29243 - Technical Physics T

• Docente: Michele Celli
• Credits: 6
• SSD: ING-IND/10
• Language: Italian
• Campus: Bologna
• Corso: First cycle degree programme (L) in Mechanical Engineering (cod. 0927)

Learning outcomes

The student masters the criteria for addressing the energetic study of machines and systems by examining the main thermodynamic transformations between thermal and mechanical energy; he/she also acquires the basic elements needed to understand the heat transfer mechanisms.

Course contents

The course is devoted to the basic elements of thermodynamics, both general and oriented to the energy conversion applications, and to the principles of heat transfer. Starting from the laws of thermodynamics and their applications to pure substances and mixtures, the basic features of thermodynamic cycles are analysed. The student is expected to learn the physical elements of thermal conduction, thermal convection and radiation heat transfer and their main engineering applications.

Applied Thermodynamics

First law and energy - Second law - Thermodynamic temperature - Clausius inequality - Definition of entropy - Principle of entropy non-decrease - Gibbs equation - Gibbs phase rule - Power engines and refrigeration engines - Thermodynamics of control volumes: energy balance and entropy balance - Thermodynamic relationships - Specific heats - Equation of state - Ideal gas - Liquid-vapour equilibrium and vapours - Thermodynamic diagrams - Mixtures of ideal gases - Rankine cycle and compression refrigeration cycle.

Thermal Conduction

Fourier's law and Fourier's equation - Simple cases of stationary conduction in plane geometry, cylindrical geometry and spherical geometry - Thermal resistance, thermal resistances in series and parallel - Non-stationary conduction.

Thermal Convection

Fluids - Viscosity - Balance equations - Boussinesq approximation - Laminar and turbulent flow - Boundary layer - Forced convection - The buoyancy force - Natural and mixed convection.

Black body - Radiation laws - Radiation heat transfer between black bodies and gray bodies - Form factors - Radiation coefficient.

Y. A. Çengel - Termodinamica e Trasmissione del Calore - McGraw-Hill - 2009

S. Lazzari, B. Pulvirenti, E. Rossi di Schio - Esercizi Risolti di Termodinamica, Moto dei Fluidi e Termocinetica - Progetto Leonardo - 2006

Teaching methods

The lectures are carried out by displaying slides and by employing a virtual blackboard for adding the details on theoretical notions and exercises.

Assessment methods

The exam consists of a test to be carried out by employing EOL application or by a in class written test depending on the current pandemic circumstances.

The exam is a multiple choice test focused on the evaluation of both the theoretical knowledge and the ability of solving exercises. There are 8 theoretical questions where every correct answer is worth 2 points, each incorrect answer is -0.5 points, each answer left blank is worth 0 points. There are also 3 exercises to be solved, for which each correct answer is worth 6 points, each incorrect answer is -1.5 points, each answer left blank is worth 0 points. The mark on the written test can be: insufficient ("ns") if the total score is less than 18; sufficient if the total score greater than or equal to 18, 30 cum laude ("30L") if all the 11 questions have been answered correctly.

The test, when the mark is greater/equal 18, allows one to record the exam. Students who wish to improve their marks can retake the test. Every time the student participate to a test, the marks obtained before will be erased.

In order to record the mark of "TECHNICAL PHYSICS AND FLUID MECHANICS T (I.C.)", the mark obtained for "TECHNICAL PHYSICS T" expires after 12 months. After this deadline the student has to repeat the exam. Both the professors of TECHNICAL PHYSICS T and FLUID MECHANICS T can record the mark.

The mark of "TECHNICAL PHYSICS AND FLUID MECHANICS T (I.C.)" is obtained by applying the arithmetic mean of the marks obtained by the student for "TECHNICAL PHYSICS T" and "FLUID MECHANICS T".

In order to record the mark, the student has to send an email to michele.celli3@unibo.it containing the explicit request for recording the mark obtained.

Teaching tools

Lecture notes and exercises available on

https://virtuale.unibo.it

Video recording of the lectures available on STREAM - Microsoft 365

Office hours

See the website of Michele Celli

SDGs

This teaching activity contributes to the achievement of the Sustainable Development Goals of the UN 2030 Agenda.