Search results for "IMPIANTI"

Recent progress in developing a feasible and integrated conceptual design of the WCLL BB in EUROfusion project

2019

The water-cooled lithium-lead breeding blanket is in the pre-conceptual design phase. It is a candidate option for European DEMO nuclear fusion reactor. This breeding blanket concept relies on the liquid lithium-lead as breeder-multiplier, pressurized water as coolant and EUROFER as structural material. Current design is based on DEMO 2017 specifications. Two separate water systems are in charge of cooling the first wall and the breeding zone: thermo-dynamic cycle is 295–328 °C at 15.5 MPa. The breeder enters and exits from the breeding zone at 330 °C. Cornerstones of the design are the single module segment approach and the water manifold between the breeding blanket box and the back suppo…

On the hyperporous non-linear elasticity model for fusion-relevant pebble beds

2010

Abstract Packed pebble beds are particular granular systems composed of a large amount of small particles, arranged in irregular lattices and surrounded by a gas filling interstitial spaces. Due to their heterogeneous structure, pebble beds have non-linear and strongly coupled thermal and mechanical behaviours whose constitutive models seem limited, being not suitable for fusion-relevant design-oriented applications. Within the framework of the modelling activities promoted for the lithiated ceramics and beryllium pebble beds foreseen in the Helium-Cooled Pebble Bed breeding blanket concept of DEMO, at the Department of Nuclear Engineering of the University of Palermo (DIN) a thermo-mechani…

Definizione della metodologia e degli input necessari per l’esecuzione di analisi integrate CALMET-CALPUFF ai fini della valutazione della dispersion…

2015

Il presente documento riporta l’attività condotta durante l’ultima annualità dell’AdP ENEAMSE, linea progettuale LP1: “Sviluppo competenze scientifiche nel campo della sicurezza nucleare”, Task B2.3 “Definizione della metodologia e degli inputs necessari per l’esecuzione di analisi integrate Calmet-Calpuff ai fini della valutazione della dispersione di inquinanti radioattivi in atmosfera”. La linea di ricerca si inserisce nell’ambito degli studi condotti dall’ENEA a supporto delle attività di pre-emergenza a seguito di situazioni incidentali in uno degli impianti nucleari dislocati nei Paesi frontalieri dell'Italia.

On the Simulation of Solid Particle Distribution in Multiple Impeller Agitated Tanks via Computational Fluid Dynamics

1998

Designing supplier selection strategies under COVID-19 constraints for industrial environments

2021

COVID-19 has been impacting worldwide supply chains causing interruption, closure of production and distribution. This impact has been drastic on the supplier side and, as a consequence of disruptions, strong reductions of production have been estimated. Such a circumstance forces companies to propose innovative best practices of supply chain risk management aimed at facing vulnerability generated by COVID-19 and pursuing industrial improvements in manufacturing and production environments. As a part of supply chain strategy, supplier selection criteria should be revised to include pandemic-related risks. This article aims to propose an answer to such a problem. In detail, a comprehensive t…

Vertical standing copper nanowires for electrochemical sensor of nitrate in water

2020

Nitrogen, in the forms of nitrate (NO3-), nitrite, or ammonium, is a nutrient needed for plant growth and it is a common constituent of fertilizers [1]. When fertilizers are overused, they contaminate the ground water and then the food chain. For humans, a low level of nitrate is advisable because it increases the blood flow and has a good effect on both blood pressure and cardiovascular system. On the contrary, a high concentration of nitrate can be dangerous for humans. Nitrate ions undergoes different chemical transformations (i.e. to nitrite ions by Escherichia coli) producing different nitrogen-based compound such as nitrite ions, nitric oxide and ammonia [2]. These chemicals lead to s…

Ajuste y calibración, con la llegada de nuevos datos, de un modelo epidemiológico simple

2020

Los denominados sistemas dinámicos están presentes en cualquier ámbito evolutivo. Modelos matemáticos adecuados (físicos, sociales, económicos, biológicos, etc.) constituyen un laboratorio `in vitro' de tales sistemas, que permiten su estudio, simulación y conocimiento. Tales modelos dependen de determinados parámetros que caracterizan el modelo. Partiendo de condiciones iniciales dadas, permiten estimar la evolución del sistema y facilitan así la toma de decisiones. Para que la precisión de un modelo sea aceptable, los resultados que produce son comparados con datos provenientes de una monitorización adecuada, tan en tiempo real como sea posible, del sistema. Con los datos monitorizados, e…

Modelling the Reverse ElectroDialysis process with seawater and concentrated brines

2012

Technologies for the exploitation of renewable energies have been dramatically increasing in number, complexity and type of source adopted. Among the others, the use of saline gradient power is one of the latest emerging possibilities, related to the use of the osmotic/chemical potential energy of concentrated saline solutions. Nowadays, the fate of this renewable energy source is intrinsically linked to the development of the pressure retarded osmosis and reverse electrodialysis technologies. In the latter, the different concentrations of two saline solutions is used as a driving force for the direct production of electricity within a stack very similar to the conventional electrodialysis …

On the measurement of bubble size distribution in gas–liquid contactors via light sheet and image analysis

2010

Abstract Particle image velocimetry techniques coupled with advanced image processing tools are receiving an increasing interest for measuring flow quantities and local bubble-size distributions in gas–liquid mechanically agitated vessels. When trying to analyze image information the problem arises that bubble sizes are generally underestimated, due to the fact that the laser sheet used for lighting the system randomly cuts bubbles over non-diametrical planes, leading to an apparent bubble size distribution even in the ideal case of single sized bubbles. Clearly in the case of bubbles with a size distribution the experimental information obtained is affected by the superposition of effects.…

Experimental and fluid dynamic study of continuous supercritical water gasification of glucose

2016

Abstract The supercritical water gasification (SCWG) of glucose as a model compound for H 2 production is studied in term of process development at 25 MPa and 650 °C. Gasification has been investigated using a laboratory scale continuous plant comprising a continuous down flow reactor with a volume of 200 cm 3 , a heat recovery section and pre-heat of the biomass to simulate more closely an industrial design. Feed streams (pure water and glucose solution) are introduced at the top of the vessel and products are extracted from the bottom. The reactor is equipped with various inlet points that allow to modify the inlet position of reacting streams in order to study the effect of stream mixing…