American Journal of Science, Engineering and Technology最新文献

CFD Analysis of Coolant Flow Characteristics in Reactor Pressure Vessel: A Comprehensive Review 反应堆压力容器中冷却剂流动特性的 CFD 分析：全面回顾

American Journal of Science, Engineering and Technology Pub Date : 2024-04-11 DOI: 10.11648/j.ajset.20240902.11

Md. Rahman, Md. Chowdhury, M. Abedin

{"title":"CFD Analysis of Coolant Flow Characteristics in Reactor Pressure Vessel: A Comprehensive Review","authors":"Md. Rahman, Md. Chowdhury, M. Abedin","doi":"10.11648/j.ajset.20240902.11","DOIUrl":"https://doi.org/10.11648/j.ajset.20240902.11","url":null,"abstract":"This comprehensive review explores the application of Computational Fluid Dynamics (CFD) in analyzing coolant flow within Reactor Pressure Vessels (RPVs) of nuclear power plants. By synthesizing existing research, methodologies, and advancements specific to RPVs, the paper offers in-depth insights into critical aspects such as boundary conditions, turbulence modeling, heat transfer mechanisms, and validation techniques. Examining a range of studies encompassing various reactor types from Pressurized Water Reactors (PWRs) to Integral Pressurized Water Reactors (IPWRs), the review underscores CFD's pivotal role in enhancing safety, efficiency, and performance optimization in nuclear reactors. Through systematic exploration, this study underscores the critical importance of precise modeling in facilitating safety assessments, operational optimization, and design enhancements across various reactor systems. Accurate modeling serves as a cornerstone for informed decision-making processes aimed at maximizing reactor performance while ensuring the highest standards of safety and reliability. The paper navigates through challenges such as computational limitations and turbulence modeling intricacies, while also discussing emerging trends like the porous media method aimed at improving computational efficiency. By offering a comprehensive understanding of thermal-hydraulic behavior in nuclear reactors, the review underscores CFD's contribution to enhancing safety and reliability in nuclear power generation. Overall, this review underscores the indispensable role of CFD in advancing our understanding of nuclear reactor dynamics, thereby contributing significantly to the overarching goals of improved safety and reliability in nuclear power generation.","PeriodicalId":512243,"journal":{"name":"American Journal of Science, Engineering and Technology","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140713135","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

Investigating the Effect of Palm Kernel Shell Powder on the Rheological and Filtration Properties of Water Based Mud 研究棕榈仁壳粉对水基泥流变和过滤特性的影响

American Journal of Science, Engineering and Technology Pub Date : 2024-04-02 DOI: 10.11648/j.ajset.20240901.14

Sarah Akintola, Omotosho James, Omojola Fatai

{"title":"Investigating the Effect of Palm Kernel Shell Powder on the Rheological and Filtration Properties of Water Based Mud","authors":"Sarah Akintola, Omotosho James, Omojola Fatai","doi":"10.11648/j.ajset.20240901.14","DOIUrl":"https://doi.org/10.11648/j.ajset.20240901.14","url":null,"abstract":"During drilling operations, the use of drilling fluid plays a critical role, and over time, there has been considerable interest in enhancing drilling fluid characteristics in order to improve performance, reduce costs, and prevent environmental pollution. Deviating from conventional additives, recent studies have explored the use of alternative materials, as drilling fluid additives. In line with this trend, this study focuses on the laboratory investigation of the rheological and filtration properties of water-based drilling fluid treated with Palm Kernel Shell Powder (PKSP) with high viscosity polyanionic cellulose (PAC HV), used as control. To assess the impact of PKSP in water-based mud, experiments were carried out using concentrations spanning from 0.5g to 2.5g, temperatures of 27°C, 40°C, 60°C, and 80°C, and aging of 24, 48, and 72 hours. From the results the plastic viscosity of mud samples treated with PKSP were temperature dependent and also with increasing aging. The addition of PKSP showed improved performance in terms of reducing the filtrate volume as well as the cake thickness with increasing concentration of the additives, and the concentration that gave the best results across all aging duration was 2.5g. The mud weight and pH of all samples remained relatively constant, with no significant changes observed. However, PAC HV showed better results in all the cases of fluid loss and mud cake thickness. It could be attributed to the soluble contents in the PAC HV which increased the viscosity significantly and thus, kept the solid particles in suspension.","PeriodicalId":512243,"journal":{"name":"American Journal of Science, Engineering and Technology","volume":"40 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752160","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

Development of Process Safety Cumulative Risk Assessment and Visualization Model/Framework for Petroleum Facilities in Niger-Delta Region, Nigeria 为尼日利亚尼日尔河三角洲地区的石油设施开发工艺安全累积风险评估和可视化模型/框架

American Journal of Science, Engineering and Technology Pub Date : 2024-03-19 DOI: 10.11648/j.ajset.20240901.13

Emeka Maduabuchi, Gogomary Oyet Israel

{"title":"Development of Process Safety Cumulative Risk Assessment and Visualization Model/Framework for Petroleum Facilities in Niger-Delta Region, Nigeria","authors":"Emeka Maduabuchi, Gogomary Oyet Israel","doi":"10.11648/j.ajset.20240901.13","DOIUrl":"https://doi.org/10.11648/j.ajset.20240901.13","url":null,"abstract":"One of the key challenges in preventing major process safety accidents in an operating plant is the lack of an integrated system/model that brings together the risks posed by the deficiencies / deviations on the safety critical barriers, for operational decision making. Based on this context, an exploratory study was undertaken to develop a model/framework for visualizing the accumulation of process safety risks arising from safety critical barriers impairments in petroleum facilities in Niger-Delta Nigeria. A “focused group” was used to test/validate the model/framework using two case studies. The results indicate that the process safety cumulative risk assessment framework/model offers a transparent mechanism for assessing and visualizing the cumulative risks arising from the barrier impairment problems. For the facility in the first case study, 3.2% of the total number of safety-critical barriers was deviated and the model revealed risk accumulation in the gas compression functional location. For the facility in the second case study, 1.7% of the total number of safety-critical barriers was deviated and the model revealed risk accumulation in the gas dehydration functional location. When applied properly, the model/framework will reduce the risk of major accident in petroleum facilities by (a) aiding better management of safety critical barriers deviations through improved risks visual and (b) eliminate variability in human interpretation of process safety risk levels. One improvement area identified in the model/framework is the need for a web-based software for automation of barrier impairment data collection and real-time visualization of the cumulative risk picture.\u0000","PeriodicalId":512243,"journal":{"name":"American Journal of Science, Engineering and Technology","volume":"135 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140228559","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 Comparative Study on the Application of Intelligent Models in the Estimation of Backbreak in Mine Blasting Operations 关于在矿山爆破作业中应用智能模型估算回采量的比较研究

American Journal of Science, Engineering and Technology Pub Date : 2024-01-18 DOI: 10.11648/j.ajset.20240901.11

Festus Kunkyin-Saadaari, Victor Kwaku Agadzie, Richard Gyebuni

引用次数: 0

S-Box Generation Algorithm by Constructing the Non-Singular Adjacency Matrix Using the Genetic Algorithm 利用遗传算法构建非正弦邻接矩阵的 S-Box 生成算法

American Journal of Science, Engineering and Technology Pub Date : 2024-01-18 DOI: 10.11648/j.ajset.20240901.12

J. Abdurazzokov

引用次数: 0