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CFD modeling of natural convection in pebble bed geometry with finite volume method 基于有限体积法的球床几何自然对流CFD建模

4区工程技术

Kerntechnik Pub Date : 2023-10-09 DOI: 10.1515/kern-2023-0039

Salih Said Çatalbas, Ali Tiftikci

{"title":"CFD modeling of natural convection in pebble bed geometry with finite volume method","authors":"Salih Said Çatalbas, Ali Tiftikci","doi":"10.1515/kern-2023-0039","DOIUrl":"https://doi.org/10.1515/kern-2023-0039","url":null,"abstract":"Abstract In this study, we used the finite volume method to computationally model natural convective flow in packed bed geometry. Using the OpenFOAM® v2112 code, we performed the computational analysis. We successfully meshed the intricate packed bed flow geometry, which consists of several spheres positioned at random. The spheres have sizes of 0.006 and 0.01 m, and the associated Rayleigh numbers are 1.83 × 107 and 8.48 × 107 respectively. We used the packed bed heights of H/d = 5, 10, and 20 in the simulations. By comparing the results of the OpenFOAM® v2112 simulations of the natural convection flow for all self-heating sphere in a packed bed, we demonstrated that the velocity distributions and Nusselt values are in good agreement with the experimental data. Additionally, it was evident from the velocity and temperature distributions in a packed bed core that there was a major temperature rise at nearby low velocity fields and a minor velocity rise in the intermediate and upper elevations. We showed that increasing the height of the pebble-bed core and correspondingly increasing the quantity of spheres inside it makes the flow more difficult and also generates local hot spots. This study is notable for using the finite volume method to evaluate natural convection flow in all self-heating packed beds and for simulating packed bed flow using a significant number of spheres. These two factors contribute to the originality of this work.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135044122","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}

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Frontmatter 头版头条

4区工程技术

Kerntechnik Pub Date : 2023-10-01 DOI: 10.1515/kern-2023-frontmatter5

引用次数: 0

Ecological interface design and evaluation for feedwater dearating system in NPPs 核电厂给水系统生态界面设计与评价

4区工程技术

Kerntechnik Pub Date : 2023-10-01 DOI: 10.1515/kern-2023-0009

Zhihui Xu, Gang Wu, Junzhou He, Huaqing Peng, Min Yang, Shengyuan Yan

{"title":"Ecological interface design and evaluation for feedwater dearating system in NPPs","authors":"Zhihui Xu, Gang Wu, Junzhou He, Huaqing Peng, Min Yang, Shengyuan Yan","doi":"10.1515/kern-2023-0009","DOIUrl":"https://doi.org/10.1515/kern-2023-0009","url":null,"abstract":"Abstract A good human-computer interface can improve the efficiency of operators in the main control room of a nuclear power plant (NPP) and reduce operational errors. It has been shown that ecological interface design (EID) can effectively reduce the cognitive load of users, improve the level of situation awareness, and help users to make decisions quickly and effectively. In this paper, we analyzed the feedwater deaeration system (ADG) of nuclear power plants, constructed the work domain analysis according to the abstraction hierarchy theory. The factors that affect the balance of the system are clarified, and the ecological interface is designed based on it, so that it can present the system status and present the future development trend more intuitively, and support the operator to predict the system situation. In this study, 10 volunteers with relevant knowledge background were selected for operational experiments, with subjective evaluation based on SART scale and grey theory, which verified that EID interface has significant advantages over the original interface in supporting both operator response time and accuracy.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"228 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134934568","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}

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Heat transfer and pressure drop analysis of a microchannel heat sink using nanofluids for energy applications 利用纳米流体进行能量应用的微通道散热器的传热和压降分析

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2023-09-05 DOI: 10.1515/kern-2023-0034

S. Thakre, Amar Pandhare, Prateek D. Malwe, N. Gupta, Chandrakant Kothare, Pramod B. Magade, A. Patel, Radhey Shyam Meena, Ibham Veza, Natrayan L., H. Panchal

{"title":"Heat transfer and pressure drop analysis of a microchannel heat sink using nanofluids for energy applications","authors":"S. Thakre, Amar Pandhare, Prateek D. Malwe, N. Gupta, Chandrakant Kothare, Pramod B. Magade, A. Patel, Radhey Shyam Meena, Ibham Veza, Natrayan L., H. Panchal","doi":"10.1515/kern-2023-0034","DOIUrl":"https://doi.org/10.1515/kern-2023-0034","url":null,"abstract":"Abstract The present research aims to enhance heat transfer in straight and wavy profile heat sinks using the same length and hydraulic diameter with different microchannel geometries (triangular, rectangular, trapezoidal, semi-circular, and circular) for uses in electronics, inkjet printing, high heat flux cooling of lasers, and other domains. The nanofluid employed is water/aluminum oxide (water/Al2O3), and the flow regime is laminar. The range of Reynolds number (Re) in this study was 220 ≤ Re ≤ 550, and the concentrations of nanoparticle Al2O3 with Heavy Water (2H2O) were 1.2 % volume. This investigation uses 3-dimensional Computational Fluid Dynamics (CFD) simulation software to investigate the heat transfer characteristics of several cross-sectioned microchannels. The numerical investigation utilizes the finite volume approach, and the CFD analysis is validated with accessible literature with different wavy profiles. According to the CFD simulation results, the microchannel with a circular cross-section has the highest heat transfer performance (up to 18 %) among the other cross-sections. The circular cross-section microchannel seemed to have the most significant increase in coolant temperature (by 9–22 %). The analysis outcomes prove that the microchannel with a circular cross-section has the highest performance for heat transfer; the triangular channel has the lowest performance under the same geometric parameters and boundary conditions. So, it is suggested that a circular microchannel can be used for a heat-carrying capacity of 150 W/cm2, a hydraulic diameter of 500 µm, and a Reynolds number equal to 500.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"83 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83482635","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: 1

Unfiltered air inleakage analysis of the control room envelope of Kuosheng nuclear power plant 国胜核电站控制室围护结构未过滤空气泄漏分析

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2023-08-24 DOI: 10.1515/kern-2023-0044

Yu-Ching Tsai, Chunqing Yang

{"title":"Unfiltered air inleakage analysis of the control room envelope of Kuosheng nuclear power plant","authors":"Yu-Ching Tsai, Chunqing Yang","doi":"10.1515/kern-2023-0044","DOIUrl":"https://doi.org/10.1515/kern-2023-0044","url":null,"abstract":"Abstract The control room envelope (CRE) of a nuclear power plant is quite important during all kinds of the accidents. Only with the guaranteed habitability of the CRE, the operators can shut down the reactor safely during an accident with the release of hazardous chemicals or radioactive gases. In this study, Kuosheng nuclear power plant (NPP) in Taiwan had performed the inleakage test by using tracer gas technique, and six cases with different heating, ventilation and air conditioning system (HVAC) lineups were tested in this study. The test results showed that the unfiltered inleakage rate for the pressurization modes ranged from 0.063 m3/s to 0.098 m3/s and were all within the acceptance criteria of 0.212 m3/s. For the isolation modes, the unfiltered inleakage rate ranged from 0.240 m3/s to 0.321 m3/s and were still within the acceptance criteria of 0.944 m3/s. The test result provided useful information to improve the vulnerability of the CRE. It also showed that a decrease in the positive differential pressure of the CRE relative to its surroundings did not inevitably increase the unfiltered inleakage rate of the CRE if the critical boundary, such as the negative differential portions of the ventilation system, were still well sealed.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"70 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79953680","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

Application of internal fire probabilistic risk assessment in design optimization for marine SMR 内火概率风险评估在船舶小型堆设计优化中的应用

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2023-08-18 DOI: 10.1515/kern-2023-0031

Chao Wang, Xiaoming Zhang, Chao Xiong

引用次数: 0

Design study of small modular gas-cooled fast reactor employing modified CANDLE burnup with radial direction shuffling scheme 采用改进型CANDLE燃料箱径向变换方案的小型模块化气冷快堆设计研究

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2023-08-17 DOI: 10.1515/kern-2023-0017

F. H. Irka, Z. Su’ud, D. Irwanto, S. Khotimah, H. Sekimoto

{"title":"Design study of small modular gas-cooled fast reactor employing modified CANDLE burnup with radial direction shuffling scheme","authors":"F. H. Irka, Z. Su’ud, D. Irwanto, S. Khotimah, H. Sekimoto","doi":"10.1515/kern-2023-0017","DOIUrl":"https://doi.org/10.1515/kern-2023-0017","url":null,"abstract":"Abstract Design Study of Small Modular Gas-cooled Fast Reactors Employing Modified CANDLE Burnup with Radial Direction Shuffling Scheme has been performed with the power level 325–525 MWt. In this study Modified CANDLE burn-up scheme with radial direction shuffling has been employed with special attention to minimize reactivity swing during burn-up. The reactor cores are divided into 10 regions with equal volume in radial direction. The shuffling scheme of Modified CANDLE in radial direction can be described as follows. The natural uranium input is initially loaded in region 1. After 10 years of burnup the fuel in region 1 is shifter to region 2, the fuel in region 2 is shifted to region 3, etc. till the fuel of region 9 is shifter to region 10. The fuel from region 10 is taken out. Region 1–5 basically breeding zones in which plutonium is accumulated in fuels, while regions 5–10 have enough accumulated plutonium so that they contribute significantly to the power production. We call region 5–10 as burning zone. Nitride fuel is adopted as fuel in this study. Some parametric studies have been performed including variation of core height and power level. The neutronic calculations have been performed using the SRAC 2006 code with JENDL 4.0 nuclear data library. The optimized result shows the reactor could be operated 10 years continuously with maximum excess reactivity less than 1 % Δk/k for 500 MWt output power, 160 cm core active height and 110 cm core active radius.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"7 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84621370","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

Comparative analysis of fuel burnup calculations of fourth-generation European fast reactors 第四代欧洲快堆燃料燃耗计算的对比分析

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2023-08-14 DOI: 10.1515/kern-2023-0019

Amr Ibrahim

{"title":"Comparative analysis of fuel burnup calculations of fourth-generation European fast reactors","authors":"Amr Ibrahim","doi":"10.1515/kern-2023-0019","DOIUrl":"https://doi.org/10.1515/kern-2023-0019","url":null,"abstract":"Abstract The sustainability of nuclear energy implies the continuous research and development of fast reactor technology. This work represents a comparative analysis of fuel burnup calculations of three commercial-level fast spectrum concepts which are under research and development in Europe. The investigated designs are the European Sodium-cooled Fast Reactor, the European Lead-cooled Fast Reactor, and the European Gas-cooled Fast Reactor. MCNPX transport code was used to design three representative fuel assemblies of these fourth-generation concepts to analyze and compare their neutronic and safety parameters. The neutronic and safety analysis in this work includes the evolution of infinite multiplication factor and fissile inventory, neutron yield, the average energy of neutrons causing fission, neutron energy spectrum, neutron generation time, Doppler reactivity effect, effective delayed neutron fraction, and coolant void reactivity coefficient. The fuel burnup results showed that the ESFR is superior regarding the reactivity swing and breeding of fissile 239Pu. On the other hand, analysis of safety parameters results showed that they depend mainly on fuel composition rather than on other design specifications.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"6 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80206043","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

Study on the regularity of Se(IV) adsorption by bentonite from different regions 不同地区膨润土对Se(IV)的吸附规律研究

IF 0.5 4区工程技术

Kerntechnik Pub Date : 2023-08-02 DOI: 10.1515/kern-2023-0025

Qifeng Jiang, Weigang Liu, Yuxin Liao, Haonan Li, Junhan Li, Jiahui Feng, Zimin Zhang, Yuzhen Sun, Yuxin Chen, Jiachen Guo, X. Su, R. Hua

{"title":"Study on the regularity of Se(IV) adsorption by bentonite from different regions","authors":"Qifeng Jiang, Weigang Liu, Yuxin Liao, Haonan Li, Junhan Li, Jiahui Feng, Zimin Zhang, Yuzhen Sun, Yuxin Chen, Jiachen Guo, X. Su, R. Hua","doi":"10.1515/kern-2023-0025","DOIUrl":"https://doi.org/10.1515/kern-2023-0025","url":null,"abstract":"Abstract Bentonite exhibits obvious geological characteristics in different areas, and its chemical composition varies. To investigate the impact of these variations on the adsorption of Se(IV), the chemical structures and elemental contents of three types of bentonites were characterized using FTIR and XR. By conducting a series of experiments and fitting the results with the kinetic adsorption model and the isothermal adsorption model, it was discovered that bentonite exhibits diverse adsorption modes for Se(IV). In acidic environments, the adsorption mode primarily involves forming an outer-sphere complex, whereas in neutral and alkaline environments, the primary mode is to form an inner-sphere complex. Zhi-Shin bentonite, which has low alumina content and high iron oxide content, demonstrates poor adsorption effectiveness on Se(IV) at low temperatures (less than 45 °C), but exhibits good adsorption effectiveness at high temperatures (more than 50 °C). Conversely, bentonite with high alumina content and low iron oxide content demonstrates the opposite effect. Furthermore, for bentonite with high iron oxide content, Se(IV) will form more inner-sphere complexes with iron oxide, and the adsorption behavior is not easily affected by changes in ionic strength and pH.","PeriodicalId":17787,"journal":{"name":"Kerntechnik","volume":"24 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75805483","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}

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Frontmatter 头版头条

4区工程技术

Kerntechnik Pub Date : 2023-08-01 DOI: 10.1515/kern-2023-frontmatter4

引用次数: 0