International Journal of Thermophysics最新文献

Equation of State for the Thermodynamic Properties of Trans-1,2-dichloroethene [R-1130(E)]

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2025-03-28 DOI: 10.1007/s10765-025-03535-3

Marcia L. Huber, Andrei F. Kazakov, Eric W. Lemmon

{"title":"Equation of State for the Thermodynamic Properties of Trans-1,2-dichloroethene [R-1130(E)]","authors":"Marcia L. Huber, Andrei F. Kazakov, Eric W. Lemmon","doi":"10.1007/s10765-025-03535-3","DOIUrl":"10.1007/s10765-025-03535-3","url":null,"abstract":"<div><p>We present an empirical equation of state in terms of the Helmholtz energy for <i>trans</i>-1,2-dichloroethene [R-1130(E)]. The range of validity is from the triple-point temperature, 223.31 K to 525 K with pressures up to 30 MPa. It may be used to calculate all thermodynamic properties in the fluid phase, including liquid, gas, and supercritical regions. Comparisons are given with existing literature data and estimated uncertainties are provided. In addition, checks were made for correct extrapolation behavior so that the equation behaves in a physically realistic manner when used outside of its range of validity, enabling its use in mixture models. The estimated uncertainties (at a <i>k</i> = 2 or 95 % level of confidence) are based on comparisons with critically assessed data and are 0.25 % for vapor pressure for temperatures in the range 300 K < <i>T</i> < 454 K, rising to 1.5 % as the temperature decreases from 300 K to 265 K. For density in the liquid phase the estimated uncertainty is 0.14 % for temperatures 270 K < <i>T</i> < 410 K and for pressures up to 30 MPa. For the vapor phase the estimated uncertainty in density is 3 %. The uncertainty for liquid-phase heat capacity is 1 % at atmospheric pressure over the temperature range 268 K < <i>T</i> < 309 K, and the uncertainty for the speed of sound in the liquid phase is 0.25 % for temperatures 230 K < <i>T</i> < 420 K and for pressures up to 30 MPa. The uncertainties are larger outside of these specified ranges and in the critical region.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10765-025-03535-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716816","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}

引用次数: 0

Effect of Surface Treatment on the Thermal Properties of Magnesium–Rare Earth Alloys

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2025-03-28 DOI: 10.1007/s10765-025-03545-1

Yu-Peng Hu, Xu Zhou, Gen Zhu, Yi-Jun Wang, Jun-Hong Chen, Ren-Wei Ge, Sheng-Lai Chen, Gang Zhang, Ming-Hai Li

{"title":"Effect of Surface Treatment on the Thermal Properties of Magnesium–Rare Earth Alloys","authors":"Yu-Peng Hu, Xu Zhou, Gen Zhu, Yi-Jun Wang, Jun-Hong Chen, Ren-Wei Ge, Sheng-Lai Chen, Gang Zhang, Ming-Hai Li","doi":"10.1007/s10765-025-03545-1","DOIUrl":"10.1007/s10765-025-03545-1","url":null,"abstract":"<div><p>To enhance the mechanical properties, ignition resistance, corrosion resistance, and oxidation resistance of magnesium, elements such as lithium, manganese, zinc, and rare earth elements are added into magnesium, and the surface treatments are also applied. The addition of elements and surface treatments will affect the thermal properties of magnesium alloys. However, less attention has been paid on this field, which limits the accurate prediction of temperature and thermal stress distribution in engineering applications. In this study, for the comparison between magnesium–rare earth alloys treated with micro-arc oxidation and chemical oxidation, the thermal conductivity, specific heat capacity, and thermal expansion coefficient were measured from room temperature to 500 °C, respectively. Additionally, the phase transition temperature, ignition temperature, and combustion heat were also determined. The variations of various thermal properties with temperature were obtained, and the results showed that the maximum deviations in thermal conductivity, phase transition temperature, specific heat capacity, and thermal expansion coefficient between the magnesium–rare earth alloys treated with micro-arc oxidation and chemical oxidation were 9 %, 0.04 %, 16.21 %, and 2.53 %, respectively. Both the micro-arc oxidation and chemical oxidation surface treatment could improve the ignition temperature of the magnesium–rare earth alloys at least 49 °C. The results of this study demonstrate that surface treatments effectively enhance the ignition resistance of magnesium alloys, but the effect on other thermal properties varies. In addition, accurate thermal property measurements play a crucial role in optimizing the thermal design of components made from magnesium alloys.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716821","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

Analyzing Intermolecular Interactions in 5-Methyl Furfural and 1-Alkanol (C4-C7) Mixtures: Thermodynamic and Transport Investigations

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2025-03-25 DOI: 10.1007/s10765-025-03544-2

Mohammad Almasi, Ariel Hernández

引用次数: 0

Compressed Liquid (({{p}})-({{rho}})-({{T}})) Measurements of trans-1,2-Dichloroethene [R-1130(E)]

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2025-03-24 DOI: 10.1007/s10765-025-03526-4

Tara J. Fortin, Stephanie L. Outcalt

引用次数: 0

A Ti/Pt Hot Wire Anemometer and its SiO₂ Enhanced Structural Implementation for Mechanical Ventilators

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2025-03-20 DOI: 10.1007/s10765-025-03540-6

I. R. Chávez-Urbiola, G. León-Muñoz, J. J. Alcantar-Peña, J. Ponce-Hernández, N. A. Rodríguez-Olivares, F. Jimenez-Oronia, R. Sánchez-Fraga

{"title":"A Ti/Pt Hot Wire Anemometer and its SiO₂ Enhanced Structural Implementation for Mechanical Ventilators","authors":"I. R. Chávez-Urbiola, G. León-Muñoz, J. J. Alcantar-Peña, J. Ponce-Hernández, N. A. Rodríguez-Olivares, F. Jimenez-Oronia, R. Sánchez-Fraga","doi":"10.1007/s10765-025-03540-6","DOIUrl":"10.1007/s10765-025-03540-6","url":null,"abstract":"<div><p>This study presents the development and implementation of a microfabricated hot-wire anemometer designed for mechanical ventilators. The sensor is fabricated using MEMS techniques, incorporating a SiO₂ bridge that enhances structural integrity while enabling precise airflow measurement up to 326 lpm (63.3 m⋅s<sup>−1</sup>). The design leverages the principles of thermal anemometry, utilizing a platinum heating element with optimized mechanical support to ensure high sensitivity and durability. Performance evaluations confirm the sensor’s compliance with ISO 80601–2-12 standards for mechanical ventilators, demonstrating high stability, minimal hysteresis, and fast response times. Additionally, endurance testing validates the sensor's robustness under extreme conditions. These results highlight the potential of this hot-wire anemometer for clinical applications, providing an alternative to conventional airflow sensors with improved structural resilience and measurement accuracy.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143655390","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

Assessment of the Thermal Performance of Non-residential Building Envelope Prototype Specimens Insulated with Porous Cementitious Nanocomposites Containing Phase Change Materials, Using a Hot Box Apparatus

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2025-03-20 DOI: 10.1007/s10765-025-03537-1

Benjamin A. Tourn, Christina Strunz, Juan C. Álvarez Hostos, Cornelia Stark, Barbara Klemczak

{"title":"Assessment of the Thermal Performance of Non-residential Building Envelope Prototype Specimens Insulated with Porous Cementitious Nanocomposites Containing Phase Change Materials, Using a Hot Box Apparatus","authors":"Benjamin A. Tourn, Christina Strunz, Juan C. Álvarez Hostos, Cornelia Stark, Barbara Klemczak","doi":"10.1007/s10765-025-03537-1","DOIUrl":"10.1007/s10765-025-03537-1","url":null,"abstract":"<div><p>The NRG-STORAGE project aimed to develop innovative, energy-efficient cementitious foams (NRG-Foams) as a sustainable alternative to conventional insulation materials for non-residential building envelopes. NRG-Foams were designed to balance thermal insulation and heat storage capacity while maintaining volume stability and mechanical integrity. The base material consists of a highly conductive cement paste with air bubbles that provide insulating properties. Enhanced heat storage performance is achieved by incorporating microencapsulated phase change materials (MPCM). This study evaluates the thermal performance of wall prototypes constructed from masonry bricks or concrete, insulated with NRG-Foam panels containing MPCM volume fractions ranging from 0% to 20%. Key thermal indicators—including thermal transmittance, decrement factor, time lag, periodic thermal transmittance, energy savings, and dynamic thermal resistance—were assessed using a NETZSCH HotBox Test Chamber TDW 4040 under both steady-state and dynamic conditions. While thermal performance improved progressively with increasing MPCM content, reaching a maximum at 20% MPCM, it did not surpass the performance of specimens with standard insulation materials. Nevertheless, the findings highlight significant potential for further optimization, particularly with higher MPCM volume fractions. Such enhancements could enable NRG-Foams to outperform conventional insulation materials, especially in long-term thermal analyses conducted under more realistic conditions. In addition, the influence of issues encountered during the experimental procedure on the thermal performance assessment of NRG-Foams is also discussed.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143655396","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

Density and Thermal Expansion of Mg–Li Alloys with Lithium Content Up to 30 at%

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2025-03-20 DOI: 10.1007/s10765-025-03543-3

Rasul N. Abdullaev, Yurii M. Kozlovskii, Alibek Sh. Agazhanov, Rashid A. Khairulin, Dmitrii A. Samoshkin, Sergei V. Stankus

{"title":"Density and Thermal Expansion of Mg–Li Alloys with Lithium Content Up to 30 at%","authors":"Rasul N. Abdullaev, Yurii M. Kozlovskii, Alibek Sh. Agazhanov, Rashid A. Khairulin, Dmitrii A. Samoshkin, Sergei V. Stankus","doi":"10.1007/s10765-025-03543-3","DOIUrl":"10.1007/s10765-025-03543-3","url":null,"abstract":"<div><p>An experimental study of the relative elongation and the thermal expansion of a number of the magnesium–lithium alloys containing 5, 10, 17, 21, 25, and 30 at% lithium in a wide temperature range from 100 K to 650 K was carried out using the dilatometric method. The density of the alloys at room temperature was measured using the Archimedes method. The temperature and composition dependences of the studied properties were constructed using the obtained results. A comparison with literature results and an analysis of the behavior of the density and the linear thermal expansion coefficient (LTEC) of the Mg–Li alloys with an increase in lithium content to 30 at% (11 wt%) were carried out. It was shown that the addition of lithium up to 17 at% has virtually no effect on the LTEC value. Whereas in the range of 17 at% to 30 at% Li, the change in the LTEC value of the alloys reaches up to about 40%. It was found that in the Mg–Li alloys with a lithium content of 21 at% to 30 at% a phase transition occurs in the range of 226 K to 248 K, where the linear thermal expansion coefficient change abruptly. Moreover, the magnitude of the LTEC jump increases with lithium content. This kind of transition was found earlier in the study of the Mg–Li eutectic alloy and is presumably related to the martensitic-type transformation of the lithium-rich bcc magnesium–lithium alloys to the hcp structure.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143655393","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 of Solid Carbon Dioxide

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2025-03-20 DOI: 10.1007/s10765-025-03541-5

Md Saiduzzaman, Viacheslav A. Konstantinov, Ove Andersson

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Investigating Design Considerations and Offsets in Body Infrared Thermometer Accuracy

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2025-03-20 DOI: 10.1007/s10765-025-03539-z

Efrem Kebede Ejigu

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Heat Transfer Performance Study of Magnetic Fe2O3/Graphene Nanofluid in DASC

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2025-03-20 DOI: 10.1007/s10765-025-03542-4

Mengmeng Ma, Shan Qing, Xiaohui Zhang, Mingci Hu, Zhihui Jia

{"title":"Heat Transfer Performance Study of Magnetic Fe2O3/Graphene Nanofluid in DASC","authors":"Mengmeng Ma, Shan Qing, Xiaohui Zhang, Mingci Hu, Zhihui Jia","doi":"10.1007/s10765-025-03542-4","DOIUrl":"10.1007/s10765-025-03542-4","url":null,"abstract":"<div><p>Magnetic nanofluids have come to attention due to their special physical properties, but their poor thermophysical properties limit their generalized use in DASC. In this study, Fe<sub>2</sub>O<sub>3</sub>/graphene nanoparticles were obtained by attaching magnetic Fe<sub>2</sub>O<sub>3</sub> to graphene sheets with excellent thermophysical properties, which enhanced the thermophysical properties of magnetic nanofluids. The study first analyzed the effects of different reaction conditions on the structural composition of the nanoparticles as well as the thermophysical properties of the nanofluids, and then applied the Fe<sub>2</sub>O<sub>3</sub>/graphene nanofluids in a DASC simulator to analyze the photothermal conversion performance of the nanofluids. The results show that the saturation magnetization strength of the G3 sample reaches 47.47 emu·g<sup>−1</sup>, and the thermal conductivity of the nanofluid after its preparation into a nanofluid reaches 0.642 W·m<sup>−1</sup>·K at 80 °C, whereas the thermal conductivity of the base fluid is only 0.41 W·m<sup>−1</sup>·K. For the photothermal conversion performance, with the increase of the proportion of Fe<sub>2</sub>O<sub>3</sub>, the photothermal conversion efficiency shows a trend of increasing and then decreasing, and the highest value of its photothermal conversion efficiency appears in the G2 sample at 200 ppm, reaching 58.21 %, which is 31.9 % higher than that of the base fluid.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143655395","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