29243 - Technical Physics T

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.

Radiation Heat Transfer

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

Readings/Bibliography

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 employing both blackboard and slides for both the theoretical notions and the exercises.

Assessment methods

The exam consists of a written test, supplemented by an optional oral examination.

The written 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 is between 18 and 30, 30 cum laude ("30L") if the score is above 32.

Every time the student partecipate to a written test, the mark obtained before will be erased (it is equivalent to start the exam from the very beginning).

The oral exam is for the students who have passed the written test and is optional. The written test, if sufficient, allows one to record the exam. Students who wish to improve their marks in the written test can:
1) take the oral exam, the final mark to be recorded may be higher or lower than that of the written test;
2) retake the written test, with the mark of the previous written test canceled (we do not consider the best among the two).

In order to record the mark of "TECHNICAL PHYSICS AND FLUID MECHANICS T (I.C.)", the mark obtained for Fisica Tecnica 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.

Teaching tools

The classroom lessons are supplemented by the guided solution of exercises.

Links to further information

http://www.unibo.it/docenti/antonio.barletta

Office hours

See the website of Michele Celli

See the website of Antonio Barletta