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Dissertations / Theses on the topic 'Fisica tecnica industriale'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 April 2023

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1

Terzi, Luigi Andrea <1972&gt. "Nuove prospettive per la produzione energetica." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/205/1/PhDTesiTerzi.pdf.

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Terzi, Luigi Andrea <1972&gt. "Nuove prospettive per la produzione energetica." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/205/.

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3

Pieri, Stefano <1977&gt. "Multi-objective optimization of microgas turbine recuperatos." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/415/1/Tesi_Pieri_Stefano.pdf.

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4

Pieri, Stefano <1977&gt. "Multi-objective optimization of microgas turbine recuperatos." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/415/.

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5

Pinto, Francesco <1978&gt. "Application of evolutionary techniques to energy transfer efficiency in heat transfer problems and low consumption buildings." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/419/1/Pinto.pdf.

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6

Pinto, Francesco <1978&gt. "Application of evolutionary techniques to energy transfer efficiency in heat transfer problems and low consumption buildings." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/419/.

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7

Copiello, Diego <1980&gt. "Multiobjective genetic algorithms applied to heat transfer problems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1218/1/copiello_diego_tesi.pdf.

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In the present work, the multi-objective optimization by genetic algorithms is investigated and applied to heat transfer problems. Firstly, the work aims to compare different reproduction processes employed by genetic algorithms and two new promising processes are suggested. Secondly, in this work two heat transfer problems are studied under the multi-objective point of view. Specifically, the two cases studied are the wavy fins and the corrugated wall channel. Both these cases have already been studied by a single objective optimizer. Therefore, this work aims to extend the previous works in

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8

Copiello, Diego <1980&gt. "Multiobjective genetic algorithms applied to heat transfer problems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1218/.

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In the present work, the multi-objective optimization by genetic algorithms is investigated and applied to heat transfer problems. Firstly, the work aims to compare different reproduction processes employed by genetic algorithms and two new promising processes are suggested. Secondly, in this work two heat transfer problems are studied under the multi-objective point of view. Specifically, the two cases studied are the wavy fins and the corrugated wall channel. Both these cases have already been studied by a single objective optimizer. Therefore, this work aims to extend the previous works in

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9

Tomarchio, Valerio <1978&gt. "Magnetohydrodynamic Effects On Mixed Convection Flows In Channels And Ducts." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1411/1/tomarchio_valerio_tesi.pdf.

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This work focuses on magnetohydrodynamic (MHD) mixed convection flow of electrically conducting fluids enclosed in simple 1D and 2D geometries in steady periodic regime. In particular, in Chapter one a short overview is given about the history of MHD, with reference to papers available in literature, and a listing of some of its most common technological applications, whereas Chapter two deals with the analytical formulation of the MHD problem, starting from the fluid dynamic and energy equations and adding the effects of an external imposed magnetic field using the Ohm's law and the definiti

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10

Tomarchio, Valerio <1978&gt. "Magnetohydrodynamic Effects On Mixed Convection Flows In Channels And Ducts." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1411/.

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This work focuses on magnetohydrodynamic (MHD) mixed convection flow of electrically conducting fluids enclosed in simple 1D and 2D geometries in steady periodic regime. In particular, in Chapter one a short overview is given about the history of MHD, with reference to papers available in literature, and a listing of some of its most common technological applications, whereas Chapter two deals with the analytical formulation of the MHD problem, starting from the fluid dynamic and energy equations and adding the effects of an external imposed magnetic field using the Ohm's law and the definiti

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11

Celli, Michele <1980&gt. "Stability, viscous dissipation and local thermal non-equilibrium in fluid saturated porous media." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2485/1/Celli_Michele_PhD_Thesis.pdf.

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In this thesis, the field of study related to the stability analysis of fluid saturated porous media is investigated. In particular the contribution of the viscous heating to the onset of convective instability in the flow through ducts is analysed. In order to evaluate the contribution of the viscous dissipation, different geometries, different models describing the balance equations and different boundary conditions are used. Moreover, the local thermal non-equilibrium model is used to study the evolution of the temperature differences between the fluid and the solid matrix in a thermal boun

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12

Celli, Michele <1980&gt. "Stability, viscous dissipation and local thermal non-equilibrium in fluid saturated porous media." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2485/.

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In this thesis, the field of study related to the stability analysis of fluid saturated porous media is investigated. In particular the contribution of the viscous heating to the onset of convective instability in the flow through ducts is analysed. In order to evaluate the contribution of the viscous dissipation, different geometries, different models describing the balance equations and different boundary conditions are used. Moreover, the local thermal non-equilibrium model is used to study the evolution of the temperature differences between the fluid and the solid matrix in a thermal boun

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13

Ragazzini, Chiara <1980&gt. "Studio teorico e computazionale legato agli aspetti fluidodinamici in idrodinamica navale." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2564/1/ragazzini_chiara_tesi.pdf.

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14

Ragazzini, Chiara <1980&gt. "Studio teorico e computazionale legato agli aspetti fluidodinamici in idrodinamica navale." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2564/.

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15

Terlizzese, Tiziano <1974&gt. "Second law analysis and simulation techniques for the energy optimization of buildings." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2743/1/terlizzese_tiziano_tesi.pdf.

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The research activity described in this thesis is focused mainly on the study of finite-element techniques applied to thermo-fluid dynamic problems of plant components and on the study of dynamic simulation techniques applied to integrated building design in order to enhance the energy performance of the building. The first part of this doctorate thesis is a broad dissertation on second law analysis of thermodynamic processes with the purpose of including the issue of the energy efficiency of buildings within a wider cultural context which is usually not considered by professionals in the ener

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16

Terlizzese, Tiziano <1974&gt. "Second law analysis and simulation techniques for the energy optimization of buildings." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2743/.

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The research activity described in this thesis is focused mainly on the study of finite-element techniques applied to thermo-fluid dynamic problems of plant components and on the study of dynamic simulation techniques applied to integrated building design in order to enhance the energy performance of the building. The first part of this doctorate thesis is a broad dissertation on second law analysis of thermodynamic processes with the purpose of including the issue of the energy efficiency of buildings within a wider cultural context which is usually not considered by professionals in the ener

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17

Flacco, Giuseppe <1981&gt. "Edificio-Impianto: ruolo dell'involucro e dell'impiantistica. Miglioramento delle prestazioni energetiche degli edifici attraverso progetti innovativi che anticipano l'applicazione della Direttiva CE 2010/31." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3359/1/FLACCO_GIUSEPPE_TESI.pdf.

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La tematica del presente scritto è l’analisi teorico-sperimentale del sistema edificio-impianto, che è funzione delle soluzioni progettuali adottate, dei componenti scelti e del tipo di conduzione prevista. La Direttiva 2010/31/CE sulle prestazioni energetiche degli edifici, entrata in vigore l’8 luglio 2010, pubblicata sulla Gazzetta Europea del 18 giugno 2010, sostituirà, dal 1º febbraio 2012, la direttiva 2002/91/CE. La direttiva prevede che vengano redatti piani nazionali destinati ad aumentare il numero di “edifici a energia quasi zero” e che entro il 31 dicembre 2020 tutti gli edifici

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Flacco, Giuseppe <1981&gt. "Edificio-Impianto: ruolo dell'involucro e dell'impiantistica. Miglioramento delle prestazioni energetiche degli edifici attraverso progetti innovativi che anticipano l'applicazione della Direttiva CE 2010/31." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3359/.

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La tematica del presente scritto è l’analisi teorico-sperimentale del sistema edificio-impianto, che è funzione delle soluzioni progettuali adottate, dei componenti scelti e del tipo di conduzione prevista. La Direttiva 2010/31/CE sulle prestazioni energetiche degli edifici, entrata in vigore l’8 luglio 2010, pubblicata sulla Gazzetta Europea del 18 giugno 2010, sostituirà, dal 1º febbraio 2012, la direttiva 2002/91/CE. La direttiva prevede che vengano redatti piani nazionali destinati ad aumentare il numero di “edifici a energia quasi zero” e che entro il 31 dicembre 2020 tutti gli edifici

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19

Conti, Alessandra <1979&gt. "Fluidodinamica biomedica computazionale del flusso sanguigno in presenza di affezioni strumentali e/o patologiche." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4328/1/Tesi_Dottorato_Alessandra_Conti_mod2.pdf.

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La tesi di Dottorato studia il flusso sanguigno tramite un codice agli elementi finiti (COMSOL Multiphysics). Nell’arteria è presente un catetere Doppler (in posizione concentrica o decentrata rispetto all’asse di simmetria) o di stenosi di varia forma ed estensione. Le arterie sono solidi cilindrici rigidi, elastici o iperelastici. Le arterie hanno diametri di 6 mm, 5 mm, 4 mm e 2 mm. Il flusso ematico è in regime laminare stazionario e transitorio, ed il sangue è un fluido non-Newtoniano di Casson, modificato secondo la formulazione di Gonzales & Moraga. Le analisi numeriche sono realizzate

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20

Conti, Alessandra <1979&gt. "Fluidodinamica biomedica computazionale del flusso sanguigno in presenza di affezioni strumentali e/o patologiche." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4328/.

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La tesi di Dottorato studia il flusso sanguigno tramite un codice agli elementi finiti (COMSOL Multiphysics). Nell’arteria è presente un catetere Doppler (in posizione concentrica o decentrata rispetto all’asse di simmetria) o di stenosi di varia forma ed estensione. Le arterie sono solidi cilindrici rigidi, elastici o iperelastici. Le arterie hanno diametri di 6 mm, 5 mm, 4 mm e 2 mm. Il flusso ematico è in regime laminare stazionario e transitorio, ed il sangue è un fluido non-Newtoniano di Casson, modificato secondo la formulazione di Gonzales & Moraga. Le analisi numeriche sono realizzate

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21

Magnini, Mirco <1982&gt. "CFD modeling of two-phase boiling flows in the slug flow regime with an interface capturing technique." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4437/1/Magnini_Mirco_tesi.pdf.

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The objective of this thesis was to improve the commercial CFD software Ansys Fluent to obtain a tool able to perform accurate simulations of flow boiling in the slug flow regime. The achievement of a reliable numerical framework allows a better understanding of the bubble and flow dynamics induced by the evaporation and makes possible the prediction of the wall heat transfer trends. In order to save computational time, the flow is modeled with an axisymmetrical formulation. Vapor and liquid phases are treated as incompressible and in laminar flow. By means of a single fluid approach, the flo

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22

Magnini, Mirco <1982&gt. "CFD modeling of two-phase boiling flows in the slug flow regime with an interface capturing technique." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4437/.

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The objective of this thesis was to improve the commercial CFD software Ansys Fluent to obtain a tool able to perform accurate simulations of flow boiling in the slug flow regime. The achievement of a reliable numerical framework allows a better understanding of the bubble and flow dynamics induced by the evaporation and makes possible the prediction of the wall heat transfer trends. In order to save computational time, the flow is modeled with an axisymmetrical formulation. Vapor and liquid phases are treated as incompressible and in laminar flow. By means of a single fluid approach, the flo

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23

Morsiani, Riccardo <1983&gt. "Analisi sperimentale dell'influenza dei parametri di processo sulla resistenza di contatto tra polimero e stampo durante la formatura." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4890/1/Morsiani_Riccardo_Tesi.pdf.

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Con gli strumenti informatici disponibili oggi per le industrie, in particolar modo coi software CAE, le possibile simulare in maniera più che soddisfacente i fenomeni fisici presenti in natura. Anche il raffreddamento di un manufatto in polimero può venire simulato, a patto che si conoscano tutti i dati dei materiali e delle condizioni al contorno. Per quanto riguarda i dati dei materiali, i produttori di polimeri sono molto spesso in grado di fornirli, mentre le condizioni al contorno devono essere padroneggiate dal detentore della tecnologia. Nella pratica, tale conoscenza è al più incomple

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24

Morsiani, Riccardo <1983&gt. "Analisi sperimentale dell'influenza dei parametri di processo sulla resistenza di contatto tra polimero e stampo durante la formatura." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4890/.

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Con gli strumenti informatici disponibili oggi per le industrie, in particolar modo coi software CAE, le possibile simulare in maniera più che soddisfacente i fenomeni fisici presenti in natura. Anche il raffreddamento di un manufatto in polimero può venire simulato, a patto che si conoscano tutti i dati dei materiali e delle condizioni al contorno. Per quanto riguarda i dati dei materiali, i produttori di polimeri sono molto spesso in grado di fornirli, mentre le condizioni al contorno devono essere padroneggiate dal detentore della tecnologia. Nella pratica, tale conoscenza è al più incomple

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25

Greppi, Matteo <1985&gt. "Numerical optimization,modeling and system evaluation of a thermophotovoltaic hybrid panel." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5415/1/Greppi_Matteo_Tesi.pdf.

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Photovoltaic (PV) solar panels generally produce electricity in the 6% to 16% efficiency range, the rest being dissipated in thermal losses. To recover this amount, hybrid photovoltaic thermal systems (PVT) have been devised. These are devices that simultaneously convert solar energy into electricity and heat. It is thus interesting to study the PVT system globally from different point of views in order to evaluate advantages and disadvantages of this technology and its possible uses. In particular in Chapter II, the development of the PVT absorber numerical optimization by a genetic algorith

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Greppi, Matteo <1985&gt. "Numerical optimization,modeling and system evaluation of a thermophotovoltaic hybrid panel." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5415/.

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Photovoltaic (PV) solar panels generally produce electricity in the 6% to 16% efficiency range, the rest being dissipated in thermal losses. To recover this amount, hybrid photovoltaic thermal systems (PVT) have been devised. These are devices that simultaneously convert solar energy into electricity and heat. It is thus interesting to study the PVT system globally from different point of views in order to evaluate advantages and disadvantages of this technology and its possible uses. In particular in Chapter II, the development of the PVT absorber numerical optimization by a genetic algorith

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27

Yang, Yahui <1984&gt. "Experimental and Numerical Analysis of Gas Forced Convection through Microtubes and Micro Heat Exchangers." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5751/1/Yang_Yahui_tesi.pdf.

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The last decade has witnessed very fast development in microfabrication technologies. The increasing industrial applications of microfluidic systems call for more intensive and systematic knowledge on this newly emerging field. Especially for gaseous flow and heat transfer at microscale, the applicability of conventional theories developed at macro scale is not yet completely validated; this is mainly due to scarce experimental data available in literature for gas flows. The objective of this thesis is to investigate these unclear elements by analyzing forced convection for gaseous flows throu

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28

Yang, Yahui <1984&gt. "Experimental and Numerical Analysis of Gas Forced Convection through Microtubes and Micro Heat Exchangers." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5751/.

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The last decade has witnessed very fast development in microfabrication technologies. The increasing industrial applications of microfluidic systems call for more intensive and systematic knowledge on this newly emerging field. Especially for gaseous flow and heat transfer at microscale, the applicability of conventional theories developed at macro scale is not yet completely validated; this is mainly due to scarce experimental data available in literature for gas flows. The objective of this thesis is to investigate these unclear elements by analyzing forced convection for gaseous flows throu

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29

Naldi, Claudia <1987&gt. "Development and Applications of Simulation Codes for Air-to-Water and Ground-Coupled Heat Pump Systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7438/1/Naldi_Claudia_tesi.pdf.

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In this Thesis, new simulation codes for the evaluation of a heat pump system seasonal performance are presented. The codes apply to electric air-to-water and ground-coupled heat pump systems based on a vapor compression cycle, used for building heating, cooling and domestic hot water production. Numerical models are developed to simulate different kinds of air-to-water heat pumps by means of the bin-method. The models take into account the different operating modes of mono-compressor on-off, multi-compressor and inverter-driven heat pumps. The heat pump system seasonal performance is analyze

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Naldi, Claudia <1987&gt. "Development and Applications of Simulation Codes for Air-to-Water and Ground-Coupled Heat Pump Systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7438/.

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In this Thesis, new simulation codes for the evaluation of a heat pump system seasonal performance are presented. The codes apply to electric air-to-water and ground-coupled heat pump systems based on a vapor compression cycle, used for building heating, cooling and domestic hot water production. Numerical models are developed to simulate different kinds of air-to-water heat pumps by means of the bin-method. The models take into account the different operating modes of mono-compressor on-off, multi-compressor and inverter-driven heat pumps. The heat pump system seasonal performance is analyze

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31

Puccetti, Giacomo <1988&gt. "Optical Techniques for Experimental Tests in Microfluidics." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7534/1/Puccetti_Giacomo_tesi.pdf.

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This PhD dissertation deals with the use of optical, non-invasive measurement techniques for the investigation of single and two-phase flows in microchannels. Different experimental techniques are presented and the achieved results are critically discussed. Firstly, the inverse use of the micro Particle Image Velocimetry technique for the detection of the real shape of the inner cross-section of an optical accessible microchannel is shown by putting in evidence the capability of this technique to individuate the presence of singularities along the wetted perimeter of the microchannel. Th

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Puccetti, Giacomo <1988&gt. "Optical Techniques for Experimental Tests in Microfluidics." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7534/.

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This PhD dissertation deals with the use of optical, non-invasive measurement techniques for the investigation of single and two-phase flows in microchannels. Different experimental techniques are presented and the achieved results are critically discussed. Firstly, the inverse use of the micro Particle Image Velocimetry technique for the detection of the real shape of the inner cross-section of an optical accessible microchannel is shown by putting in evidence the capability of this technique to individuate the presence of singularities along the wetted perimeter of the microchannel. Th

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33

Jahanbin, Aminhossein <1987&gt. "Finite element analysis of heat transfer in double U-tube borehole heat exchangers." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amsdottorato.unibo.it/7844/1/Thesis.pdf.

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The present Ph.D. dissertation deals with the finite element analysis of the heat transfer processes in double U-tube Borehole Heat Exchangers, called BHEs. In the evaluation of thermal response tests (TRTs), in the design of the BHE fields, and in the dynamic simulation of ground-coupled heat pumps (GCHPs), the mean temperature Tm of the working fluid in a BHE, is usually approximated by the arithmetic mean of inlet and outlet temperatures. In TRTs, this approximation causes an overestimation of the thermal resistance of the heat exchanger. In the dynamic simulation of GCHPs, this approximati

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Dongellini, Matteo <1988&gt. "Dynamic Modeling and Seasonal Performance Evaluation of Air-to-Water Heat Pump Systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amsdottorato.unibo.it/7901/1/Dynamic%20modeling%20and%20seasonal%20performance%20evaluation%20of%20air-to-water%20heat%20pump%20systems.pdf.

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In this Thesis a series of numerical models for the evaluation of the seasonal performance of reversible air-to-water heat pump systems coupled to residential and non-residential buildings are presented. The exploitation of the energy saving potential linked to the adoption of heat pumps is a hard task for designers due to the influence on their energy performance of several factors, like the external climate variability, the heat pump modulation capacity, the system control strategy and the hydronic loop configuration. The aim of this work is to study in detail all these aspects. In the fir

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35

Rostami, Behnam <1986&gt. "Experimental Analysis of Droplet Generation in Presence of Newtonian and non-Newtonian Flows within Microjunctions." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amsdottorato.unibo.it/8600/1/Thesis_final_Behnam%20Rostami.pdf.

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Microdroplets have attracted increasing interest among researchers due to the wide spread of promising technological applications such as biological analysis, cancer diagnosis, drug discovery and chemical reactions. With respect to traditional emulsion methods which are usually able to produce droplets with a broad size variation (polydispersed emulsions), microfluidic devices have been developed to produce monodispersed microdroplets with a controllable size. The diameter and size variation of droplets are controlled by a series of parameters, including the geometries and dimensions of the mi

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36

Campana, Jean Pierre <1990&gt. "ALMABEST: a new whole building energy simulation Simulink-based tool for NZEB design." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/8993/3/TESI%20Campana.pdf.

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In this Thesis the new tool ALMABEST for the dynamic energy simulation of the whole building coupled to HVAC systems is presented. This tool, developed in the Matlab environment, consists of two libraries, ALMABuild and ALMAHVAC, dedicated to the building and HVAC system modelling respectively; this Thesis is focused in particular on ALMABuild. In the first part of this Thesis, the description of ALMABuild, which consists of a Simulink library and a set of Graphical User Interfaces (GUIs), is presented. It is emphasized how the use of these GUIs allows to overcome the drawback of other Simuli

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37

Lucchi, Michael <1989&gt. "Dynamic models for the analysis of vapour-compression refrigerating machines." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amsdottorato.unibo.it/9359/1/Michael%20Lucchi%20-%20Cycle%20XXXII.pdf.

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Vapour-compression refrigeration systems represent one of the most relevant fields in terms of energy consumption. Among the research works aimed at reducing their environmental impact, those related to control systems are appealing, since they usually involve lower costs than interventions at system level and directly affects the energy consumption. In this work, a library of models able to reproduce the dynamics of the main components of a vapour-compression refrigeration machine has been developed in Matlab/SIMULINK to supply the building blocks to investigate the effects of different cont

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Rehman, Danish <1988&gt. "Experimental and Numerical Analysis of Gas Flows in Microchannels and Micro Heat Exchanger." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amsdottorato.unibo.it/9405/1/RehmanDanish_Ciclo32_Thesis.pdf.

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Due to increased interest in miniaturization, great attention has been given in the recent decade to the micro heat exchanging systems. Literature survey suggests that there is still a limited understanding of gas flows in micro heat exchanging systems. The aim of the current thesis is to further the understanding of fluid flow and heat transfer phenomenon inside such geometries when a compressible working fluid is utilized. A combined experimental and numerical approach has been utilized in order to overcome the lack of employable sensors for micro dimensional channels. After conducting a det

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Vayssière, Brandão Pedro <1993&gt. "Linear and nonlinear thermal instability of Newtonian and non-Newtonian fluid saturated porous media." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10143/1/VayssiereBrandao_Pedro_PhD_Thesis.pdf.

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The present work aims to investigate the influence of different aspects, such as non-standard steady solutions, complex fluid rheologies and non-standard porous-channel geometries, on the stability of a Darcy-Bénard system. In order to do so, both linear and nonlinear stability theories are considered. A linear analysis focuses on studying the dynamics of the single disturbance wave present in the system, while its nonlinear counterpart takes into consideration the interactions among the single modes. The scope of the stability analysis is to obtain information regarding the transition from an

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BIONDI, JMMI. "Studio di sistemi e metodologie per il monitoraggio dell'efficienza energetica di frigoriferi industriali." Doctoral thesis, Università Politecnica delle Marche, 2010. http://hdl.handle.net/11566/242144.

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BISIGHINI, Alfio. "Single and double drop impacts onto deep and thick liquid layers." Doctoral thesis, Università degli studi di Bergamo, 2010. http://hdl.handle.net/10446/609.

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The present experimental and analytical study deals with single and double drop impacts onto a deep pool or liquid layers of finite thickness, with a general purpose of understanding the complex flows generated by spray impacts. The study is focused mainly on the observation of the evolution of the crater formed by the drop impacts and the description of the associated flow in the liquid layer. A test rig for the high-speed-visualization of interface phenomena has been built and experimental investigations using highspeed-imaging and image processing have been performed. Single drop impacts o

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DALL'OLIO, Stefano. "Boiling of the R134a inside a glass minichannel : a new approach of flow pattern characterization based on flow visualization." Doctoral thesis, Università degli studi di Bergamo, 2009. http://hdl.handle.net/10446/84.

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VILLA, Fabio. "Effect of Wettability on Phase Change Phenomena." Doctoral thesis, Università degli studi di Bergamo, 2017. http://hdl.handle.net/10446/89510.

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DERIS, ZADEH ALI. "Raffreddamento di macchine elettriche con refrigeranti avanzati." Doctoral thesis, Università degli Studi dell'Aquila, 2021. http://hdl.handle.net/11697/169996.

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The aim of this research is to investigate the adaption of advanced coolants and phase change materials for electric machines in electric/hybrid vehicle applications. The study uses Al2O3 nanoparticles to enhance the heat transfer ability of liquid cooling systems employing the commonly used cooling jacket approach. Employing advanced coolants to improve the heat transfer performance of cooling systems with minimal changes in their structure can be considered as a cost-effective and practical approach to meet the requirements of vehicle applications. In line with this goal, in this research, b

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NERI, Manuela. "Experimental and numerical analysis of heat trasnfer at chimney-roof penetration in relation to the overheating of flammable materials." Doctoral thesis, Università degli studi di Brescia, 2016. https://hdl.handle.net/11379/569289.

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Chimneys convey exhaust gas produced in domestic heating appliances to the external ambient and to do this they have to pass through roofs and oors. The increasing attention to sustainability and energy saving has led to better insulated buildings, with roofs made up of combustible materials. From the point of view of re, a critical point for safety is where chimneys penetrate roofs or walls made of these materials. Currently, chimneys are tested according to the European standard EN 1859, that prescribes the heat stress test and the thermal shock test for verifying the safety dista

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KONA, ALBANA. "EXERGETIC AND THERMOECONOMIC APPROACH FOR OPTIMAL PLANNING OF DISTRICT ENERGY SYSTEMS." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2507718.

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A sustainable urban energy planning for achieving the EU 2020 and 2050 energy goals requires adopting a systemic approach based on reducing end-user energy requirements, recycling energy that otherwise would be wasted and replacing fossil fuels by renewable. District Heating and District Cooling play a key role in such a concept. From the sustainability viewpoint, district heating is an important option to supply heat to the users in urban areas. The energy convenience of such option depends on the annual energy request, the population density and the efficiency in heat production. Among the

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COSENTINO, SARA. "Innovative Modelling Approaches for the Design, Operation and Control of Complex Energy Systems with Application to Underground Infrastructures." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2676713.

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The ventilations systems play a key role in underground infrastructures for health and safety of occupants during normal operation as well as during accidents. Their performances are affected by selection of the optimal design, operation and control that is investigated by predicting air flow. The calculation of ventilation flows and their interaction with fires can be done with different modelling approaches that differ in the accuracy and in the required resources. The 3D computational fluid dynamics (CFD) tools approximate the flow behaviour with a great accuracy but they require high com

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GUERRA, COSIMO. "Experimental Analysis of Solid Oxide Fuel Cells under Dry Reforming of Methane." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2507682.

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During the last decades, the increase in world population, living standard, along with the industrial and transportation sectors led to a pronounced increase in the energy consumption. A consistent improvement of energy production systems is needed to satisfy the world energy demands in terms of fuel and energy. The increasing attention to reduce emissions of pollutants and the concerns about global warming motivate the development of environmental friendly technologies and the enhancement of energy conversion systems efficiency. Although renewable energies are becoming more and more relevant,

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MORCIANO, MATTEO. "Solar energy technologies for passive and low-cost water desalination." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2749553.

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SOTO, ALICIA. "Carbon capture, utilization, and storage (CCUS) and how to accelerate the development and commercialization of carbon base products in the European and US market." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2942140.

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