Journal of Supercritical Fluids最新文献

{"title":"Dynamic evolution of corrosion products and their influence on carbon steel corrosion in supercritical CO₂","authors":"Chenhao Huang ,&nbsp;Weizhi Zhang ,&nbsp;Jing yan ,&nbsp;Tan Gu ,&nbsp;Hongyuan Fan ,&nbsp;Lan Sun ,&nbsp;Jun Wang","doi":"10.1016/j.supflu.2025.106670","DOIUrl":"10.1016/j.supflu.2025.106670","url":null,"abstract":"<div><div>The successful implementation of carbon capture and storage depends on mitigating CO₂-induced pipeline corrosion. This study simulates supercritical CO₂ corrosion of carbon steel under extreme saturated water conditions, comparing corrosion mechanisms in atmospheric, low, and supercritical CO₂ environments using weight loss and electrochemical methods. The results show that the corrosion rate in the supercritical environment is 0.396 ± 0.017 mm/y, which is much higher than that in the atmospheric environment (0.226 ± 0.011 mm/y) and slightly higher than that in the low pressure environment (0.317 ± 0.013 mm/y). However, the electrochemical impedance data show that the resistance of the corrosion product layer formed in the supercritical environment in the later stage of corrosion to electric charge is 2439.53 Ω·cm², which is 5 times that in the low pressure environment and 31 times that in the atmospheric pressure environment. This shows that the supercritical corrosion product layer structure is denser and has a stronger protective effect on the carbon steel in the later stage of corrosion. The corrosion resistance in the supercritical CO₂ is controlled by the deposition of corrosion products, forming a double-layer structure. In-situ electrochemical data show that the resistance of the corrosion layer after corrosion for 192 h is 91 times that of corrosion for 6 h (26.66 Ω·cm²). Combined with TEM and other experiments, it is found that this is mainly due to the change of relative supersaturation driving the formation of amorphous and crystalline layers, which affects the overall corrosion protection of the material.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106670"},"PeriodicalIF":3.4,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184527","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}

{"title":"A wall-temperature-independent heat transfer model and dominant dimensionless numbers for supercritical CO2 in vertical upward flow","authors":"Zhenghui Hou,&nbsp;Haifan Liao,&nbsp;Kuang Yang,&nbsp;Shaozhe Bai,&nbsp;Xinjiang Fan,&nbsp;Chaofan Yang,&nbsp;Haijun Wang","doi":"10.1016/j.supflu.2025.106665","DOIUrl":"10.1016/j.supflu.2025.106665","url":null,"abstract":"<div><div>The heat transfer coefficient is a critical parameter for the design and optimization of supercritical carbon dioxide (sCO₂) heat exchange systems. Based on 20723 data points collected from 22 published studies, existing heat transfer correlations are evaluated, and a new model with improved stability and predictive accuracy is developed. Current correlations for upward vertical sCO₂ flow typically include wall-temperature-dependent parameters, which often lead to issues such as non-uniqueness or the absence of solutions during wall temperature prediction, along with limited accuracy. To address these issues, this study integrates the Buckingham Pi theorem and constructs a wall-temperature-independent heat transfer model using a dimensionless neural network. This approach avoids the problems of multiple or no solutions and achieves high predictive performance, with mean absolute relative errors of 2.83 % for wall temperature and 5.81 % for Nusselt number predictions. Furthermore, the active subspace method is employed to identify four dominant dimensionless groups governing the heat transfer process. These groups can be decomposed into products of commonly known dimensionless numbers. During this process, a new dimensionless number—the buoyancy generation (<em>BG</em>) number—is proposed and defined. This study leverages data-driven dimensional analysis to explore key influencing parameters and dominant dimensionless numbers for supercritical heat transfer, offering new insights into the underlying physical mechanisms.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106665"},"PeriodicalIF":3.4,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154387","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}

{"title":"Measurement of key critical parameters for binary mixture of carbon dioxide (CO2) + dimethyl ether (DME) and modification of the CO2 + hydrocarbon (HC) prediction model","authors":"Gequn Shu ,&nbsp;Shanzhu Hu ,&nbsp;Xueyan Wang ,&nbsp;Yu Chen ,&nbsp;Hua Tian","doi":"10.1016/j.supflu.2025.106668","DOIUrl":"10.1016/j.supflu.2025.106668","url":null,"abstract":"<div><div>The critical parameters of carbon dioxide (CO₂) + dimethyl ether binary mixture, including critical temperature and pressure, have been determined by variable-volume view-cell method in this study. The critical point is determined by observing the disappearance and reappearance of the vapor-liquid meniscus at the center of the sapphire viewport. The extended uncertainties of mixture composition, critical temperature, and critical pressure are less than 0.00023, 0.5 K, 0.03 MPa (<em>k</em> = 2, 0.95 confidence level), respectively. The experimental results are compared with predictions from the Peng-Robinson equation of state, the Modified Extended Chueh–Prausnitz (MECP) method, the Helmholtz energy equation of state, as well as with relevant data available in the literature. In addition, the Redlich-Kister equations are employed to correlate the experimental data, demonstrating excellent agreement with the average absolute relative deviation of 0.370 % for critical temperature and 0.252 % for critical pressure. Finally, the empirical coefficients of the MECP method are refined through correlating with experimental data of CO₂ + hydrocarbon mixture, thereby enhancing prediction accuracy for the critical properties of such mixture.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106668"},"PeriodicalIF":3.4,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168409","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}

{"title":"Supercritical CO2 processing of polylactic acid films: Effect of process variables and the incorporation of R-carvone on crystalline, thermal, and mechanical properties","authors":"Florencia Muratore ,&nbsp;Patricia P. Miranda-Villa ,&nbsp;Nicolás A. Gañán ,&nbsp;Raquel E. Martini ,&nbsp;María L. Goñi","doi":"10.1016/j.supflu.2025.106669","DOIUrl":"10.1016/j.supflu.2025.106669","url":null,"abstract":"<div><div>In this contribution, a systematic investigation of the effect of the supercritical processing and the incorporation of R-(–)-carvone on the crystalline, thermal, and mechanical properties of polylactic acid films at different temperature (40 °C and 60 °C), CO₂ density (278 kg m⁻³ and 683 kg m⁻³) and depressurization rate (0.6 MPa min⁻¹ and 6.0 MPa min⁻¹) conditions was performed. scCO₂-induced crystallization was observed, up to ∼32 %, and different crystal morphologies were obtained depending on the process variables, affecting the mechanical behavior. Statistical analysis showed that temperature-CO₂ density interaction was the main factor affecting crystalline morphology and the mechanical properties, especially the elastic modulus and elongation. Final properties also depended strongly on the carvone loading, suggesting the occurrence of phase separation above ∼10 wt%. The results obtained here provide useful information for a deeper knowledge of the individual effect of the main process variables and the amount of active compound loaded into the polymer matrix on the film final behavior.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106669"},"PeriodicalIF":3.4,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168408","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}

{"title":"Thermohydraulic characterization of supercritical and dense-phase CO2 pipeline transportation with impurities","authors":"Jingnan Li ,&nbsp;Ang Wu ,&nbsp;Yuzhu Wang ,&nbsp;Wei Wei","doi":"10.1016/j.supflu.2025.106666","DOIUrl":"10.1016/j.supflu.2025.106666","url":null,"abstract":"<div><div>With the increasingly serious problem of global climate change, achieving carbon neutrality and peaking has become a common focus of attention for governments and the scientific community. Carbon Capture, Utilization and Storage (CCUS) technology, as an important means to reduce the concentration of carbon dioxide in the atmosphere, plays a crucial role in achieving this goal. Among the various aspects of CCUS technology, the CO₂ transportation process is particularly critical. However, a unified theoretical standard for pipeline transportation of supercritical- and dense-phase CO₂ has not yet been fully established, which limits the wide application and efficiency improvement of CCUS technology to some extent. To fill this theoretical gap, this study adopted computational fluid dynamics numerical simulation techniques to thoroughly investigate the characteristics of supercritical- and dense-phase CO₂ in long-distance pipeline transportation. Through simulation experiments, this study considered the effects of impurities as well as the inclination of the pipeline. The results show that common impurities such as N₂, O₂, and CH₄ affect the phase equilibrium of CO₂, whereas H₂S does not. In addition, the effects of temperature, pressure, and pipe diameter on the thermohydraulic characteristics of CO₂ pipelines were thoroughly investigated in this study, and an accurate thermohydraulic calculation model was developed on this basis. The effects of four common impurities and six different pipeline inclinations on the temperature and pressure changes along the pipeline were further analyzed. These findings provide valuable reference data for the design and operation of long-distance CO₂ pipelines, help ensure the safety and efficiency of the transportation process, provide important technical support for the implementation of future CCUS projects, and help promote the global transition to a low-carbon economy, contributing to the realization of the dual-carbon goal in science.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106666"},"PeriodicalIF":3.4,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134206","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}

{"title":"Synergistic corrosion mechanisms of supercritical water and Na2SO4 deposition layer: Austenitic stainless steels 316 L and 304","authors":"Peng Feng ,&nbsp;Donghai Xu ,&nbsp;Gang Yin ,&nbsp;Kunkun Song ,&nbsp;Ruibo Wang ,&nbsp;Zhiyuan Li ,&nbsp;Pan Wang","doi":"10.1016/j.supflu.2025.106663","DOIUrl":"10.1016/j.supflu.2025.106663","url":null,"abstract":"<div><div>This study investigated the corrosion behavior of 316 L (316LSS) and 304 (304SS) stainless steels under a Na₂SO₄ deposition layer in supercritical water (SCW). The salt layer reduced oxide film densification versus pure SCW, with 304SS exhibiting more severe corrosion (e.g., pitting) due to the absence of Mo which resists pitting corrosion. Without the salt layer, oxide film thicknesses were 6.50 µm (316LSS) and 1.60 µm (304SS); in contrast, 6.52 µm and 9.33 µm, respectively, indicating thicker in SCW with the salt layer. At 723 K and 25 MPa, higher water density increased Ni/Fe ion solubilities, while the salt layer trapped these ions in the microenvironment between the layer and oxide film, generating a locally acidic and oxidizing environment via hydrolysis of Ni/Fe ions. This process accelerated metal ion leaching and oxide dissolution, further enhanced in the presence of SO₄^2-. Na₂SO₄ deposition layer and SCW synergistically intensified corrosion in both alloys.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106663"},"PeriodicalIF":3.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099724","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}

{"title":"Corrigendum to “Multiscale simulation of polyethylene dissolution and dispersion for flash pressure release spinning solutions” [J. Supercrit. Fluids 222 (2025) 106587]","authors":"Jiacheng Zhu,&nbsp;Jin Wen,&nbsp;Chao Jia,&nbsp;Meifang Zhu","doi":"10.1016/j.supflu.2025.106646","DOIUrl":"10.1016/j.supflu.2025.106646","url":null,"abstract":"","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106646"},"PeriodicalIF":3.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941886","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}

{"title":"Hydrolysis kinetics and structure characterization of ball milled bamboo impregnated with various diluted acids","authors":"Wei Yang ,&nbsp;Cong Cong Wang ,&nbsp;Lingjun Wang ,&nbsp;Li Bao ,&nbsp;Fan Yang ,&nbsp;Shengji Wu ,&nbsp;Lei Che","doi":"10.1016/j.supflu.2025.106648","DOIUrl":"10.1016/j.supflu.2025.106648","url":null,"abstract":"<div><div>The hydrolysis mechanism of ball milled bamboo impregnated with deionized water (B-ball), H₂SO₄ (B-H₂SO₄), HCl (B-HCl) and CH₃COOH (B-CH₃COOH) in subcritical water was investigated in the present study. Various mechanochemical reactions were induced during acid-associated mechanical milling and bamboo with improved solubility, reduced thermal stability and solubility was obtained. Acid-associated mechanical treatment also significantly affected the hydrolysis behavior of bamboo in subcritical water. The hydrolysis kinetics of pretreated bamboo could be well expressed by the Coats-Redfern method. The acid strength dominated the hydrolysis of bamboo during ball milling and subcritical water treatment. H₂SO₄ and HCl possessed the highest ability to dissociate the glycosidic bond and holocellulose-lignin chemical linkages. The above ability, together with their catalytic effects resulted in the lower activation energies required to initiate the hydrolysis of B-H₂SO₄ (38.87 kJ mol⁻¹) and B-HCl (38.23 kJ mol⁻¹) compared with those of raw bamboo (74.34 kJ mol⁻¹), B-ball (104.42 kJ mol⁻¹) and B-CH₃COOH (90.65 kJ mol⁻¹) in subcritical water. The cleavage of holocellulose-lignin chemical linkages liberated the polycondensation of monomer and hydrolysable oligomers from holocellulose for glucose char and aromatic-linked polymer char production, leading to the increase of solid residue yield at elevated reaction temperature. It also promoted the glycosidic bond cleavage and ring scission reactions during hydrolysis in subcritical water, resulting in the improved yields of carbohydrate, 5-hydroxymethylfurfural and furfural.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106648"},"PeriodicalIF":3.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069247","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}

{"title":"A review of corrosion and protection of alloys in supercritical carbon dioxide power cycles: From the perspectives of corrosion simulation, dynamic simulation to experimental research","authors":"Zhiyuan Liang,&nbsp;Tingshan Guo,&nbsp;Qinxin Zhao","doi":"10.1016/j.supflu.2025.106647","DOIUrl":"10.1016/j.supflu.2025.106647","url":null,"abstract":"<div><div>The carburization and corrosion resistance of heat-resistant materials are crucial for enhancing the safety of supercritical CO₂ renewable energy power system. Addressing the compatibility issues between heat-resistant materials and supercritical CO₂, this review focuses on material selection, corrosion failure mechanisms, and surface strengthening methods, encompassing both experimental characterization and simulation calculations. The corrosion resistance of heat-resistant materials is predominantly governed by their intrinsic properties, particularly the Cr content. Stress loading aggravates the ion diffusion and carburization rates of heat-resistant materials. Although impurity gases accelerate corrosion rates, temperature remains the primary factor controlling ionic diffusion kinetics. Pre-forming protective oxide layers through surface modification can significantly enhance corrosion resistance. The continuous and dense Cr₂O₃, Al₂O₃ and SiO₂ oxide films hinder the ion diffusion and significantly reduce the carburization and corrosion rates of heat-resistant materials. However, corrosion testing alone provides limited mechanistic insights, whereas computational simulations offer valuable understanding of gas adsorption and initial oxidation behavior in these materials. Machine learning can reduce the influence of test equipment, environment, and operation, improving the systematic and universal applicability of high-temperature corrosion test results. Future research should focus on conducting experiments and simulations of high-temperature corrosion and corrosion fatigue under variable supercritical CO₂ load conditions.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106647"},"PeriodicalIF":3.4,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107320","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}

{"title":"New phase diagrams with anomalous region, supercritical solid-like state, liquid phase boundary, and dwij point","authors":"Vish Prasad ,&nbsp;Guo-Xiang Wang ,&nbsp;Raad S. Haque ,&nbsp;Laura M. Almara","doi":"10.1016/j.supflu.2025.106644","DOIUrl":"10.1016/j.supflu.2025.106644","url":null,"abstract":"<div><div>A Gibbs free energy-based thermodynamic analysis for regular fluids reveals the extension of liquid-vapor (L-V) line, beyond the critical point, to a newly discovered “Dwij point” (DP). At DP, this line turns around and goes back to the melt-solid (S-L) boundary, which together with the S-L and L-V lines delimits the region of liquid/supercritical liquid-like (L/SCLL) state. Consequently, a thermodynamic “solid-like” state is identified, which exists between the L/SCLL and melt-solid lines. Moreover, beyond DP only two phases, gas and solid exist, with the transition occurring via supercritical gas-like and solid-like states. These findings, in conjunction with the anomalous region around the critical point lead to historic modifications to the phase diagram. Consequently, the new phase diagrams for nine fluids are presented. Although the extension of supercritical liquid-like/gas-like boundary for hydrogen is similar, variations do exist. These discoveries may reconcile the thermodynamic transitions and dynamic transitions, which occur beyond DP.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106644"},"PeriodicalIF":3.4,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084504","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}