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Scheda Riassuntiva
Anno Accademico 2017/2018
Scuola Scuola di Ingegneria Industriale e dell'Informazione
Insegnamento 083903 - HEAT TRANSFER AND THERMAL ANALYSIS
Docente Guilizzoni Manfredo Gherardo
Cfu 6.00 Tipo insegnamento Monodisciplinare

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing Ind - Inf (Mag.)(ord. 270) - BV (469) AERONAUTICAL ENGINEERING - INGEGNERIA AERONAUTICA*AZZZZ083903 - HEAT TRANSFER AND THERMAL ANALYSIS
Ing Ind - Inf (Mag.)(ord. 270) - BV (470) SPACE ENGINEERING - INGEGNERIA SPAZIALE*AZZZZ083903 - HEAT TRANSFER AND THERMAL ANALYSIS
Ing Ind - Inf (Mag.)(ord. 270) - BV (479) MANAGEMENT ENGINEERING - INGEGNERIA GESTIONALE*AZZZZ083903 - HEAT TRANSFER AND THERMAL ANALYSIS
Ing Ind - Inf (Mag.)(ord. 270) - BV (483) MECHANICAL ENGINEERING - INGEGNERIA MECCANICA*AZZZZ083903 - HEAT TRANSFER AND THERMAL ANALYSIS

Programma dettagliato e risultati di apprendimento attesi

Focus


The course is focused on an advanced treatment of heat transfer and it is aimed at providing knowledge and know-how for the solution of heat transfer and thermal control problems, particularly for space applications.


Detailed description of the topics

1. Heat conduction.
The Fourier hypothesis and the thermal conductivity. The heat diffusion equation; initial-, boundary- and interface- conditions. Steady-state conduction: one-dimensional solutions; thermal resistances and equivalent circuits. Transient conduction: lumped-capacity solutions; analytical solutions in a semi-infinite medium with constant or periodic temperature boundary condition; thermal waves.

2. Convective heat transfer.
The governing equations, dimensionless version of the thermo-fluid dynamics equations and dimensionless groups of interest for convection. Free and forced convection in external flows: laminar and turbulent boundary layers, micro- and macro- scales, velocity profiles; some relevant heat transfer correlations for flows over flat plate, cylinders, spheres and bluff bodies. Forced convection inside ducts: the bulk temperature, the fully developed region and the Graetz problem; some relevant correlations for the friction factor and the heat transfer coefficient; the logarithmic mean temperature difference.
Boiling and condensation: evaporation; introduction to capillary and interface phenomena; metastable states; pool boiling, the boiling curve, critical and minimum heat fluxes, factors affecting the boiling curve; introduction to two-phase flow, forced-convection boiling inside tubes; film condensation on vertical flat plates and inside/outside tubes, dropwise condensation.

3. Radiative transfer.
Overview about radiation and radiation-matter interaction. Thermal radiation, radiation intensity, directional, spectral and total quantities, irradiation and radiosity. Blackbody radiation: Planck distribution, Stefan-Boltzmann law, Wien displacement law, band emission. Emission, absorption, reflection, transmission for real, diffuse and gray emitters; selective surfaces; Kirchhoff law. Radiation exchange between gray surfaces, view factors and their relationships, radiation exchange between gray surfaces in an enclosure. Radiation in gases: emission, absorption, scattering. Solar and environmental radiation.

4. Thermal analysis.
Introduction to thermal control. Operative and survival limits. Internal and external thermal sources. Heat sinks, cooling/insulating devices for electronic/space equipment: fillers, thermal bridges, cold plates, heat pipes, Peltier cells, coatings and clothing, primary and secondary surface mirrors, space radiators.

5. Thermal modeling.
Design of heat exchangers and extended surfaces. Lumped-capacity approach: arithmetic and diffusive nodes, mesh types, thermal resistances. Introduction to numerical methods and codes to solve thermal equivalent circuits for space applications; steady and transient multidimensional conduction by means of finite difference approximation, basic forms, explicit and implicit schemes, direct and iterative solving methods; FEM and FVM numerical codes; ray-tracing and Monte Carlo methods for radiation.


Note Sulla Modalità di valutazione

Course organization and exams

The course is structured in lessons, exercises and laboratories. Exercises are devoted to the solution of problems related to heat transfer analyses and thermal design, focused both on general applications and on space and propulsion topics. Laboratories are devoted to the use of suitable software for the solution of thermo-fluid dynamics problems.

Exams are scheduled only after the course end (no intermediate test is offered). They consist of a written test including theoretical questions and numerical exercises on the course topics.


Bibliografia
Risorsa bibliografica facoltativaJohn H. Lienhard IV, John H. Lienhard V, A Heat Transfer Textbook, 4th edition, ISBN: 978-0486479316
Note:

The textbook can be dowloaded from the given Web page

Risorsa bibliografica facoltativaTheodore L. Bergman, Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt, Fundamentals of Heat and Mass Transfer, 7th Edition, Editore: John Wiley & Sons, Anno edizione: 2011, ISBN: 978-0470917855

Mix Forme Didattiche
Tipo Forma Didattica Ore didattiche
lezione
38.0
esercitazione
22.0
laboratorio informatico
8.0
laboratorio sperimentale
0.0
progetto
0.0
laboratorio di progetto
6.0

Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua Inglese
Disponibilità di libri di testo/bibliografia in lingua inglese
Possibilità di sostenere l'esame in lingua inglese
Disponibilità di supporto didattico in lingua inglese
schedaincarico v. 1.6.4 / 1.6.4
Area Servizi ICT
10/07/2020