Journal of Pipeline Science and Engineering最新文献_第4页

Failure mechanism of sealing rubber exposed to supercritical CO₂ during rapid depressurization based on equivalent thermo-mechanical coupling damage model 基于等效热-力耦合损伤模型的超临界co2作用下密封橡胶快速减压失效机理

IF 4.9

Journal of Pipeline Science and Engineering Pub Date : 2026-05-01 Epub Date: 2025-05-19 DOI: 10.1016/j.jpse.2025.100300

Xiong Xiao , Li Mo , Shenbin Xiao , Changjun Li , Liqiong Jiang , Chao Chen

{"title":"Failure mechanism of sealing rubber exposed to supercritical CO₂ during rapid depressurization based on equivalent thermo-mechanical coupling damage model","authors":"Xiong Xiao , Li Mo , Shenbin Xiao , Changjun Li , Liqiong Jiang , Chao Chen","doi":"10.1016/j.jpse.2025.100300","DOIUrl":"10.1016/j.jpse.2025.100300","url":null,"abstract":"<div><div>The widespread application of supercritical carbon dioxide (S-CO₂) in carbon capture, utilization, and storage (CCUS) technologies imposes increasing requirements on pipeline sealing materials. As crucial sealing components, rubber O-rings are prone to damage during the rapid depressurization process due to the high permeability of S-CO₂ and sudden pressure changes, leading to sealing failure. However, the synergistic mechanism regarding deformation, diffusion, and material damage in rubber O-rings with cavity defects when permeated by S-CO₂ during rapid depressurization has not been thoroughly investigated. To address this issue, this study develops an equivalent coupled thermo-mechanical damage model by utilizing the similarity between Fick’s diffusion law and Fourier’s theory of heat conduction. This model systematically investigates the diffusion-deformation coupling behavior of cavity-containing rubber O-rings, considering the effects of the cavity position, orientation, depressurization rate, and material properties on the internal strain of the cavity. The results reveal that centrally positioned cavity in the compressive stress field exhibits lower strain compared to the cavity offset by 0.4 mm. A relatively fast depressurization rate gives rise to a greater transient pressure difference, inducing elevated strain levels that escalate the failure risks of the O-ring with a cavity. Material selection plays a critical role: NBR shows better sealing performance than EPDM and SBR, with EPDM experiencing cavity rupture under S-CO₂ rapid depressurization. These findings provide theoretical breakthroughs and methodological innovations for sealing system design in S-CO₂ based CCUS infrastructure, advancing both sealing reliability and operational robustness to facilitate CCUS technology development.</div></div>","PeriodicalId":100824,"journal":{"name":"Journal of Pipeline Science and Engineering","volume":"6 3","pages":"Article 100300"},"PeriodicalIF":4.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147757010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A numerical study on flow and heat transfer characteristics of the LNG storage tank feed pipeline LNG储罐进料管道流动及传热特性的数值研究

IF 4.9

Journal of Pipeline Science and Engineering Pub Date : 2026-05-01 Epub Date: 2025-10-28 DOI: 10.1016/j.jpse.2025.100396

Hongyu Zhou, Xu Sun, Tao Di, Xiaoben Liu, Hong Zhang

{"title":"A numerical study on flow and heat transfer characteristics of the LNG storage tank feed pipeline","authors":"Hongyu Zhou, Xu Sun, Tao Di, Xiaoben Liu, Hong Zhang","doi":"10.1016/j.jpse.2025.100396","DOIUrl":"10.1016/j.jpse.2025.100396","url":null,"abstract":"<div><div>As a low-carbon fuel, liquefied natural gas (LNG) requires strict temperature control during transportation. Direct injection into pipelines at ambient temperature induces significant thermal stress, potentially causing permanent damage. This study employs numerical simulation to investigate the flow and heat transfer characteristics of LNG feed pipeline during pre-cooling, cold holding, and unloading stages. Significant flow maldistribution and temperature stratification occur during pre-cooling and cold holding, with maximum circumferential and wall-thickness temperature differences reaching 40 K and 23 K, respectively, and a maximum temperature drop rate of 27 K/h. During unloading, the flow reaches full-pipe conditions. While circumferential temperature differences become minimal, the wall-thickness gradient reaches 53 K, with a maximum drop rate of 30 K/min. Cold holding temperature critically affects structural safety, as an excessively rapid temperature drop during unloading may induce thermal stress beyond the material yield limit. To mitigate this risk, a minimum of 23 h of pre-cooling and cold holding is recommended, accompanied by real-time temperature monitoring to ensure thermal stability. Flow rate and fluid temperature are key parameters affecting heat transfer. Inlet temperature exerts a stronger influence on wall temperature than flow rate, suggesting that increasing flow or lowering inlet temperature can improve cooling efficiency. Although unloading rate affects heat transfer, its impact on wall temperature fluctuations is limited. Moreover, complex pipeline structures, such as elbows and T-junctions, induce secondary vortices and flow disturbances, enhancing turbulence and thermal mixing. These effects improve local convective heat transfer and highlight the importance of geometric design in cryogenic pipeline systems.</div></div>","PeriodicalId":100824,"journal":{"name":"Journal of Pipeline Science and Engineering","volume":"6 3","pages":"Article 100396"},"PeriodicalIF":4.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147757109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the phenomena and mechanism of reformation during hydrate dissociation of N-vinyl caprolactam system in pipeline 管道n -乙烯基己内酰胺体系水合物解离过程中重整现象及机理研究

IF 4.9

Journal of Pipeline Science and Engineering Pub Date : 2026-05-01 Epub Date: 2025-04-07 DOI: 10.1016/j.jpse.2025.100286

Yuchuan Qian , Yuxing Li , Haiyuan Yao , Wuchang Wang , Guangchun Song

{"title":"Study on the phenomena and mechanism of reformation during hydrate dissociation of N-vinyl caprolactam system in pipeline","authors":"Yuchuan Qian , Yuxing Li , Haiyuan Yao , Wuchang Wang , Guangchun Song","doi":"10.1016/j.jpse.2025.100286","DOIUrl":"10.1016/j.jpse.2025.100286","url":null,"abstract":"<div><div>Natural gas hydrate blockage is a major threat to the flow safety of long-distance transmission pipelines in deep water. Although the addition of hydrate inhibitors can effectively mitigate hydrate blockage in pipelines, during the dissociation of these inhibitor-containing hydrates, the inhibitor slows the hydrate dissociation rate, which is detrimental to hydrate removal from pipelines in the field. The dissociation characteristics of hydrates in inhibitor-containing systems require further investigation. This work investigated the dissociation of hydrates in a system containing the kinetic inhibitor monomer N-vinyl caprolactam (NVCap). The dissociation process of hydrates under high subcooling conditions could be divided into three stages: 1) initial hydrate dissociation, 2) hydrate reformation, and 3) residual hydrate dissociation, whereas hydrate reformation does not occur under low subcooling conditions. The differences in the dissociation phenomena between the NVCap system and the pure water system in these three stages were compared, and the reason why the hydrate reformation stage of the NVCap system lasts longer was discovered and explained. The phenomenon of a sudden increase in the number of bubbles in the reformation stage was explained, and the coordination relationship between the different effect of inhibitor concentration on dissociation in different stages was discussed. This study combined the analysis of temperature and pressure changes with the analysis of macroscopic gas phase transport laws. It also combined the microscopic observations via particle video microscopy to demonstrate the dissociation kinetics of inhibitor-containing hydrates, providing a theoretical basis for controlling the dissociation of hydrate inhibitors in deep-water pipelines and ensuring safe flow.</div></div>","PeriodicalId":100824,"journal":{"name":"Journal of Pipeline Science and Engineering","volume":"6 3","pages":"Article 100286"},"PeriodicalIF":4.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147757111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation study on leakage and diffusion of medium and low pressure buried gas pipelines considering soil cavitation effect 考虑土壤空化效应的中低压埋地输气管道泄漏扩散数值模拟研究

IF 4.9

Journal of Pipeline Science and Engineering Pub Date : 2026-03-01 Epub Date: 2025-09-10 DOI: 10.1016/j.jpse.2025.100364

Fanxi Bu , Qingxiu Lu , Runqiang Liu , Zhuoran Lv , Chunmiao Leng , Zhihua Wang

{"title":"Numerical simulation study on leakage and diffusion of medium and low pressure buried gas pipelines considering soil cavitation effect","authors":"Fanxi Bu , Qingxiu Lu , Runqiang Liu , Zhuoran Lv , Chunmiao Leng , Zhihua Wang","doi":"10.1016/j.jpse.2025.100364","DOIUrl":"10.1016/j.jpse.2025.100364","url":null,"abstract":"<div><div>Buried gas pipelines often experience leakage accidents due to factors such as corrosion, natural disasters, and third-party damage, leading to dangerous events such as fires, explosions, and soil erosion causing road and house collapses, resulting in casualties and economic losses. The influence of cavitation caused by gas leakage impacting the soil in buried gas pipelines on the diffusion characteristics of gas leakage is investigated using numerical simulation in this study. Based on the results of numerical simulations, a multi-factor quantitative relationship for the range of diffusion risk is established using the least square method and multiple regression theory. When the height of soil cavitation area is increased from 10 mm to 200 mm, the distribution range of 0.1 MPa pressure contour is increased by 4 times, the maximum velocity is increased from 17 m/s to 238 m/s. Additionally, when leakage occurs for a duration of 3,600 s, there is a significant increase in the farthest dangerous range (FDR) by approximately 38%. In the same leakage time, the FDR is the largest when the soil above the pipeline is sandy, followed by loam and clay. In this paper, the FDR prediction model was established with an average error of 2.65%, and the AutoGluon method was used to compare and verify the prediction results. The research results provide a theoretical basis for leak detection of buried gas pipelines and prevention of secondary explosion accidents, and have practical engineering significance for emergency accident handling and the development of on-site personnel evacuation plans.</div></div>","PeriodicalId":100824,"journal":{"name":"Journal of Pipeline Science and Engineering","volume":"6 2","pages":"Article 100364"},"PeriodicalIF":4.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147556374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Factors influencing pipe stress responses in pipe jacking in bedrock: Field monitoring and numerical simulation 基岩顶管应力响应影响因素：现场监测与数值模拟

IF 4.9

Journal of Pipeline Science and Engineering Pub Date : 2026-03-01 Epub Date: 2025-06-28 DOI: 10.1016/j.jpse.2025.100320

Shuang Zheng , Chuanqi Wang , Zhimin Luo , Yongjie Zhang , Jianhua Chen , Xin Li

{"title":"Factors influencing pipe stress responses in pipe jacking in bedrock: Field monitoring and numerical simulation","authors":"Shuang Zheng , Chuanqi Wang , Zhimin Luo , Yongjie Zhang , Jianhua Chen , Xin Li","doi":"10.1016/j.jpse.2025.100320","DOIUrl":"10.1016/j.jpse.2025.100320","url":null,"abstract":"<div><div>To investigate the stress response of pipes during jacking in bedrock, longitudinal stresses of deep pipes were analyzed through field monitoring and numerical simulations conducted at various locations. The results indicate that stress concentrations occur at the bottom of the pipe within bedrock strata. There is a significant difference in stress characteristics between the vault and the bottom of the pipe jacking, with stresses at the vault increasing suddenly and at the bottom decreasing suddenly. The maximum stress at the vault can reach 10.38 MPa, while the normal stress at the bottom is limited to 2 MPa. Key factors influencing longitudinal stress include the contact area between the pipe and strata, the pipe joint interface relationships, the nature of the jacking force, and the pipe burial depth. Longitudinal stress exhibits a positive correlation with jacking force intensity and buried depth, while it exhibits a negative correlation with the contact area between the pipe and the strata. Changes in the interfacial contact relationship of the pipe joints have a minor effect on the longitudinal stresses, as these stresses are primarily transferred through the contact regions of the pipe joints. Additionally<strong>,</strong> longitudinal stress primarily originates from the unweakened region and escalates with the height of the jacking. Under uniform load conditions, the stress magnitude aligns with the results observed under concentrated loads at heights between 1/5 and 1/3 of the diameter. The findings of this study can provide valuable practical guidance under challenging conditions.</div></div>","PeriodicalId":100824,"journal":{"name":"Journal of Pipeline Science and Engineering","volume":"6 2","pages":"Article 100320"},"PeriodicalIF":4.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147556368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A simplified predictive model of thermal cycling on initiation of stress corrosion cracking 热循环对应力腐蚀裂纹萌生的简化预测模型

IF 4.9

Journal of Pipeline Science and Engineering Pub Date : 2026-03-01 Epub Date: 2025-09-29 DOI: 10.1016/j.jpse.2025.100383

Zhenjin Zhu , Steven Cooper , Brian Cooper , TK Akins

{"title":"A simplified predictive model of thermal cycling on initiation of stress corrosion cracking","authors":"Zhenjin Zhu , Steven Cooper , Brian Cooper , TK Akins","doi":"10.1016/j.jpse.2025.100383","DOIUrl":"10.1016/j.jpse.2025.100383","url":null,"abstract":"<div><div>This paper develops a simplified predictive model to investigate the role of thermal cycling in the evolution of corrosive environment for the initiation of stress corrosion cracking (SCC) on the external surface of steel pipelines. Prior to commissioning, coatings may be disbonded in places due to improper material selection or poor application. Corrosive gases (i.e., O<sub>2</sub>, CO<sub>2</sub>) and water vapor diffuse into coating disbondment areas from the soil side. The diffused amount of each species is obtained by Fick’s First Law. The accumulation of condensed water vapor depends on the solubility change of water vapor with respect to thermal cycling frequency and magnitude. The concentrations of [H<sup>+</sup>], [HCO<sub>3</sub><sup>−</sup>], and [CO<sub>3</sub><sup>2</sup><sup>−</sup>] are dependent on CO<sub>2</sub> partial pressure. The metal surface potential is predicted using a resistance circuit model. When an open coating holiday occurs, the cathodic protection (CP) current flows directly to the metal surface through the exposed electrolyte. The local surface potentials inside the crevice are simulated using a parametric equation. The pH value at an open holiday obeys Faraday’s Second Law of Electrolysis. Local tensile stress may come from hoop stress from design, residual stress from manufacturing and fabrication, thermal stress from operation, geotechnical stress from soil movement, and mechanical stress from deformation. When the pH, surface potential, and tensile stress are within specific ranges, SCC can occur either longitudinally or circumferentially, depending on stress orientation. Types of SCC, such as high-pH and near-neutral pH SCC, are characterized. The model was validated qualitatively by comparing the predicted results with field measurements from published industry literature. The findings should help stakeholders develop proactive preventive and mitigative measures for effective SCC management.</div></div>","PeriodicalId":100824,"journal":{"name":"Journal of Pipeline Science and Engineering","volume":"6 2","pages":"Article 100383"},"PeriodicalIF":4.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147556367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental data-driven streamlined approach for tampering detection in oil and gas pipelines 实验数据驱动的油气管道篡改检测方法

IF 4.9

Journal of Pipeline Science and Engineering Pub Date : 2026-03-01 Epub Date: 2025-06-09 DOI: 10.1016/j.jpse.2025.100310

Bhumiben Ankit Shah , Asan G.A. Muthalif , Sadok Sassi , Musaab Zarog

{"title":"Experimental data-driven streamlined approach for tampering detection in oil and gas pipelines","authors":"Bhumiben Ankit Shah , Asan G.A. Muthalif , Sadok Sassi , Musaab Zarog","doi":"10.1016/j.jpse.2025.100310","DOIUrl":"10.1016/j.jpse.2025.100310","url":null,"abstract":"<div><div>Pipelines are essential links of the energy sector for transporting and distributing energy products across countries and from refineries to terminals. With the increasing value of energy products, pipelines become vulnerable targets for tampering activities. Oil and gas pipelines are exposed to various forms of tampering events. These incidents can result in significant safety risks and economic losses. Continuous monitoring and detection of these events is essential due to the critical nature of these systems. Even minor disturbances may lead to severe problems. Therefore, it is important not to overlook any minor deviation in the data.</div><div>The proposed approach develops an experimental data-driven framework to capture and interpret minor deviations in vibration signals that reflect early signs of abnormality. This streamlined approach covers all aspects, from initial data collection using accelerometers positioned along the pipeline to advanced statistical analysis. Initial statistical evaluation is followed by spectrogram-based time-frequency analysis to visualize transient changes. Upon detecting significant changes, analysis of variance (ANOVA) testing and post-hoc analysis quantify group differences.</div><div>The proposed method efficiently monitors and addresses changes in collected data under three distinct conditions of the pipe during experimental analysis. Findings reveal substantial differences in measurements corresponding to different pipeline states. Results highlight the methodology’s effectiveness in identifying both major faults and subtle variations arising from tampering or other conditions. This study provides valuable insights into pipeline monitoring and offers a strong foundation for future research and practical applications, demonstrating a scalable basis for integrating advanced analytics into pipeline safety systems.</div></div>","PeriodicalId":100824,"journal":{"name":"Journal of Pipeline Science and Engineering","volume":"6 2","pages":"Article 100310"},"PeriodicalIF":4.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147556370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Adaptability of simulation state equation of hydrogen-blended natural gas pipeline 混氢天然气管道仿真状态方程的适应性

IF 4.9

Journal of Pipeline Science and Engineering Pub Date : 2026-03-01 Epub Date: 2025-08-26 DOI: 10.1016/j.jpse.2025.100346

Bolin Qiu, Ruofei Chen, Hao Lv, Jianlu Zhu, Yuxing Li

{"title":"Adaptability of simulation state equation of hydrogen-blended natural gas pipeline","authors":"Bolin Qiu, Ruofei Chen, Hao Lv, Jianlu Zhu, Yuxing Li","doi":"10.1016/j.jpse.2025.100346","DOIUrl":"10.1016/j.jpse.2025.100346","url":null,"abstract":"<div><div>At present, hydrogen transportation in natural gas pipeline network is the main mode of hydrogen energy transportation. Accurate description of the physical parameters of mixed gas is the key to the simulation of hydrogen-blended natural gas pipeline network. This paper discusses the calculation accuracy of Benedict-Webb-Rubin-Starling (BWRS) equation of state (EOS) and GERG-2008 EOS for the physical parameters of hydrogen-blended natural gas in the range of 0–100% hydrogen content, 0.25–50.58 MPa pressure and 173.15–349.95 K temperature. Based on the steady-state simulation model of hydrogen-blended natural gas pipeline, the influence of two state equations on the accuracy of pipeline simulation is discussed. The results show that the average absolute relative error of GERG-2008 EOS for the calculation of hydrogen-blended natural gas density is 0.23%, and the average absolute relative error of BWRS EOS for density is 0.90%. With the increase of pressure, the average absolute relative error of BWRS EOS increases by about 0.08%/MPa; For the pipeline in this case, as the pipeline operating pressure increases, the average absolute relative error of pressure and the average absolute relative error of temperature increase; when the hydrogen content is less than 30%, the maximum average absolute relative error of pressure caused by BWRS EOS is 0.03 MPa, and the maximum average absolute relative error of temperature is 0.87 °C. Therefore, it is recommended to use GERG-2008 EOS to simulate hydrogen-blended natural gas pipelines.</div></div>","PeriodicalId":100824,"journal":{"name":"Journal of Pipeline Science and Engineering","volume":"6 2","pages":"Article 100346"},"PeriodicalIF":4.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147556443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of hydrogen trap density on efficiency of irreversible traps in a line-pipe steel 疏水阀密度对不可逆疏水阀效率的影响

IF 4.9

Journal of Pipeline Science and Engineering Pub Date : 2026-03-01 Epub Date: 2025-08-27 DOI: 10.1016/j.jpse.2025.100348

A. Durga Prasad , G. Sudhakar Rao , Bhagyaraj Jayabalan , Subrata Mukherjee

{"title":"Effect of hydrogen trap density on efficiency of irreversible traps in a line-pipe steel","authors":"A. Durga Prasad , G. Sudhakar Rao , Bhagyaraj Jayabalan , Subrata Mukherjee","doi":"10.1016/j.jpse.2025.100348","DOIUrl":"10.1016/j.jpse.2025.100348","url":null,"abstract":"<div><div>Hydrogen embrittlement (HE) presents a significant challenge for the enduring reliability of high-strength steels employed in pipelines and energy infrastructure. This challenge arises from the intricate interactions among microstructural traps that control hydrogen entry, storage, and release. Although the phenomenon of hydrogen trapping is well-explored, the significance of trap competition and the dynamic movement of hydrogen between reversible and irreversible traps is only recently acknowledged as a crucial factor influencing susceptibility to embrittlement. In this study, we examined hydrogen trap competition through thermal desorption spectroscopy (TDS) and in situ transmission electron microscope (TEM) experiments. Two microstructures from line-pipe X70 grade steel with differing grain boundary areas were produced, with one of the steels exhibiting a relatively higher percentage (about 64%) of high-angle grain boundaries (HAGBs). The local accumulation of hydrogen at HAGBs seemed to result in a reduction of the effective hydrogen diffusion coefficient by 40%, from 1.6 × 10<sup>−</sup><sup>11</sup> to 0.92 × 10<sup>−</sup><sup>11</sup> m<sup>2</sup> s<sup>−</sup><sup>1</sup>. This likely diminished the likelihood of hydrogen engaging with the precipitates within the grain matrix. Consequently, a 50% reduction in trapped hydrogen at irreversible sites was observed.</div></div>","PeriodicalId":100824,"journal":{"name":"Journal of Pipeline Science and Engineering","volume":"6 2","pages":"Article 100348"},"PeriodicalIF":4.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147556371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A two-fluid model incorporating droplet entrainment to predict pressure drop and holdup for CO2 two-phase flow in horizontal and vertical pipe 考虑液滴夹带的两流体模型预测水平和垂直管道中CO2两相流的压降和含率

IF 4.9

Journal of Pipeline Science and Engineering Pub Date : 2026-03-01 Epub Date: 2025-06-04 DOI: 10.1016/j.jpse.2025.100304

Changjun Li , Yupeng Liao , Wenlong Jia , Fan Yang , Jie He , Xiujuan Wang

{"title":"A two-fluid model incorporating droplet entrainment to predict pressure drop and holdup for CO2 two-phase flow in horizontal and vertical pipe","authors":"Changjun Li , Yupeng Liao , Wenlong Jia , Fan Yang , Jie He , Xiujuan Wang","doi":"10.1016/j.jpse.2025.100304","DOIUrl":"10.1016/j.jpse.2025.100304","url":null,"abstract":"<div><div>CCUS technology is currently the best practice for reducing CO<sub>2</sub> emissions, with pipeline transportation as the primary method for the long-distance, large-scale transport of captured CO<sub>2</sub> to storage sites. However, the two-phase flow often occurs during the transportation and storage of CO<sub>2</sub>. To accurately calculate the flow parameters of CO<sub>2</sub> two-phase flow, particularly the pressure drop gradient and liquid holdup, a new CO<sub>2</sub> two-fluid model incorporating droplet entrainment is developed. Additionally, a new numerical method is proposed to determine the fraction of droplet entrainment. The new model is validated with extensive experimental data from horizontal and vertical CO<sub>2</sub> pipelines with an error of ±17% for horizontal flows and around ±4% for vertical flows in pressure gradients prediction. The average prediction error for liquid holdup is less than ±8%. The effects of entrainment fraction, friction coefficient, pipeline inclination, liquid holdup, and flow pattern on the model’s prediction performance are discussed. Overall, the new model significantly enhances the accuracy of predicting the pressure drop gradient, especially in the low liquid holdup and the annular flow pattern, highlighting the importance of considering droplet entrainment in CO<sub>2</sub> two-phase flow pipelines. The proposed model offers a more reliable solution for CO<sub>2</sub> two-phase flow and can be applied to other two-phase flows.</div></div>","PeriodicalId":100824,"journal":{"name":"Journal of Pipeline Science and Engineering","volume":"6 2","pages":"Article 100304"},"PeriodicalIF":4.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147556372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0