High Temperatures-high Pressures","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69443234","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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Quantitative thermal investigation of a fayalite particle and a Si-rich layer in oxide scale formed on steel 钢表面形成的铁矾石颗粒和富硅氧化层的定量热研究

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI: 10.32908/hthp.v52.1409

Yuto Suganuma, Saori Shinohara, Y. Inoue, T. Nishi, H. Ohta, Hiroshi Tanei, M. Susa, R. Endo

{"title":"Quantitative thermal investigation of a fayalite particle and a Si-rich layer in oxide scale formed on steel","authors":"Yuto Suganuma, Saori Shinohara, Y. Inoue, T. Nishi, H. Ohta, Hiroshi Tanei, M. Susa, R. Endo","doi":"10.32908/hthp.v52.1409","DOIUrl":"https://doi.org/10.32908/hthp.v52.1409","url":null,"abstract":"Fayalite (Fe2SiO4) is a major component of olivine and is often formed in the surface oxide layer (oxide scale) on steel plates owing to its high-temperature oxidation. The thermal conductivity of the oxide scale and its constituents, including fayalite, is essential for controlling the cooling rate of hot steel plates. Therefore, this study uses modulated thermoreflectance microscopy to determine the thermal effusivity/conductivity of fayalite particles with diameters smaller than 180 μm because the sample commercially available is such a small size. This thermal optical microscopy enables the measurement of thermal effusivity for small areas, such as 10 μm. The thermal effusivity and conductivity were found to be 4.1 ± 0.2 kJs-0.5K-1m-2 and 6.0 ± 0.5 Wm-1K-1, respectively. These values are representative of the bulk value. Additionally, the thermal conductivity of fayalite is shown to be higher than that of wüstite (Fe1-xO), which is the main component of the oxide scale. The oxide scale formed on the thick steel plate comprises a Si-rich layer, a wüstite layer, and a magnetite layer. Furthermore, the Si-rich layer comprises fayalite, wüstite, and pores. The effective thermal conductivity of the Si-rich layer was calculated by observing the oxide scale formed on the steel plate. The low thermal conductivity of the Si-rich layer indicates that the thermal conductivity of the layer is strongly affected by the porosity of the oxide scale. Furthermore, although the Si-rich layer is thin, it significantly contributes to the heat resistance of the oxide scale.","PeriodicalId":12983,"journal":{"name":"High Temperatures-high Pressures","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69443252","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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Dual-wavelength reflectance-ratio method for emissivity-free temperature measurements applied to electromagnetically levitated liquid Ni 电磁悬浮液态镍无发射率温度测量的双波长反射率比法

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI: 10.32908/hthp.v52.1431

H. Kobatake, Masaya Iwabuchi, Yuma Kurokawa, M. Ohtsuka, M. Adachi, H. Fukuyama, N. Sasajima, Yoshiro Yamada

{"title":"Dual-wavelength reflectance-ratio method for emissivity-free temperature measurements applied to electromagnetically levitated liquid Ni","authors":"H. Kobatake, Masaya Iwabuchi, Yuma Kurokawa, M. Ohtsuka, M. Adachi, H. Fukuyama, N. Sasajima, Yoshiro Yamada","doi":"10.32908/hthp.v52.1431","DOIUrl":"https://doi.org/10.32908/hthp.v52.1431","url":null,"abstract":"The applicability of the dual-wavelength reflectance-ratio (DWR) method to emissivity-free radiation thermometry of electromagnetically levitated high-temperature liquid metals was investigated. To establish the measurement technique, the DWR method was applied to liquid Ni levitated in a static magnetic field, which suppresses the surface oscillation and the translational motion. In a previous study, temperature of the levitated liquid metals measured by DWR showed deviations of about 95 K to 175 K from the temperature measured by a calibrated pyrometer. Since this discrepancy could be attributed to the imperfect contribution of the auxiliary light, the effect of the optical setup of the auxiliary light on the temperature measurement was investigated in this study. By using a reflecting collimator for the auxiliary optical system and adopting the radiance ratio determined considering the geometrical arrangement of the measurement system, the difference between temperature of liquid Ni kept near its melting temperature (𝑇𝑚 = 1728 K) measured using DWR and the temperature measured by a pyrometer calibrated using the melting point of Ni was 12 K on average and the standard deviation in the temperature measurement was 25 K (𝑛 = 5).","PeriodicalId":12983,"journal":{"name":"High Temperatures-high Pressures","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69443691","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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Structural, elastic and thermodynamic properties of the binary precipitates γ-TiAl, DO22-Al3Ti and α2-Ti3Al γ-TiAl、DO22-Al3Ti和α2-Ti3Al二元相的结构、弹性和热力学性质

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI: 10.32908/hthp.v52.1133

Lili Liu, Cai Chen, Linlin Shen, Gang Xu, Y. Wen, Xianshi Zeng

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Strain and magnetic field effect on thermodynamic properties of a two dimensional GaAs quantum dot 应变和磁场对二维砷化镓量子点热力学性质的影响

4区工程技术

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI: 10.32908/hthp.v52.1391

Ahmad Ghanbari

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Study of size effect on thermophysical properties of metallic nanosolids 金属纳米固体热物理性质的尺寸效应研究

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI: 10.32908/hthp.v52.1305

M. Goyal

{"title":"Study of size effect on thermophysical properties of metallic nanosolids","authors":"M. Goyal","doi":"10.32908/hthp.v52.1305","DOIUrl":"https://doi.org/10.32908/hthp.v52.1305","url":null,"abstract":"In the present study, a phenomenological model based on thermodynamic variables is developed to study the thermophysical properties of nanomaterials with respect to size in nanoscale. The model input parameters are lattice packing fraction depending on crystal structure and atomic diameter of nanosolid. The shape parameter is incorporated in the model to study the variation in physical properties of metallic nanosolids with shape. The size and shape effect on melting temperature 𝑇𝑀𝑁, Debye temperature θ𝐷𝑁, Specific heat capacity 𝐶𝑁, thermal conductivity 𝐾𝑁 and electrical conductivity σ𝑁 is studied in metallic nanosolids. It is observed from the results obtained that both melting temperature and Debye temperature get reduced with reduction in size of nanosolid. Also Thermal conductivity and electrical conductivity in nanosolids decrease as size reduces. This is due to the increase in the number of surface atoms with size reduction and pronounced quantum confinement in nanomaterials. Also, the drastic change in number of surface atoms with the change in shape of the nanomaterial of same size brings about change in its thermophysical properties. The present model results are found consistent with the available experimental and simulated results of previous workers and may be useful for experimental researchers exploring the physical properties of nanomaterials.","PeriodicalId":12983,"journal":{"name":"High Temperatures-high Pressures","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69443306","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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Author Index: Volume 51, issues 1–6, (2022) 作者索引:第51卷，第1-6期，(2022)

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI: 10.32908/hthp.v52.1411

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