Дисертації з теми "Fisica dei fluidi"
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Bacilieri, Nicolò. "Meccanica e termodinamica dei continui con applicazioni." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16070/.
Повний текст джерелаLusoli, Stefano. "Dinamica dei fluidi: aspetti matematici e analisi di vorticità." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21195/.
Повний текст джерелаMetallo, Antonio. "Analisi sperimentale delle prestazioni energetiche dei fluidi frigoriferi tipo “HFO” candidati alla sostituzione dell’R134a." Doctoral thesis, Universita degli studi di Salerno, 2016. http://hdl.handle.net/10556/2218.
Повний текст джерелаThe present experimental work was born from the need to expand the knowledge on the new type of refrigerant fluids, the HFO, representing the fourth generation of fluorinated refrigerants, born in response to the directives before the Kyoto Protocol and subsequently with the entry into force of the new Regulation in the European field (F-gas Regulation) requiring the reduction of greenhouse gases, including HFCs are also included. The on HFO-based technology offers interesting promises as regards energy efficiency and environmental impact. The primary characteristic of the HFO is the global warming potential (GWP) extremely low. In spite of other fluids, comparable yields of 'R134a are obtainable without significant modifications of' hardware plant, as some of the main thermodynamic properties (boiling point, critical point, the vapor density of the liquid and density) of HFO are very similar to those of R134a. In fact, the knowledge of the chemical-physical properties of a fluid refrigerant is of fundamental importance to be able to properly size the mechanical components used in the reverse cycle of the vapor compression. This allows you to assess whether or not to introduce new fluids on existing plants, and how they might be amended if necessary to make the drop-in. For both fluids and even after the two mixtures were made tests according to UNI ISO 15502 using an experimental system a refrigerating machine samsung RT 59QBPN, energy class A + two compartments, one from 342 liters for fresh food, and that for frozen from 131 l. Three types of tests are identified: pull-down, the endurance tests twenty-four hours at -18 ° C and -26 ° C. At first we have to check the performance of the 'system with R134a .All data were acquired using LabView and analyzed using a MatLab program. Once extracted the main thermodynamic properties of the cycle and performances relating to 'R134a, it was made the drop-in with the then R1234ze with R1234yf, and finally were tested mixtures. Though . performance of 'R1234yf are very similar to those of R134a performance parameters of' HFO1234ze slightly exceed those the traditional R134a, also diminish both the TEWI that 'LCCP, which is why you might think as a valid candidate for a next use in domestic refrigeration systems. Even better the performance following the drop-in first goes to a R134a HFOyf-mixture and subsequently with the R134a-HFOze. In summary, they have obtained for the first mixture a decrease in consumption (≈16%) of TEWI (≈16.5%) and LCCP (≈16%). It remains to evaluate the performance in other types of applications. [edited by author]
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Nicoletti, Andrea. "Meccanica e termodinamica dei mezzi continui con applicazioni." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16945/.
Повний текст джерелаGuidetti, Mattia. "Ricostruzione di flussi veicolari su scala regionale: analisi dei dati disponibili." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5957/.
Повний текст джерелаFeliziani, Annalisa. "Modellistica dei tubi di lava." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Знайти повний текст джерелаBrunetti, Alessio Francesco. "Fluid dynamic analysis of trees influence in dispersion of pollutant in urban street canyon." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12041/.
Повний текст джерелаMarai, S. V. "LA MODELLISTICA TERMO FLUIDODINAMICA NELLO STUDIO DEI PROCESSI DI TRASFORMAZIONE DEI PRODOTTI AGRO-ALIMENTARI." Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/217270.
Повний текст джерелаThe model is a conceptual representation (often simplified) of the real world or a its part, able to explain the functioning through a series of laws that represent it. These laws describe the basic principles of a theory and it is not always possible to fully solve it in an analytical way. When this happens it is possible to use numerical techniques to find the solution by means of software packages dedicated to the purpose. The development of the numerical model is composed of three distinct phases: the first (pre-processing) is the insertion of input data concerning the material, the boundary conditions of the process and the definition of the grid of resolution of the spatial domain (mesh) , the second (solver) is the resolution of equations that describe the phenomenon and the third (post-processing) is the visualization of the results. The models are a simple insertion of physical data within a software which uses them to provide a result, but is decisive the quality of the input data for the value or less of a model, and the quality of these data is obtained with rigorous research methods, developed ad hoc for each experience. The emphasis of this thesis is that modeling is not just learning to use a software, which, although extremely complex, definitely not ready for the world of research. The development of a model leading to the development and learning of new research techniques, dealing with different challenges every day, through different approaches from classical procedures, so as to continuously expand the cultural and entering a personal innovative methodology and the successful consolidated methods. There were followed with this method five different studies, which made me deal with problems relating to their specific resolution for each search: • Cooking of bakery products; • Media drying grapes; • Tartaric precipitation in wine; • Heat transfer in a pan; • Cooling system passive Icepack. The baking of a bakery product is an extremely complex process, where an infinite number of transformations physical, chemical and biochemical changes occur. The physical characteristics (particularly the diffusivity of the water within the matrix of the biscuit) are difficult to define, as well as the boundary conditions (absolute humidity of the cooking chamber and heat transfer convective coefficient). The determination of the mesh has been changed from the automatic software to improve the definition of the variables that are involved. Once the equations were solved the different views of the results have allowed us to identify the evolution of the temperature and humidity both spatial and temporally. The model was solved as a simultaneous heat and mass transfer, with a thickening of the mesh in the neighborhood of the points where the variables change more. The characterization of the variables was made with experiments specifically for the occasion. The various supports for the drying of the grapes that have been tested have completely different characteristics, both from a point of view of material (plastic, wood, bamboo, resins) that from a structural point of view (cassettes of different sizes and with different drawings between full and empty spaces). The big issue of this model, which set out the objective of determining the velocity field inside the different containers, has been to define the best geometry for each media type. The drawing representing the cassette in every detail appeared to be extremely complex and therefore with a number of degrees of freedom so high that even a large power computer could not complete the processing. The model, considering the speeds involved, has been resolved by ignoring the details of the parts where the flow of air and the wall appeared to be parallel. Tartaric precipitation of the wine is made by exploiting the different levels of solubility as a function of temperature. In particular to a reduction of the temperature corresponds to a decrease of the solubility. This process, that is a simple cooling, is extremely complex for the involvement of many chemical species and secondary phenomena. The model was solved through a series of models not coupled, each of which deals with one aspect of the phenomenon. The heating of a pan is a search which was performed in order to emphasize the difficulty of modeling the food matrix. It is a study on different steps, in increasing difficulty leading to the definition of the cooking of a disc of potato on a pan. The first model involves the empty pan on a electric heater, and the error between the experimental data and the simulation is around 4%. In the second has been added to the first model an aluminum disk with known properties, and the error is passed to 4.4%. In the third model, the aluminum disk was replaced with a potato disk, the material chosen for the many known properties, and the error is passed to about 22%. The Icepack is a polystyrene box with inside an hermetic case full of frozen water. The latent heat of fusion of ice keeps the internal temperature of the box close to 0 ° C until complete dissolution of ice. This system has been exploited to reduce the heat of the field by blueberries just after harvesting. The process has been simplified without considering the convection inside the box and assuming at first a simpler geometry than that of real blueberries. A subsequent adaptation of the model has provided for the definition of a geometry more similar to the real one (blueberries simulated by means of beads) with an increase of the accuracy of the results.
Bertozzi, Barbara. "Feasibility study for understanding ice cave microclimate through thermo-fluid dynamics approaches." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Знайти повний текст джерелаMANZATO, GIACOMO. "Development of multi-functional nanostructured membranes for airborne particles collection, fluidic sensing and co-localized plasmonic enhancement." Doctoral thesis, Università degli studi di Genova, 2022. http://hdl.handle.net/11567/1088143.
Повний текст джерелаAngeli, Cesare. "Analytical solutions for the run-up of long water waves excited by time-independent and time-dependent forcing." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21772/.
Повний текст джерелаPastor, Galiano Ester Lorena. "Contribución al estudio del comportamiento de silicio poroso nano-estructurado en fluidos corporales simulados para el desarrollo de nuevos materiales biocompatibles y biodegradables." Doctoral thesis, Universitat Politècnica de València, 2008. http://hdl.handle.net/10251/1985.
Повний текст джерелаPastor Galiano, EL. (2008). Contribución al estudio del comportamiento de silicio poroso nano-estructurado en fluidos corporales simulados para el desarrollo de nuevos materiales biocompatibles y biodegradables [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/1985
Palancia
Frigioni, Antonio. "Precipitazioni nevose associate ad eventi di bora anticiclonica nel bacino dell’Adriatico: ruolo del mare e dell’orografia." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17963/.
Повний текст джерелаTartuferi, Mariano. "Sviluppo dell'eolico offshore nel Mare Adriatico: ricostruzione del campo di vento di mesoscala e uso di reti neurali artificiali per la previsione di producibilità energetica a breve termine." Doctoral thesis, Università Politecnica delle Marche, 2015. http://hdl.handle.net/11566/242933.
Повний текст джерелаThe P.O.W.E.R.E.D. project (www.powered-ipa.it) has been funded aiming to the definition of shared guidelines for the future development of offshore wind energy in the Adriatic Sea. Several activities have been planned in order to achieve such strategic goal. By means of a mesoscale meteorological model of the whole Adriatic basin (implemented in the numerical code PSU/NCAR MM5v3), has been performed the hindcasting analysis of the regional anemometric resources for the period 2009-2011. Further investigations have been completed for 2008 and 2012, beyond the project’s requirements. The obtained results allowed elaborating a middle term characterization of the wind energy potential in the area: the major wind energy resources are all localized between the coasts of Apulia Region, Montenegro and Albania. Thus, the southern portion of the Adriatic basin appears the most promising area for the future installation of offshore wind farms. The validation of the mesoscale meteorological model requires observed wind data, collected by anemometric stations able to perform high quality wind measurements. Numerical results exhibit a good agreement with observations of some sample stations, awaiting the completion of the P.O.W.E.R.E.D. network of anemometric towers. One of these measuring stations should be of offshore type: a CFD (Computational Fluid Dynamics) analysis of an existing marine platform proved the technical feasibility of exploiting such type of structures as supporting system of an offshore anemometric tower. Finally, a short-term (24-48 h) wind power forecasting approach has been developed in order to elaborate accurate predictions of the energy production of a wind farm: key features of such method are in the integrated use of a physical model (MM5v3) and ANNs (Artificial Neural Networks). A test case in an existing wind farm confirmed the ability of the proposed hybrid forecasting system to produce accurate wind energy estimations.
Pancaldi, Marco. "Impact of waterbody evaporation in an urban canyon investigated through large-eddy simulations." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25662/.
Повний текст джерелаRENDINA, Cristian. "STUDY OF THE IMPACT OF MODELLING SEA SURFACE TEMPERATURE IN A MONTHLY ATMOSPHERIC ENSEMBLE PREDICTION SYSTEM." Doctoral thesis, Università degli studi di Ferrara, 2012. http://hdl.handle.net/11392/2389449.
Повний текст джерелаDi, Santo Dario. "Study of anabatic flows using large-eddy simulations in a simplified geometry." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20762/.
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