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检索条件"丛书名=Lecture Notes in Mechanical Engineering"

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Evaluation of Convective Heat Transfer Inside the Pores of Pyrolyzed Wood using a μ-CT Based Realistic Geometry 14th

Evaluation of Convective Heat Transfer Inside the Pores of P...

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14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： Dernbecher, Andrea Bhaskaran, Supriya Vorhauer-Huget, Nicole Seidenbecher, Jakob Gopalkrishna, Suresh Briest, Lucas Dieguez-Alonso, Alba TU Dortmund Univ Lab Transport Proc Emil Figge Str 68 D-44227 Dortmund Germany Otto von Guericke Univ Inst Proc Engn IVT Univ Pl 2 D-39106 Magdeburg Germany Otto von Guericke Univ Inst Fluid Dynam & Thermodynam ISUT Univ Pl 2 D-39106 Magdeburg Germany

ISBN: (纸本)9783031666087;9783031666094

This work investigates the impact of the realistic porous structure of a biomass particle on the intraparticle convective transport. To this end, the porous structure of a biomass particle pyrolyzed at 300 degrees C was characterized with X-ray microtomography and a realistic reconstruction of the microstructure was used for pore-resolved computational fluid dynamics (CFD) simulations of the flow. Based on these simulation results, local interfacial heat transfer coefficients in the pores were evaluated. This is a first step to derive macroscopic effective parameters that describe the intraparticle transport taking into account the complex anisotropic microstructure and morphology of the particle, as well as its evolution during the pyrolytic conversion process.

关键词： Biomass Pyrolysis Pore-resolved simulation X-ray microtomography Computational fluid dynamics

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Sustainable Energy Transition: Role of Nuclear Power

Sustainable Energy Transition: Role of Nuclear Power

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Saudi International Conference on Nuclear Power engineering (SCOPE)

作者： Asif, Muhammad Pandey, Asha Adulugba, Charles King Fand Univ Petr & Minerals Dhahran Saudi Arabia Guatam Buddha Univ Noida India Natl Gas Transmiss Warwick England

ISBN: (纸本)9783031643613;9783031643620

The global energy landscape in the twenty-first century is undergoing a significant shift with regard to the availability and use of energy resources. The energy transition is a response to the problems that the world's energy landscape is facing, chief among them being climate change. Other issues include fast-increasing demand, dwindling fossil fuel sources, skyrocketing energy prices, and hazards related to supply security. Nuclear energy is a vital source of energy that contributes significantly to the global electrical mix, particularly in developed nations. Nuclear power has a number of benefits, one of which is that it produces fewer carbon emissions than fossil fuels. This paper investigates the potential of nuclear power in the energy transition, taking into account the technology's phase-out trend that some developed countries have experienced over the past few decades, as well as the increased attention it has recently received as a low-carbon energy solution to combat climate change. Along with this, it looks at the role that nuclear power has in the energy transition using multi-criteria decision analysis (MCDA), which is based on the opinions of experts in both industrialized and developing nations.

关键词： Energy sustainability greenhouse gas emissions climate change renewable energy multi-criteria decision analysis

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Entropy Generation Due to Double-Diffusive Natural Convection in Partly Porous Cavity Under Local Thermal Non-equilibrium State and Non-uniform Heating and Salting 14th

Entropy Generation Due to Double-Diffusive Natural Convectio...

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14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： Omara, A. Bourouis, A. Bouchair, R. Univ Mentouri Constantine 1 Constantine 25000 Algeria Univ Mohammed Seddik Benyahia Dept Mech Engn Jijel 18000 Algeria

ISBN: (纸本)9783031666087;9783031666094

In this work, we conducted a numerical analysis to examine entropy generation within a cavity consisting of two distinct layers: a porous layer and a clear binary fluid layer, adopting the local thermal non-equilibrium model between the solid of the porous layer and the saturating binary fluid. The governing dimensionless coupled partial differential equations, which include the two energy equations for fluid and solid phases, the momentum equations, and the entropy generations equations, are discretized using the finite volume method. The effects of several key parameters on internal irreversibility due to heat transfer in the solid and fluid phases are investigated. These parameters include the buoyancy ratio (N), dimensionless porous layer thickness (Delta), dimensionless inter-phase heat transfer coefficient (H), modified thermal conductivity ratio (gamma), and the porosity of the porous layer (epsilon). It is found that, in addition to the effect of the physical properties, H and gamma, on the thermal equilibrium between the porous layer and the saturating binary fluid, the geometrical properties, Delta and epsilon, play a dominant role in the choice of the appropriate physical model (LTE or LTNE) when studying heat transfer in a porous medium.

关键词： Entropy Generation LTNE Model Partially Porous Cavity Double-Diffusive Natural Convection Non-uniform Heating and Salting

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Modeling of Filtration Processes with Arbitrary Shaped Particles Using an Immersed-Boundary-Method (IBM) 14th

Modeling of Filtration Processes with Arbitrary Shaped Parti...

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14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： Braschke, Kamil Zargaran, Amin Freese, Florian Buerger, Markus Burgmann, Sebastian Janoske, Uwe Univ Wuppertal Sch Mech & Safety Engn Gausstr 20 D-42119 Wuppertal Germany

ISBN: (纸本)9783031666087;9783031666094

Filtration processes are a complex combination of deposition and rearrangement of particles and agglomerates of particles on fibres. The small scales of particles and fibres lead to a lot of difficulties in the experimental analysis of filtration processes. On the other hand, numerical methods are mostly bases on a Lagrangian modelling, i. e. treating the particles as a point of mass neglecting its shape. This requires the use of analytical or empirical correlations for drag and adhesion forces which are often only available for spherical particles. Especially in configurations of particle-particle and particle-wall interactions these correlations may lead to deviations. If non-spherical particles should be considered, the Lagrangian method cannot be applied. In this work, the geometry of the particle is volumetrically resolved and is taken into account in the computational grid for the flow calculation. This is achieved by using an Immersed Boundary Method implemented in the open source CFD code OpenFOAM((R)). The method is characterized by a determination of the particle forces through an integration of the viscous and pressure forces acting on the surface as well as the adhesion forces over the particle surface between different parts (particles, walls). Besides the detailed presentation of the model and its implementation in OpenFOAM((R)), different application areas of the model are presented.

关键词： CFD Immersed Boundary Method Lagrangian Filtration

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An Efficient Approach for Benchmarking Axial Flow-Induced Vibration for Nuclear Applications

An Efficient Approach for Benchmarking Axial Flow-Induced Vi...

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Saudi International Conference on Nuclear Power engineering (SCOPE)

作者： Pauzi, Anas Muhamad Iacovides, Hector Cioncolini, Andrea Univ Manchester Dept Mech Aerosp & Civil Engn Manchester Lancs England Guangdong Technion Israel Inst Technol GTIIT Shantou Guangdong Peoples R China

ISBN: (纸本)9783031643613;9783031643620

Fretting wear at the spacer grid in fuel assemblies, due to flow-induced vibration (FIV), is one of the main causes of fuel failures in Light Water Reactors (LWRs). Therefore, accurately predicting FIV is crucial for mitigating this issue, and a computationally efficient simulation method is necessary. In this regard, the Unsteady Reynolds-Averaged Navier-Stokes (URANS) approach is applied as a promising and efficient simulation method for FIV prediction. While previous studies have primarily relied on Large Eddy Simulation (LES) for the fluid domain, URANS provides an attractive alternative due to its lower computational demands, especially for strong 2-way Fluid-Structure Interaction (FSI) coupling. This paper aims to explore efficient approaches for benchmarking axial FIV for nuclear applications by examining the self-exciting axial FIV over a cantilevered rod and comparing it with experimental measurements at the University of Manchester (UoM) using different URANS models and divergence schemes for the convection term in the fluid momentum equations. In both variations of the URANS model closure, the eddy viscosity model (EVM) k-omega SST model and the Reynolds Stresses Model (RSM) Launder, Reece, and Rodi (LRR) model, accurately predicted the mean RMS amplitude and frequency of vibration.

关键词： Flow-Induced Vibration (FIV) Fluid-Structure Interaction (FSI) Nuclear Fuel

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Prediction of Ground Vibration Induced by a High-Speed Train Moving Along a Track Supported by a Pile-Plank Structure 14th

Prediction of Ground Vibration Induced by a High-Speed Train...

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14th International Workshop on Railway Noise (IWRN)

作者： Peng, Yuhao Lu, Jianfei Sheng, Xiaozhen Southwest Jiaotong Univ State Key Lab Rail Transit Vehicle Syst Chengdu Sichuan Peoples R China Jiangsu Univ Dept Civil Engn Zhenjiang Jiangsu Peoples R China Shanghai Univ Engn Sci Sch Urban Railway Transportat Shanghai Peoples R China

ISBN: (纸本)9789819978519;9789819978526

Piles are commonly applied to the construction of high-speed railways at grade for many purposes including controlling train-induced ground vibration. The piles are inserted into the ground periodically in the track direction, making the track/pile/ground system very complicated. The most frequently used method to analyze this kind of structure is to establish a three-dimensional finite element model at a very high computational cost. Based on the fictitious pile method, this paper develops a semi-analytical model, in which the track/pile/ground system is divided into a 2.5D track/ground system and a system of an infinite number of periodically arranged fictitious piles, to investigate the effect of the pile-plank structure on ground vibration. The two systems become equivalent to the original track/pile/ground system when they are coupled using the displacement continuity condition. Making use of the periodicity of the track/pile/ground system, the model works in the Floquet wavenumber domain and only a single cell of the periodic structure is required to analyze. The results show that the pile-plank structure reduces as well as increases, depending on frequency, train-induced ground vibration.

关键词： Ground vibration Pile-plank structure Fictitious pile method Moving load

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A Meta-analysis Regression on Efficient and Productivity Energy Research 32nd

A Meta-analysis Regression on Efficient and Productivity Ene...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Sequeira, Olinda Teixeira, Fernando Inst Politecn Tomar Tomar Portugal Ci2 Smart Cities Res Ctr Tomar Portugal Inst Politecn Beja Beja Portugal

ISBN: (纸本)9783031381645;9783031381652

This paper presents a meta-analysis regression of efficiency and productivity papers on energy. The objective is to know if there are differences in the value of technical efficiency (TE) by applying different estimation methods. In the energy sector, over the recent decades, many studies have been published that analyse firms' performance, using as a measure of technical efficiency the estimated values from parametric and non-parametric methods. In the literature there is no study that addresses whether different estimation methods can influence the value obtained for TE. The analysis of these factors is an important instrument for performance evaluation, by enabling firms to adopt more precise lines and benchmarking techniques. The data consist of 162 models, reporting on 63 scientific articles which empirically analyze the level of efficiency and productivity in the energy sector, from 1979 to 2013. The meta-regression model enables an understanding of the effects that different specifications of the models may have on the estimated values for efficiency. The results identify positive and negative effects on efficiency, but the most important is that neither method is preferable to the other.

关键词： Meta-Analysis Stochastic Frontiers Data Envelopment Analysis

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Corrosion Surface Morphology of 13Cr Steel in the Boiler Water Containing Chloride Ions and Formic Acid 3rd

Corrosion Surface Morphology of 13Cr Steel in the Boiler Wat...

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3rd International Conference on Advanced Surface Enhancement (INCASE)

作者： Niu, Li-Bin Kubota, Hayato Shinshu Univ Fac Engn Wakasato 4-17-1 Nagano 3808553 Japan Shinshu Univ Nagano 3808553 Japan

ISBN: (纸本)9789819986422;9789819986439

Electrochemical corrosion tests were conducted on 13Cr steel for steam turbine blade material of power plants in the simulated boiler water containing chloride ions (Cl-) and formic acid (HCOOH). The corroded surfaces were observed and analyzed in detail. In the boiler waters containing 100 ppm Cl-, the formation of corrosion products as passivation films on the specimen surfaces inhibited the occurrence of pitting corrosion by the additions of 25-75 ppm HCOOH.

关键词： 13Cr steel Corrosion Pitting corrosion Passivation film Boiler water Formic acid

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Subjective-Objective Assessment of Different Torque Vectoring Control Strategies 16th

Subjective-Objective Assessment of Different Torque Vectorin...

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16th International Symposium on Advanced Vehicle Control

作者： Asper, Michele Vignati, Michele Sabbioni, Edoardo Politecn Milan Dept Mech Engn Via La Masa 1 I-20156 Milan Italy

ISBN: (纸本)9783031703942;9783031703928;9783031703911

With the increasing demand for enhanced vehicle performance and handling dynamics, torque vectoring has become a key technology in contemporary automotive engineering. Over the years, various control algorithms have been developed and their performance assessed using objective metrics that measure a vehicle's ability to follow a reference quantity for lateral dynamics. However, this evaluation approach is limited as it does not consider feedback from actual drivers. This paper addresses this critical gap by incorporating drivers' subjective evaluations through Driver-in-the-Loop simulations. The study conducts a comprehensive analysis of both objective metrics and subjective driver assessments, investigating the impact of different torque vectoring control strategies on vehicle dynamics. By correlating quantitative metrics with human perception, this integrated approach enhances the understanding of the effectiveness of torque vectoring control strategies and their real-world implications for driver satisfaction.

关键词： Torque Vectoring Vehicle Dynamics Driver-in-the-Loop Simulation Subjective Evaluation Objective Assessment

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Ball Burnishing Parameters Affecting the Residual Stress of the Zr65Cu15Al10Ni10 Metallic Glass 10th

Ball Burnishing Parameters Affecting the Residual Stress of ...

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10th International Conference on Design and Modeling of mechanical Systems (CMSM)

作者： Bouzayeni, Sami Gharbi, Fathi Benameur, Tarek Al-Fadhalah, Khaled J. Univ Monastir LR99ES32 ENIM Mech Engn Lab Monastir Tunisia Univ Kairouan ISSATKR Inst Super Sci Appl & Technol Kairouan Kairouan Tunisia Kuwait Univ Coll Engn & Petr Mech Engn Dept Safat 5969 Kuwait

ISBN: (纸本)9783031650062;9783031650079

Ball burnishing (BB) is a superfinish operation performed to improve surface, subsurface quality and mechanical proprieties. In the present study, a bi-dimensional (2D) finite element model (FEM) was developed to confirm that the BB of Zr65Cu15Al10Ni10 bulk metallic glass (BMG) affects its microstructures, roughness, and residual stress. As a part of the process, the influence of different parameters on the residual stress surface in the axial and transverse directions was investigated. The topography of the burnished samples is analyzed by an atomic force microscope (AFM) and scanning electron microscope (SEM). The ball burnishing process was performed, and the improvements in the surface and subsurface integrity were found to be significant. Residual stress after BB was found to be affected by burnishing force to a statistically significant extent. The Zrbased BMGdisplayed significant improvements in surface roughness and residual stress following the burnishing process. The topographical and morphological results of the treated samples show a variation of irregularity of the burnished faces and the formation of the shear bands (SBs) below the hardened layer. The FE simulation results indicate that the residual stress values and depth are increased by the increase of burnishing force. The ball burnishing process enhanced the surface topography and produce the residual stress on the Zr-BMG samples.

关键词： Bulk Metallic Glass Ball Burnishing Residual stress Surface topography Finite Element Modeling

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