# 29686 - Mechanics of Fluids

### Course Unit Page

• Teacher Irene Daprà

• Credits 6

• SSD ICAR/01

• Language Italian

• Campus of Bologna

• Degree Programme First cycle degree programme (L) in Mechanical Engineering (cod. 0927)

• Course Timetable from Feb 22, 2022 to Jun 07, 2022

### SDGs

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

## Learning outcomes

The Student acquires basic elements of Fluid Mechanics aiming to analize and solve typical problems of fluid plants and machinery.

## Course contents

▪ Introduction: technical problems regarding fluids, flow description.

▪ mechanical and thermodynamic characteristics of fluids.

▪ Continue medium scheme.

▪ Static of fluid. Hydrostatic forces on plane and curved surfaces. Floater equilibrium.

▪ Rigid body motion.

▪ Kinematics of fluids. Flow description, Eulerian and Lagrangian approaches. Velocity. Stream-line and stream function. Material derivative.

▪ Continuity and momentum equation.

▪ Inviscid flow: Euler equation. Bernoulli equation.

▪ Introduction to hydraulic machinery, characteristic numbers, cavitation and NPSH.

▪ General equation of motion for a viscous fluid. Viscous plane and pipe flow. Introduction to lubrification theory.

▪ Dimensional analysis. Buckingham theorem.

▪ Laminar and turbulent flow. Steady pipe flow. Friction and local losses. Moody chart. Flow in non cylindrical ducts. Analysis and design of pipe and duct systems. Solution methods for the verification problem and reliability and economy criteria for an effective design.

▪ Some applications of momentum equation.

▪ Laminar and turbolent pipe flow of a gas.

▪ Waterhammer analysis.

Elastic effects of fluid compressibility and conduit compliance. Propagation of perturbation along conduits. Abrupt and slow flow control actions.

Testi consigliati:

Marchi - Rubatta Meccanica dei fluidi Utet

Citrini - Noseda Idraulica Ed. Ambrosiana Milano

Munson –Okiishi- Huebsch-Rothmayer Meccanica dei fluidi- Cittàstudi Edizioni

Çengel - Cimbala Meccanica dei fluidi (Ed. it. Cozzo-Santoro) McGraw-Hill

Alfonsi - Orsi Problemi di idraulica e meccanica dei fluidi Ed. Ambrosiana Milano

Daprà - Menduni Problemi tecnici di idraulica Patron

## Teaching methods

The course is composed of lectures and class exercises.

## Assessment methods

The assessment is done through an oral test during which the student is called to explain concepts, demonstrations and principles concerning the behavior of fluids; furthermore, the candidate must demonstrate to be able to correctly frame and solve problems related to the static and the motion of fluids in various situations.

The oral test can be taken only after you pass a test made of 20 multiple choice questions. The test is considered passed if you answer 10 questions correctly.

Grades are expressed in thirtieths: the minimum grade for passing the exam is 18/30, the maximum mark is 30/30 with honors. In order to pass the exam, the student must demonstrate sufficient knowledge of all the subjects and not present significant gaps.

The calendar of oral tests and written tests is published well in advance on the AlmaEsami web platform of the University of Bologna. Students intended to take the tests must first register on the list of the chosen exam, then, show a document of recognition on the day of the exam.

The result of the written test is valid for one year or two oral tests; every time the student takes the written test, automatically cancels the previous results.

The overall grade of the course takes into account the grade obtained in Fisica Tecnica.

## Teaching tools

Class lectures with auxiliary documents provided by the teacher

## Office hours

See the website of Irene Daprà