Search results for " impianti"

showing 10 items of 778 documents

Linear stability analysis of gas-fluidized beds for the prediction of incipient bubbling conditions

2010

Abstract This work focuses on the development of a novel linear stability criterion for the state of homogeneous fluidization regime, based on a new mathematical model for gas-fluidized beds. The model is developed starting from the well-known particle bed model. A mono-dimensional momentum balance is derived leading to a set of equations which explicitly include voidage-gradient dependent terms (elastic force) for both solid and fluid phases. A fully predictive criterion for the stability of homogeneous fluidization state is here proposed, based on the well-known Wallis’ linear stability analysis. The criterion requires the choice of an appropriate averaging distance, which in the present …

Stability criterionSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciWork (thermodynamics)Gas fluidization Stability criterion Mathematical modellingSettore ING-IND/25 - Impianti ChimiciGeneral Chemical EngineeringGeneral ChemistryState (functional analysis)MechanicsStability (probability)Industrial and Manufacturing EngineeringMATHEMATICAL MODELLINGClosure (computer programming)Control theoryEnvironmental ChemistryParticleSensitivity (control systems)FluidizationGas fluidizationMathematicsLinear stabilityChemical Engineering Journal
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Analysis of a Generation 3+ Pressurised Water Reactor plant response to a postulated Station Black Out

2013

Station Black-out fission reactorsSettore ING-IND/19 - Impianti Nucleari
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On the optimization of the first wall of the DEMO water-cooled lithium lead outboard breeding blanket equatorial module

2016

Abstract Within the framework of EUROfusion R&D activities a research campaign has been carried out at the University of Palermo in order to investigate the thermo-mechanical performances of the DEMO water-cooled lithium lead (WCLL) breeding blanket first wall (FW). The research campaign has been mainly focused on the optimization of the FW geometric configuration in order to maximize the heat flux it may safely withstand fulfilling all the thermal, hydraulic and mechanical requirements foreseen by safety codes. Attention has been focused on the FW flat concept endowed with square cooling channels and the potential influence of its four main geometrical parameters on its thermo-mechanical p…

Steady stateComputer scienceMechanical EngineeringNuclear engineeringchemistry.chemical_elementBlanket01 natural sciences7. Clean energyFinite element methodSquare (algebra)010305 fluids & plasmasDEMO reactor WCLL blanket First wallNuclear Energy and EngineeringHeat fluxchemistry0103 physical sciencesThermalGeneral Materials ScienceLithium010306 general physicsLead (electronics)Settore ING-IND/19 - Impianti NucleariCivil and Structural Engineering
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Analysis of the thermomechanical behavior of the IFMIF bayonet target assembly under design loading scenarios

2015

In the framework of the IFMIF Engineering Validation and Engineering Design Activities (IFMIF/EVEDA) phase, ENEA is responsible for the design of the European concept of the IFMIF lithium target system which foresees the possibility to periodically replace only the most irradiated and thus critical component (i.e., the backplate) while continuing to operate the rest of the target for a longer period (the so-called bayonet backplate concept). In this work, the results of the steady state thermomechanical analysis of the IFMIF bayonet target assembly under two different design loading scenarios (a "hot" scenario and a "cold" scenario) are briefly reported highlighting the relevant indications…

Steady stateEngineering designComputer scienceMechanical EngineeringNuclear engineeringStructural integrityIFMIF Target assembly Bayonet backplate Engineering design ThermomechanicsThermomechanicStress (mechanics)ThermomechanicsHigh fluxNuclear Energy and EngineeringLinearizationTarget assemblyComponent (UML)Thermomechanics;Bayonet backplate;Engineering design;Target assembly;IFMIFIFMIFGeneral Materials ScienceEngineering design processBayonet backplateMiddle planeSettore ING-IND/19 - Impianti NucleariCivil and Structural EngineeringFusion Engineering and Design
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On the thermomechanical behavior of the European target assembly design of IFMIF-EVEDA lithium test loop under start-up transient scenarios

2013

Uncoupled thermomechanical transient analyses have been carried out to investigate the behavior of IFMIF-EVEDA lithium test loop bayonet backplate target assembly under two selected start-up transient operational scenarios. The first transient scenario considered foresees that the target assembly, starting from the initial uniform temperature of 50 C, is heated up uniquely by convective heat transfer with lithium, flowing from inlet to outlet nozzle at its reference nominal temperature and pressure, until its nominal steady state thermal field distribution is reached. The second transient scenario foresees, more realistically, that the target assembly, starting from the uniform temperature …

Steady stateMaterials scienceConvective heat transferMechanical EngineeringNozzleFlow (psychology)chemistry.chemical_elementMechanicsThermomechanicsIFMIF-EVEDA lithium test loop Target assembly Thermomechanics Start-up transientTarget assembly;Start-up transient;IFMIF-EVEDA lithium test loop;ThermomechanicsNuclear Energy and EngineeringHeat fluxchemistryIFMIF-EVEDA lithium test loopTarget assemblyThermalStart-up transientGeneral Materials ScienceLithiumTransient (oscillation)Settore ING-IND/19 - Impianti NucleariCivil and Structural Engineering
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Study of the thermo-mechanical performances of the IFMIF-EVEDA Lithium Test Loop target assembly

2012

Abstract Within the framework of the IFMIF R&D program and in close cooperation with ENEA-Brasimone, at the Department of Energy of the University of Palermo a research campaign has been launched to investigate the thermo-mechanical behavior of the target assembly under both steady state and start-up transient conditions. A theoretical approach based on the finite element method (FEM) has been followed and a well-known commercial code has been adopted. A realistic 3D FEM model of the target assembly has been set-up and optimized by running a mesh independency analysis. A proper set of loads and boundary conditions, mainly concerned with radiation heat transfer between the target assembly ex…

Steady stateMaterials scienceIFMIF Target assembly Thermo-mechanicsMechanical EngineeringNuclear engineeringLithium testFinite element methodLoop (topology)Hydrostatic testNuclear Energy and EngineeringHeat transferGeneral Materials ScienceTransient (oscillation)Boundary value problemSettore ING-IND/19 - Impianti NucleariCivil and Structural EngineeringFusion Engineering and Design
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Optimization of the breeder zone cooling tubes of the DEMO Water-Cooled Lithium Lead breeding blanket

2016

Abstract The determination of an optimal configuration for the breeder zone (BZ) cooling tubes is one of the most important issues in the DEMO Water-Cooled Lithium Lead (WCLL) breeding blanket R&D activities, since BZ cooling tubes spatial distribution should ensure an efficient heat power removal from the breeder, avoiding hotspots occurrence in the thermal field. Within the framework of R&D activities supported by the HORIZON 2020 EUROfusion Consortium action on the DEMO WCLL breeding blanket design, a campaign of parametric analyses has been launched at the Department of Energy, Information Engineering and Mathematical Models of the University of Palermo (DEIM), in close cooperation with…

Steady stateMathematical modelDEMO reactor WCLL breeding blanket Breeder zone cooling tubesMechanical EngineeringNuclear engineeringchemistry.chemical_elementBlanket7. Clean energy01 natural sciencesFinite element method010305 fluids & plasmasBreeder (animal)Nuclear Energy and Engineeringchemistry0103 physical sciencesThermalEnvironmental scienceGeneral Materials ScienceLithium010306 general physicsSettore ING-IND/19 - Impianti NucleariCivil and Structural EngineeringParametric statisticsFusion Engineering and Design
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A Multi objective inventory model for short food supply chains

2017

Over the past 50 years, vertically integrated multinationals dominated global food markets by providing huge product diversity at low prices. Such systems are characterized by long supply chains capable of achieving high cost efficiencies resulting from the use of cheap raw materials, high chemical inputs, industrial shelf-life extension processes, economies of scale and mechanization. This dominant position on the market, however, has been achieved at a heavy cost on the global environment, generated by massive food wastage, and by a steady supply of fossil fuels. For such reasons, global supply chains are considered unsustainable and new food systems are being promoted in order to replace…

Strategy and Management1409 Tourism Leisure and Hospitality ManagementOrganizational Behavior and Human Resource ManagementShelf-lifeManagement of Technology and InnovationSupply ChainSettore ING-IND/17 - Impianti Industriali MeccaniciBusiness and International ManagementManagement Science and Operations ResearchSafety Risk Reliability and QualityWaste Management and DisposalIndustrial and Manufacturing EngineeringMulti Objective
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Numerical assessment of the thermomechanical behaviour of the DEMO Water-Cooled Lithium Lead inboard blanket equatorial module

2018

Abstract Within the framework of EUROfusion R&D activity, a research campaign has been carried out at the University of Palermo, in close cooperation with ENEA labs, in order to assess the thermo-mechanical performances of the DEMO Water-Cooled Lithium Lead (WCLL) inboard blanket equatorial module, whether properly integrated within its whole inboard segment. In particular, a detailed 3D model of this segment, including all the other modules, the back-supporting structure and the attachment system, has been considered in order to realistically simulate the boundary conditions affecting the equatorial module behaviour. The study has been focused on the investigation of the module thermo-mech…

Structural materialComputer scienceMechanical EngineeringNuclear engineeringThermo-mechanicBlanket01 natural sciencesFinite element method010305 fluids & plasmasStress (mechanics)WCLL blanketNuclear Energy and EngineeringCabin pressurizationLinearization0103 physical sciencesGeneral Materials ScienceMaterials Science (all)Boundary value problem010306 general physicsDEMOFEM analysiLoss-of-coolant accidentSettore ING-IND/19 - Impianti NucleariCivil and Structural EngineeringFusion Engineering and Design
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Neutronic and photonic analysis of the water-cooled Pb17Li test blanket module for ITER-FEAT

2002

Abstract Within the European Fusion Technology Program, the Water-Cooled Lithium Lead (WCLL) DEMO breeding blanket line was selected in 1995 as one of the two EU lines to be developed in the next decade, in particular with the aim of manufacturing a Test Blanket Module (TBM) to be implemented in ITER. This specific goal has been maintained also in ITER-FEAT program even if the general design parameters of the TBMs have reported some changes. This paper is focused on the investigation of the WCLL-TBM nuclear response in ITER-FEAT through detailed 3D-Monte Carlo neutronic and photonic analyses. A 3D heterogeneous model of the most recent design of the WCLL-TBM has been set-up simulating reali…

Structural materialMaterials sciencebusiness.industryNeutronicMechanical EngineeringWater cooledPower depositionNuclear engineeringPhotonicchemistry.chemical_elementFusion powerBlanketMonte Carlo methodNuclear physicsNuclear Energy and EngineeringchemistryNeutron sourceGeneral Materials ScienceLithiumBreeding blanketPhotonicsbusinessSettore ING-IND/19 - Impianti NucleariCivil and Structural EngineeringFusion Engineering and Design
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