High Temperatures-high Pressures最新文献_第6页

A method for simultaneous measurements of compressional wave and shear wave velocities in rocks and minerals at high pressure and high temperature: A modification to the combined transmission-reflection method 在高压和高温下同时测量岩石和矿物中纵波和横波速度的方法:对透射-反射联合法的改进

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2022-01-01 DOI: 10.32908/hthp.v51.1249

Wei Song, Qizhe Tang, Chang Su, Xiang Chen, Yonggang Liu

{"title":"A method for simultaneous measurements of compressional wave and shear wave velocities in rocks and minerals at high pressure and high temperature: A modification to the combined transmission-reflection method","authors":"Wei Song, Qizhe Tang, Chang Su, Xiang Chen, Yonggang Liu","doi":"10.32908/hthp.v51.1249","DOIUrl":"https://doi.org/10.32908/hthp.v51.1249","url":null,"abstract":"We present a modification to the combined transmission-reflection method, which is frequently used to measure the elastic wave velocities in rocks and minerals at high pressure and high temperature in multi-anvil apparatus. The modification mainly focuses on the adoption of dual-mode ultrasonic transducer and new backing reflector (a molybdenum foil), the former was used to simultaneously measure the travel times of compressional wave and shear wave in the sample, and the latter was used to intensify the reflection signals of the buffer rod. The correction time of the molybdenum foils was determined using the equation of state and highpressure velocities of molybdenum. In addition, the length change of sample under high pressure was also taken into account. Using this method, we simultaneously measured the compressional wave and shear wave velocities in Z-cut a-quartz single crystal to 2 GPa at room temperature, and natural mafic granulite sample to 1.4 GPa and 500�C in a multianvil apparatus. The results of this work agree well with those of previous measurements and demonstrate the feasibility of this new method. We believe that by using this method, more accurate elastic properties of rocks and minerals under high pressure and high temperature can be obtained, especially Poisson�s ratio.","PeriodicalId":12983,"journal":{"name":"High Temperatures-high Pressures","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69443476","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

Thermal conductivity measurement of VO2 nanofluid using bidirectional 3ω method 用双向3ω法测量VO2纳米流体的导热系数

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2021-01-01 DOI: 10.32908/hthp.v50.1071

Duk Hyung Lee, D. Oh, Sok-Won Kim, Yeon Suk Choi

引用次数: 0

Thermal and mechanical behavior of graphene loaded synthetic graphite/polyphenylene sulfide (PPS) composites 石墨烯负载合成石墨/聚苯硫醚(PPS)复合材料的热力学性能

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2021-01-01 DOI: 10.32908/hthp.v50.1089

L. Altay, G. S. Tantug, H. Cekin, Y. Seki, M. Sarıkanat

{"title":"Thermal and mechanical behavior of graphene loaded synthetic graphite/polyphenylene sulfide (PPS) composites","authors":"L. Altay, G. S. Tantug, H. Cekin, Y. Seki, M. Sarıkanat","doi":"10.32908/hthp.v50.1089","DOIUrl":"https://doi.org/10.32908/hthp.v50.1089","url":null,"abstract":"Thermoplastics when they become thermally conductive, have a great potential to be used in thermal management applications due to their low cost, lightweight, and flexibility. Here, synthetic graphite and graphene are used as thermally conductive fillers to fabricate Polyphenylene Sulfide- (PPS) based composite materials with high thermal conductivity. Graphene and graphite added PPS composites were manufactured by using a twinscrew extruder and injection molding machine. Physical, thermal, mechanical, and morphological properties of the composites were investigated by several characterization methods including thermogravimetric analysis, differential scanning calorimetry, thermomechanical analysis, scanning electron microscopy, thermal diffusivity measurement, and tensile and flexural tests, The in-plane and through-plane thermal conductivity coefficient of graphene (5 wt. %) loaded synthetic graphite (40 wt. %)/PPS composites are greatly improved to 26.45 and 5.02 W/mK, respectively compared to that of neat PPS. The outstanding in-plane thermal conductivity of graphene loaded graphite/PPS composites is attributed to the formation of an effective thermal conductive pathway due to the alignment of the layered structure of graphene and graphite fillers in the flow direction.","PeriodicalId":12983,"journal":{"name":"High Temperatures-high Pressures","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69442312","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

Measurement of thermo-optic coefficient of vanadium dioxide nanofluids using an interferometer 用干涉仪测量二氧化钒纳米流体的热光学系数

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2021-01-01 DOI: 10.32908/hthp.v50.1045

Hyunki Kim, Taesung Kim, Sok-Won Kim

{"title":"Measurement of thermo-optic coefficient of vanadium dioxide nanofluids using an interferometer","authors":"Hyunki Kim, Taesung Kim, Sok-Won Kim","doi":"10.32908/hthp.v50.1045","DOIUrl":"https://doi.org/10.32908/hthp.v50.1045","url":null,"abstract":"The change in refractive index with respect to temperature (dn/dT) is defined as the thermo-optic coefficient. It varies according to the light wavelength and temperature, so it is a very important physical quantity that influences light propagation. In this study, we observed the metal-insulator transition (MIT) effect of VO2 on the optical properties of VO2 nanofluid and the thermo-optic coefficient of pure ethylene glycol (EG). We prepared two concentrations (1 × 10–3 mol% and 1 × 10–2 mol%) of EG + VO2 nanofluids by dispersing 50-nm VO2 nano-spheres and injecting them into a cubic glass cell (1 × 1 × 4 cm3). The thermo-optic coefficient was measured by counting the number of interference fringe movements with a Michelson interferometer. The thermo-optic coefficient obtained for pure EG agreed with the literature value within 13.3%. Below 60˚C, the thermo-optic coefficients of EG + VO2 were smaller than that of pure EG, but they increased rapidly as the temperature increased. Above 60˚C, the thermo-optic coefficients of both EG + VO2 nanofluids rapidly changed and showed a peak and valley near 62˚C and 67˚C, respectively. We used the maximum value of the derivative of the thermo-optic coefficient (d2n/dT2) to obtain the phase transition temperatures of the VO2 nanofluids, which were 64.6˚C and 65.0˚C in the samples with 1 × 10–3 mol% and 1 × 10–2 mol%, respectively.","PeriodicalId":12983,"journal":{"name":"High Temperatures-high Pressures","volume":"54 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69442486","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

Thermal performance of solar collector based on volumetric absorption harvesting method using Fe3O4 nanofluid 基于Fe3O4纳米流体体积吸收集热器热性能研究

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2021-01-01 DOI: 10.32908/hthp.v50.1061

J. Ham, Yunchan Shin, Honghyun Cho

{"title":"Thermal performance of solar collector based on volumetric absorption harvesting method using Fe3O4 nanofluid","authors":"J. Ham, Yunchan Shin, Honghyun Cho","doi":"10.32908/hthp.v50.1061","DOIUrl":"https://doi.org/10.32908/hthp.v50.1061","url":null,"abstract":"In this study, the characteristics of volumetric absorption for solar harvesting using a Fe3O4@polyacrylic acid (PAA) nanofluid (NF) are investigated experimentally. The concentration of the Fe3O4@PAA NF was varied from 0 to 0.2wt%, and its mass flow rate was set to 0.0025 and 0.005 kg/s. As a result, the average efficiency of the solar collector at the Fe3O4@PAA NF of 0.05wt% was the highest at the mass flow rates of 0.0025 kg/s and 0.005 kg/s and the improvement ratio of average efficiency was 1.15 and 1.19, respectively, compared to water. The collector performance of the solar thermal harvesting improved owing to the improvement in the solar absorption and heat transfer, as well as the uniform temperature at the receiver tube as the concentration of the Fe3O4@PAA NF increased to a concentration of 0.05wt%. However, the collector performance of the solar thermal harvesting decreased for the 0.05wt% Fe3O4@PAA NF because of the increase in heat loss by the non-uniform temperature at the receiver tube and heat transfer. The increase in mass flow rate can reduce the heat loss by the decrease in temperature in the receiver tube; consequently, the efficiency of the solar collector using NFs is improved.","PeriodicalId":12983,"journal":{"name":"High Temperatures-high Pressures","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69442493","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

In Memoriam Professor Ismail Hakki Tavman 纪念伊斯梅尔·哈基·塔夫曼教授

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2021-01-01 DOI: 10.32908/hthp.v50.1201

引用次数: 0

Development of a new method to measure surface tension of molten oxides 建立了一种测量熔融氧化物表面张力的新方法

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2021-01-01 DOI: 10.32908/hthp.v50.857

Toshiki Kondo, H. Muta, Y. Ohishi

引用次数: 3

The elastic and thermodynamic properties of TbAl and DyAl under high pressure TbAl和DyAl在高压下的弹性和热力学性质

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2021-01-01 DOI: 10.32908/hthp.v50.903

Lili Liu, Cai Chen, Liwan Chen, Y. Wen

引用次数: 1

Analysis of thickness and interfacial thermal resistance of Au microheater on glass or polyimide substrate 玻璃或聚酰亚胺基板上金微加热器厚度及界面热阻分析

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2021-01-01 DOI: 10.32908/hthp.v50.1073

H. Kim, Woong Ko, D. Oh

引用次数: 2

High-temperature cyclic fatigue in air of SiCf/SiC ceramic matrix composite with a pyrolytic carbon interface 具有热解碳界面的SiCf/SiC陶瓷基复合材料在空气中的高温循环疲劳

IF 1.1 4区工程技术

High Temperatures-high Pressures Pub Date : 2021-01-01 DOI: 10.32908/HTHP.V50.1079

K. Kim, Kyoon Choi, Yoonsoo Han, S. Nahm, Sung-Min Lee

引用次数: 1