Journal of Supercritical Fluids最新文献_第3页

Study on the dynamic response mechanisms of a lead-bismuth fast reactor coupled with a transcritical CO2 power cycle 跨临界CO2动力循环耦合的铅铋快堆动态响应机制研究

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-06-01 Epub Date: 2026-01-21 DOI: 10.1016/j.supflu.2026.106903

Zhaoyang Yuan , Xuanang Zhang , Jintao He , Yonghao Zhang , Jie Yu , Zhen Wang , Lingfeng Shi , Hua Tian , Gequn Shu

{"title":"Study on the dynamic response mechanisms of a lead-bismuth fast reactor coupled with a transcritical CO2 power cycle","authors":"Zhaoyang Yuan , Xuanang Zhang , Jintao He , Yonghao Zhang , Jie Yu , Zhen Wang , Lingfeng Shi , Hua Tian , Gequn Shu","doi":"10.1016/j.supflu.2026.106903","DOIUrl":"10.1016/j.supflu.2026.106903","url":null,"abstract":"<div><div>The integration of a lead-bismuth fast reactor (LFR) with a transcritical CO<sub>2</sub> (T-CO<sub>2</sub>) power cycle represents a promising offshore nuclear energy solution. Although prior research has advanced the primary and secondary circuits separately, their dynamic interactions under tightly coupled conditions remain insufficiently explored. This work establishes a dynamic system model to investigate bidirectional disturbance propagation and load-following coordination between the two circuits. Results indicate that reducing reactor power by 5 % and 10 % decreases secondary circuit output by 13.8 % and 28.4 %, respectively. Variations in secondary circuit parameters, such as pump speed and cold source temperature, alter the CO<sub>2</sub> mass flow rate and evaporator heat transfer, leading to temperature changes in the primary coolant. Through inherent temperature feedback, the reactor autonomously adjusts its power, demonstrating strong closed-loop coupling. Notably, pump speed has a greater influence on secondary circuit output than cold source temperature, contributing approximately 5.6 % more to the output work variation. During load following, adjusting only reactor power lowers both turbine inlet temperature and system efficiency. In contrast, coordinated adjustment of reactor power and secondary circuit flow maintains a more stable thermal state while adapting to load changes, improving average thermal efficiency by 2.1 % compared to the reactor-only strategy. This study clarifies key thermophysical coupling mechanisms in the LFR–T-CO<sub>2</sub> system and provides a valuable reference for the coordinated control of marine nuclear power systems under dynamic operating conditions.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"232 ","pages":"Article 106903"},"PeriodicalIF":4.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Material selection strategy against high-temperature high-pressure Cl/CO2-containing corrosive environment 高温高压含Cl/ co2腐蚀环境下的材料选择策略

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-06-01 Epub Date: 2026-01-30 DOI: 10.1016/j.supflu.2026.106918

Bihui Wang , Weikai Yi , Xuefei Gao , Xinyu Hu , Kaiyang Li

{"title":"Material selection strategy against high-temperature high-pressure Cl/CO2-containing corrosive environment","authors":"Bihui Wang , Weikai Yi , Xuefei Gao , Xinyu Hu , Kaiyang Li","doi":"10.1016/j.supflu.2026.106918","DOIUrl":"10.1016/j.supflu.2026.106918","url":null,"abstract":"<div><div>This study evaluated the corrosion behavior of seven metallic materials in a CO<sub>2</sub>-saturated aqueous solution (150°C, 30 MPa) with Cl<sup>-</sup> concentrations ranging from 7000 to 100,000 mg/L. Most materials exhibited severe corrosion at Cl<sup>-</sup> concentrations ≥ 50,000 mg/L. Super-13Cr showed significant weight loss, accompanied by surface Cr-rich oxides spallation and substrate dissolution. Cross-sectional analysis revealed a porous double-layer structure (Cr<sub>2</sub>O<sub>3</sub>-rich outer layer and Fe-Cr oxide inner layer) in Super-13Cr. 316 L and duplex stainless steels exhibited pitting corrosion, with 2507 demonstrating superior resistance to pitting. The number of spherical TiO<sub>2</sub> particles on the titanium alloy surface increased with rising Cl<sup>-</sup> concentration. Nickel-based alloys maintained a metallic luster at low Cl<sup>-</sup> concentrations but exhibited differential behavior at high Cl<sup>-</sup> concentrations: Alloy 625 showed severe localized corrosion, while Alloy 718 formed a uniform, light yellow film. Increased Cr and Mo content in the alloy promotes the formation of a thin and stable Cr<sub>2</sub>O<sub>3</sub> layer. However, excessively high Mo content accelerates the Fe dissolution, leading to the formation of Cr-O phases.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"232 ","pages":"Article 106918"},"PeriodicalIF":4.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146089249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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Pressure-rise path and phase control during commissioning of supercritical CO2 pipelines 超临界CO2管道调试过程中的升压路径与相位控制

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-06-01 Epub Date: 2026-02-06 DOI: 10.1016/j.supflu.2026.106925

Xinze Li , Dezhong Wang , Ziyi Hui , Xiaokai Xing

{"title":"Pressure-rise path and phase control during commissioning of supercritical CO2 pipelines","authors":"Xinze Li , Dezhong Wang , Ziyi Hui , Xiaokai Xing","doi":"10.1016/j.supflu.2026.106925","DOIUrl":"10.1016/j.supflu.2026.106925","url":null,"abstract":"<div><div>Compared with traditional pipelines, supercritical CO<sub>2</sub> pipelines exhibit significant multiphase changes during commissioning, with large variations in pressure and temperature. Currently, the coordinated variation patterns during this process lack experimental verification and theoretical support for control methods. Based on a Chinese demonstration project (61 km, DN250, 12 MPa), this study combines numerical simulation and experimental validation to investigate phase‑transition mechanisms and pressure‑rise control. Two pressure‑rise paths are identified: gas phase → supercritical phase (no liquid phase) and gas phase → gas‑liquid coexistence → liquid phase→ dense phase (with liquid phase). In the gas‑liquid stage of the latter, density changes stepwise while pressure remains almost unchanged, consuming considerable time. To save time, reduce CO<sub>2</sub> consumption, and avoid abrupt density changes, the gas phase → supercritical phase path is recommended. High ambient temperature and high initial mass flow rate are key to avoiding the liquid phase. Critical thresholds for the project are: ambient temperature ≥ 9.6 ℃, inlet mass flow ≥ 5.2 kg/s, injection temperature ≥ 32 ℃. The results provide theoretical and engineering guidance for safe and efficient commissioning of supercritical CO<sub>2</sub> pipelines.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"232 ","pages":"Article 106925"},"PeriodicalIF":4.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Numerical study on the influence of equation of state on non-equilibrium condensation of CO2 in the Laval nozzle 状态方程对拉瓦尔喷嘴内CO2非平衡冷凝影响的数值研究

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-06-01 Epub Date: 2026-02-04 DOI: 10.1016/j.supflu.2026.106923

Yuguang Chen, Zhiheng Wang, Guang Xi

{"title":"Numerical study on the influence of equation of state on non-equilibrium condensation of CO2 in the Laval nozzle","authors":"Yuguang Chen, Zhiheng Wang, Guang Xi","doi":"10.1016/j.supflu.2026.106923","DOIUrl":"10.1016/j.supflu.2026.106923","url":null,"abstract":"<div><div>This paper investigates the influence of equation of state (EOS) on the non-equilibrium condensation (NEC) phenomenon of CO<sub>2</sub> in the Laval nozzle. First, the NEC model based on droplet nucleation theory was established. Subsequently, a procedure for generating thermophysical property tables based on the SW EOS was developed, and full-property formulations for cubic EOSs (PR, RK, and SRK) were derived. All EOSs were implemented into the solver via C programming. The results demonstrate that, compared with the built-in EOS of the solver, the proposed property model incorporating full real gas effects exhibits superior predictive performance. The SW EOS is not adopted due to its poor prediction of the condensation onset location. The cubic EOSs yield similar results for subsonic condensation; however, for supersonic condensation occurring in the divergent section of the nozzle, the PR EOS and SRK EOS still predict unsatisfactory condensation onset locations. Therefore, this study ultimately recommends the use of the RK EOS for predicting NEC of CO<sub>2</sub>, as it provides a balanced accuracy in predicting both the condensation onset location and the pressure distribution.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"232 ","pages":"Article 106923"},"PeriodicalIF":4.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

A supercritical carbon dioxide pre-isothermal crystallization foaming strategy for lightweight TPU/PLA composite foam with enhanced compressive strength and elasticity 提高抗压强度和弹性的轻质TPU/PLA复合泡沫的超临界二氧化碳预等温结晶发泡策略

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-06-01 Epub Date: 2026-02-02 DOI: 10.1016/j.supflu.2026.106921

Huazhen Jiang, Panfeng Shao, Guangxian Li, Xia Liao

{"title":"A supercritical carbon dioxide pre-isothermal crystallization foaming strategy for lightweight TPU/PLA composite foam with enhanced compressive strength and elasticity","authors":"Huazhen Jiang, Panfeng Shao, Guangxian Li, Xia Liao","doi":"10.1016/j.supflu.2026.106921","DOIUrl":"10.1016/j.supflu.2026.106921","url":null,"abstract":"<div><div>Thermoplastic polyurethane (TPU) foam has extensively application in vibration damping, sport protective materials and other fields due to excellent elasticity and lightweight properties. The advantages of non-toxicity, low cost and non-combustibility, resulting from the use of supercritical carbon dioxide (scCO<sub>2</sub>) foaming, have emerged as a desirable method for producing TPU foam compared to traditional chemical foaming. However, the TPU foam produced by scCO<sub>2</sub> foaming will shrink severely, which seriously limits the applications of TPU foam. Therefore, a strategy to regulate the matrix strength of TPU by adding a second PLA phase and to control the crystallization behavior through pre-isothermal crystallization was proposed to control the foaming behavior of the TPU/PLA blend in this research. The results showed that the cell structure can be optimized and the final expansion ratio can be improved obviously by pre-isothermal crystallization foaming with the best final expansion ratio of 11.6 times. Moreover, the mechanism of shrink behavior was verified by Kohlrausch-Williams-Watts (KWW) model. In addition, the maximum stress and energy loss ecoefficiency of TPU/PLA foam can also be optimized by pre-isothermal crystallization foaming due to the uniform cell structure and increased crystallinity. This paper provides a new approach to produce a high expansion ratio TPU foam with satisfactory cyclic compressive properties.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"232 ","pages":"Article 106921"},"PeriodicalIF":4.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146109701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Solid solubility measurement and microparticle production by supercritical process: A case study of pirfenidone 超临界工艺固溶度测定及微粒生产：以吡非尼酮为例

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-06-01 Epub Date: 2026-01-20 DOI: 10.1016/j.supflu.2026.106899

Yun Chang , Yung-Chun Yang , Chieh-Ming Hsieh , Chie-Shaan Su

{"title":"Solid solubility measurement and microparticle production by supercritical process: A case study of pirfenidone","authors":"Yun Chang , Yung-Chun Yang , Chieh-Ming Hsieh , Chie-Shaan Su","doi":"10.1016/j.supflu.2026.106899","DOIUrl":"10.1016/j.supflu.2026.106899","url":null,"abstract":"<div><div>Pirfenidone is an orally active antifibrotic agent for the treatment of idiopathic pulmonary fibrosis. For designing effective pulmonary drug delivery, microparticle production with controlled particle size is crucial. To select the appropriate supercritical process to meet the goal of particle design of pirfenidone, the solubility of pirfenidone in supercritical carbon dioxide (CO<sub>2</sub>) was measured at 313 K to 333 K and 10 MPa to 22 MPa, yielding dissolved mole fractions between 3.90 × 10⁻<sup>5</sup> and 1.77 × 10⁻<sup>3</sup>. The measured solubility data were also correlated using four semi-empirical models, with the Chrastil equation providing the best fit. Due to its high solubility, the rapid expansion of supercritical solutions (RESS) was selected for microparticle generation. The effects of extraction temperature, extraction pressure, pre-expansion temperature, and spray distance were investigated. Under the appropriate screening conditions, pirfenidone microparticles with a mean size of 2.5 μm, which fall within the size range suitable for pulmonary drug delivery, were produced. In addition, solid-state characterizations, including PXRD, DSC, and FTIR, confirmed that the crystalline form, thermal behavior, and spectroscopic properties of pirfenidone remained consistent before and after RESS processing. These results demonstrate the feasibility of the RESS process for producing inhalable pirfenidone microparticles and provide fundamental solubility data for supercritical CO<sub>2</sub> processing.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"232 ","pages":"Article 106899"},"PeriodicalIF":4.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Investigation of volatile organic compounds adsorption capacities and regeneration properties of silica aerogel particles 二氧化硅气凝胶颗粒对挥发性有机物的吸附性能及再生性能研究

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-06-01 Epub Date: 2026-01-20 DOI: 10.1016/j.supflu.2026.106905

Işık Sena Akgün , Ayça Tüter Semercioğlu , Emine Yapıcı , Berat Keçeci , Derin Aktaş , Gökhan Sır , Sevil Yücel

{"title":"Investigation of volatile organic compounds adsorption capacities and regeneration properties of silica aerogel particles","authors":"Işık Sena Akgün , Ayça Tüter Semercioğlu , Emine Yapıcı , Berat Keçeci , Derin Aktaş , Gökhan Sır , Sevil Yücel","doi":"10.1016/j.supflu.2026.106905","DOIUrl":"10.1016/j.supflu.2026.106905","url":null,"abstract":"<div><div>This study investigates the volatile organic compound adsorption and thermal regeneration properties of four different silica aerogels which were synthesized via supercritical carbon dioxide drying and spray drying using methyl ethyl ketone as a model indoor air pollutant. The goal was to assess the impact of structural properties (surface area, pore size, drying technique) and magnesium doping on both initial adsorption capacity and long-term reusability over 15 adsorption/desorption cycles. The silica aerogel dried with supercritical carbon dioxide, characterized by high BET surface area (976.7 ± 0.4 m<sup>2</sup>/g) and average pore size (11.7 ± 0.1 nm), exhibited the superior initial methyl ethyl ketone adsorption capacity compared to the spray-dried aerogels and commercial activated carbon. While magnesium doping did not significantly improve the initial uptake, it was associated with a more stable desorption performance. Regeneration temperature was found to be the dominant factor for performance retention. Increasing the regeneration temperature from 55°C to 130°C significantly mitigated capacity decline by enhancing methyl ethyl ketone desorption efficiency. Kinetic analysis revealed that methyl ethyl ketone adsorption on both the silica aerogel dried with supercritical carbon dioxide and commercial activated carbon was best described by the Pseudo-Second-Order model, suggesting a primary rate-limiting step involving surface adsorption. Overall, the silica aerogel dried with supercritical carbon dioxide sample demonstrated an initial adsorption capacity approximately 1.5 times higher than commercial activated carbon, proving that supercritically dried silica aerogels are highly promising, durable, and regenerable adsorbents for effective indoor volatile organic compound removal.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"232 ","pages":"Article 106905"},"PeriodicalIF":4.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Critical process thresholds in foam injection molding revealed by real-time visualization 泡沫注射成型关键工艺阈值的实时可视化研究

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-06-01 Epub Date: 2026-01-16 DOI: 10.1016/j.supflu.2026.106897

Ai Lin Hong , Chun Yang Chiu , Cheng Yi Kao , Chen-Yu Fang , Kiday Fiseha Gebremedhin , Shu Kai Yeh , Sen Yeu Yang , Chul B. Park

{"title":"Critical process thresholds in foam injection molding revealed by real-time visualization","authors":"Ai Lin Hong , Chun Yang Chiu , Cheng Yi Kao , Chen-Yu Fang , Kiday Fiseha Gebremedhin , Shu Kai Yeh , Sen Yeu Yang , Chul B. Park","doi":"10.1016/j.supflu.2026.106897","DOIUrl":"10.1016/j.supflu.2026.106897","url":null,"abstract":"<div><div>Foam injection molding (FIM) has remained largely empirical due to the opacity of molds preventing direct observation of foaming dynamics. This study establishes a visualization platform for systematic investigation of FIM processes, enabling future research across diverse polymer systems. Building upon established methodologies, this work successfully reproduces and validates previous findings while extending investigations to unexplored parameter regimes. A custom-designed mold with integrated optics and pressure sensors enabled simultaneous visual and pressure monitoring of polystyrene foaming with CO<sub>2</sub>. Systematic experiments investigated both low-pressure (LPFIM) and high-pressure (HPFIM) FIM with core-back technology, demonstrating the platform’s capability to capture fundamental process-structure relationships across different processing modes. In LPFIM, an insufficient mold venting design can affect mold filling, with better mold filling achieved at lower injection speeds (50 cm<sup>3</sup>/s) compared to higher speeds (80 cm<sup>3</sup>/s). This finding contrasts with previous studies using optimized venting systems, underscoring the crucial role of mold design in achieving LPFIM success. In HPFIM with core-back, a critical transition was observed at 0.8 mm core-back distance, triggering cell density increases from < 60 cells/cm<sup>3</sup> to > 4500 cells/cm<sup>3</sup>. An optimal core-back velocity of 33 mm/s was identified, with higher velocities causing pressure rebound and rapid gas consumption that suppress further nucleation. These fundamental insights provide qualitative guidelines for process optimization while establishing a robust research platform for future investigations across different polymer-blowing agent systems.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"232 ","pages":"Article 106897"},"PeriodicalIF":4.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Numerical assessment of scale-up criteria in a wall-cooled reactor for hydrogen combustion in supercritical water 超临界水中氢燃烧壁冷堆放大准则的数值评定

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-06-01 Epub Date: 2026-02-02 DOI: 10.1016/j.supflu.2026.106919

Mingjing Fan, Xiaoge Zhang, Yu Zhang, Haoze Wang, Hao Wang, Youjun Lu

{"title":"Numerical assessment of scale-up criteria in a wall-cooled reactor for hydrogen combustion in supercritical water","authors":"Mingjing Fan, Xiaoge Zhang, Yu Zhang, Haoze Wang, Hao Wang, Youjun Lu","doi":"10.1016/j.supflu.2026.106919","DOIUrl":"10.1016/j.supflu.2026.106919","url":null,"abstract":"<div><div>A laboratory-scale wall-cooled reactor for hydrogen hydrothermal combustion was scaled up by factors of 10 and 100 using four scale-up criteria: constant velocity (CV), constant residence time (CRT), constant volume to jet momentum ratio (CM), and constant volume to jet kinetic energy ratio (CK). Computational fluid dynamics (CFD) simulations were then conducted to evaluate the performance of the scaled reactors. The results show that the overall flow field is predominantly controlled by the momentum ratio of the multiple jets, rather than the nozzle’s internal flow regime, specifically the Reynolds number. Reactor scale-up weakens radial jet diffusion, slightly reducing local fuel–oxidizer mixing and suppressing the radial transport of high-temperature combustion products. The global residence time follows the order CV > CK > CM > CRT, consistent with reactor volume changes induced by scale-up. The peak temperature along the centerline exhibits a slight decrease and shifts downstream with increasing reactor size, due to reduced entrainment and weakened radial momentum exchange. Wall temperatures decrease under the CV criterion but increase under CRT, CM, and CK, reflecting the combined effects of heat transfer area per unit heat load and local fuel–oxidizer mixing intensity. Species concentrations in the reactor core remain nearly constant, with scale-up effects only marginally observed in the cooling water layer near the wall. The CV criterion is recommended for scaling up hydrothermal combustion, as it reduces peak and wall temperatures, thereby lowering material performance requirements for large-scale reactors.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"232 ","pages":"Article 106919"},"PeriodicalIF":4.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146109703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Estimation of critical curves by empirical and rigorous modelling methods: Case studies on n-alkane + dimethyl carbonate and n-alkane + chloroalkane 用经验和严格的建模方法估计临界曲线：以正烷烃+碳酸二甲酯和正烷烃+氯烷烃为例

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-06-01 Epub Date: 2026-01-18 DOI: 10.1016/j.supflu.2026.106900

Luis A. Roman , Gary A. Leeke

{"title":"Estimation of critical curves by empirical and rigorous modelling methods: Case studies on n-alkane + dimethyl carbonate and n-alkane + chloroalkane","authors":"Luis A. Roman , Gary A. Leeke","doi":"10.1016/j.supflu.2026.106900","DOIUrl":"10.1016/j.supflu.2026.106900","url":null,"abstract":"<div><div>The determination of critical curves is important for the design of chemical processes. The accuracy of fast and rigorous methods for estimating the vapour-liquid critical curves of n-alkane + dimethyl carbonate, and n-alkane + chloroalkane binary systems is tested. The n-alkanes range from propane to n-decane, whereas the chloroalkanes are dichloromethane, 1,1-dichloroethane and 1,2-dichloroethane. The fast estimation methods evaluated are: the conformal solution theory (CM); the method of He et al. (2017); and the method of Tang et al. (2024). The rigorous methods studied are: the corresponding states principle (CSP) with the one-fluid van der Waals equation of state (vdW EoS); and the Heidemann-Khalil-Michelsen (HKM) method with the Peng-Robinson EoS. Despite the simplicity of the EoS, CSP provides the best correlations, resulting in overall average absolute relative errors (<span><math><mi>AARE</mi></math></span>) for temperature and pressure of <span><math><mrow><mi>AARE</mi><msup><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msup><mo>=</mo><mn>0.36</mn><mo>%</mo></mrow></math></span> and <span><math><mrow><mi>AARE</mi><msup><mrow><mi>p</mi></mrow><mrow><mi>c</mi></mrow></msup><mo>=</mo><mn>1.68</mn><mo>%</mo></mrow></math></span>, respectively. CM is the only recommended fast method due to its scientific soundness and accuracy (<span><math><mrow><mi>AARE</mi><msup><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msup><mo>=</mo><mn>0.55</mn><mo>%</mo></mrow></math></span> <span><math><mrow><mi>and</mi><mi>AARE</mi><msup><mrow><mi>p</mi></mrow><mrow><mi>c</mi></mrow></msup><mo>=</mo><mn>5.10</mn><mo>%</mo></mrow></math></span>). The methods of He and Tang exhibit parameter degeneracy, questioning their reliability. This work underscores the importance to reconsider CSP as a reliable method for estimating critical curves and presents, for the first time, the explicit equations required to apply this method using the VdW EoS.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"232 ","pages":"Article 106900"},"PeriodicalIF":4.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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