PARTICLE TECHNOLOGY

International Teaching PARTICLE TECHNOLOGY

0622800027
DIPARTIMENTO DI INGEGNERIA INDUSTRIALE
EQF7
FOOD ENGINEERING
2021/2022



YEAR OF COURSE 2
YEAR OF DIDACTIC SYSTEM 2019
SECONDO SEMESTRE
CFUHOURSACTIVITY
660LESSONS
Objectives
THE COURSE AIMS AT PROVIDING THE PRINCIPLES OF OPERATION AND THE DESIGN METHODOLOGY FOR EQUIPMENT DEDICATED TO STORAGE, TRANSPORT AND PROCESS OF PARTICULATE SOLIDS.

KNOWLEDGE AND UNDERSTANDING
THE STUDENT WILL ACQUIRE KNOWLEDGE AND UNDERSTANDING OF THE FOLLOWING TOPICS:
PARTICLE SIZE, MATERIAL AND PARTICLE DENSITY, POROSITY, SHAPE FACTORS, SURFACE MORPHOLOGY, INTERACTION WITH FLUID MEDIA FOR NON-SPHERICAL PARTICLES HAVING MICROMETRIC AND NANOMETRIC DIMENSIONS. SIZE DISTRIBUTIONS IN A SYSTEM OF PARTICLES AND THEIR DESCRIPTION, SYSTEMS OF MEASUREMENTS, MODELS TO APPROXIMATE THE DISTRIBUTIONS. PARTICLE AND SYSTEM POROSITY AND DENSITY. PHYSICAL-MATHEMATICAL MODELS FOR THE DESCRIPTION OF INTERPARTICLE FORCES. FLOW PROPERTIES OF PARTICLE SYSTEMS AND METHODS OF MEASUREMENT. STORAGE AND EFFLUX OF GRANULAR SOLIDS IN A DENSE PHASE. SIZING PROCEDURES FOR HOPPERS IN SILOS: PROFILES OF WALL STRESSES IN SILOS AND HOPPERS. OPERATING PRINCIPLES, SIZING AND EXCHANGE PROPERTIES OF FLUIDIZED BEDS. BASICS OF THE MODELLING OF GAS-SOLID REACTORS IN FLUIDIZED BED. OPERATING PRINCIPLES AND SIZING OF SETTLERS. ELEMENTS OF PNEUMATIC TRANSPORT AND COMMINUTION.

APPLYING KNOWLEDGE AND UNDERSTANDING – ENGINEERING ANALYSIS
ABILITY TO IDENTIFY THE LIMITS OF VALIDITY AND APPROPRIATENESS OF DIFFERENT METHODS OF CHARACTERIZATION AND MODELING APPROACHES FOR THE SYSTEMS DESCRIBED IN THE COURSE.

APPLYING KNOWLEDGE AND UNDERSTANDING – ENGINEERING DESIGN
ABILITY TO PERFORM THE SIZING OF STORAGE, HANDLING AND PROCESS EQUIPMENT FOR PARTICLE SYSTEMS, EVEN IN THE PRESENCE OF A PROCESS FLUID.

LEARNING SKILLS – INVESTIGATION SKILLS
ABILITY TO MEASURE THE PARTICLE SIZE DISTRIBUTIONS AND SHAPE, THE MAIN MECHANICAL AND FLUIDIZATION PROPERTIES FOR PARTICULATE SYSTEMS.

MAKING JUDGEMENTS - ENGINEERING PRACTICE
ABILITY TO IDENTIFY AND FACE THE CRITICAL PROCESS AND STORAGE CONDITIONS FOR PARTICLE SYSTEMS ON THE BASIS OF THE INFORMATION OBTAINED FROM THEIR CHARACTERIZATION.

COMMUNICATION SKILLS – TRANSVERSAL SKILLS
ABILITY TO PRESENT A TOPIC RELATED TO PARTICLE TECHNOLOGY.

LEARNING SKILLS – TRANSVERSAL SKILLS
ABILITY TO APPLY KNOWLEDGE IN DIFFERENT SITUATIONS THAN THOSE PRESENTED IN THE COURSE AND ABILITY TO REFINE OWN KNOWLEDGE.
Prerequisites
PREREQUISITES OF THE COURSE ARE:
- BASIC CONCEPTS OF STATICS AND DYNAMICS OF SOLIDS
- BASIC CONCEPTS OF CONTINUOUS MECHANICS
- BASIC CONCEPTS OF FLUID DYNAMICS AND MOMENTUM TRANSFER
- BASIC CONCEPTS OF ENGINEERING MATHEMATICS

Contents
PROPERTIES OF PARTICULATE SYSTEMS (TH. 12; PR. 3; LAB. 2)
CHARACTERISTICS OF SINGLE PARTICLES: SIZE, MATERIAL AND PARTICLE DENSITY POROSITY, SHAPE FACTORS, SURFACE MORPHOLOGY, COHESIVE FORCES (VAN DER WAALS, CAPILLARY ED ELECTROSTATIC), FUNDAMENTALS OF THE MECHANICS OF INTERPARTICLE CONTACTS, EQUATION OF MOTION OF SOLID PARTICLES IN FLUIDS, DRAG FORCES, TERMINAL VELOCITY. STATIC ASSEMBLIES OF PARTICLES: DIFFERENT DIAMETERS AVERAGES AND THEIR MEANING, POWDER VOIDAGE AND BULK DENSITY. MECHANICAL PROPERTIES OF ASSEMBLIES OF PARTICLES: COULOMB YIELD CRITERION, MOHR-COULOMB FAILURE ANALYSIS, CHARACTERISTIC ANGLES, THE STRESS-STRAIN RELATIONSHIP, DRAG FORCE BETWEEN A FLUID AND A BED OF PARTICLES. CHARACTERIZATION METHODS FOR POWDER FLOW PROPERTIES (UNIAXIAL COMPACTION TESTER, SHEAR TESTER)

STORAGE AND FLOW OF BULK GRANULAR SOLIDS (TH. 12; PR. 3; LAB. 3)
STORAGE IN SILOS: PROFILES OF THE STRESSES ON THE SILO AND HOPPER WALLS. DISCHARGE RATES OF FREE-FLOWING SOLIDS: SEMI-EMPIRICAL RELATIONSHIPS AND BEVERLOO EQUATION, THE APPROACH OF BROWN AND RICHARDS. DISCHARGE OF COHESIVE SOLIDS: MASS FLOW AND FUNNEL FLOW. DESIGN PROCEDURES TO PREVENT THE FORMATION OF ARCHES AND RATHOLES.

FLUID FLOW THROUGH BEDS OF PARTICLES (TH. 12; PR. 3; LAB. 4)
PERCOLATION: DARCY'S LAW AND ERGUN EQUATION. FLUIDIZATION: MINIMUM VELOCITY FOR FLUIDIZATION, FLUIDIZED BED EXPANSION, BUBBLE MOTION IN FLUIDIZED BEDS. ELEMENTS OF THE THEORY OF TWO-PHASE FLUIDIZATION. BRIEF DESCRIPTION OF THE MODELLING OF SOLID-GAS REACTORS, FLUIDIZED BEDS.

PNEUMATIC TRANSPORT (TH. 4; PR. 2)
CHOCKING VELOCITY AND SALTATION VELOCITY. PRESSURE DROPS IN PNEUMATIC CONVEYORS, DESIGN CRITERIA OF A PNEUMATIC CONVEYING LINE. CYCLONIC AND INERTIAL SEPARATORS. PRINCIPLES OF OPERATION AND DESIGN CRITERIA.

TOTAL HOURS 60 (TH. 40; PR. 11; LAB. 9)
Teaching Methods
THE COURSE IS KEPT IN ENGLISH AND CONSISTS OF FRONT LESSONS (40H), CLASSROOM EXERCISES (11H) AND ACTIVITIES IN LAB (9H) FOR A TOTAL AMOUNT OF 60 HOURS WHICH ARE WORTH 6 CREDITS. LECTURES PROVIDE THE THEORETICAL CONCEPTS IN SUPPORT OF THE TOPICS TREATED IN THE COURSE. CLASSROOM PRACTICE HAS THE MAIN PURPOSE TO APPLY THE CALCULATION PROCEDURES USED TO DERIVE THE CHARACTERIZING PROPERTIES OF PARTICULATE SYSTEMS STARTING FROM EXPERIMENTAL DATA, AS WELL AS THE CALCULATION PROCEDURES USED IN THE DESIGN OF THE UNIT OPERATION RELEVANT TO THE COURSE. LABORATORY PRACTICE INCLUDES THE USE OF THE MAIN CHARACTERIZATION INSTRUMENTS OF PARTICULATE SOLIDS.

LECTURES ARE PROVIDED IN CLASSES IN THE PRESENCE OF STUDENTS. ATTENDANCE TO LECTURES IS STRONGLY RECOMMENDED.
Verification of learning
THE ASSESSMENT OF THE ACHIEVEMENT OF THE LEARNING OUTCOMES WILL BE CARRIED OUT IN AN ORAL EXAMINATION. THE EXAMINATION HAS A VARIABLE DURATION BETWEEN 30 AND 45 MINUTES. THE EXAMINATION WILL INCLUDE THREE QUESTIONS, EACH ON ONE OF THE FOLLOWING TOPICS: THE TECHNIQUES AND THE BASIC PRINCIPLES USED IN THE CHARACTERIZATION OF PARTICULATE SOLIDS; THE DESIGN OF STORAGE EQUIPMENT FOR PARTICULATE SOLIDS; THE BASIC PRINCIPLES AND ON THE APPLICATION OF FLUID - SOLID SYSTEMS.

TO PASS THE EXAM THE STUDENT MUST DEMONSTRATE THE ABILITY TO UNDERSTAND AND KNOW HOW TO APPLY THE MAIN CONCEPTS AND METHODOLOGICAL TOOLS ELUCIDATED IN THE COURSE. THE FINAL MARK, OUT OF THIRTY (THE MAXIMUM IS THIRTY CUM LAUDE), DEPENDS ON THE MASTERING ABILITY OF THE COURSE CONTENTS OBJECT OF THE EXAM, TAKING INTO ACCOUNT THE QUALITY OF THE ORAL REPORTING AND THE JUDGMENT ABILITY DEMONSTRATED. IN PARTICULAR, THE KNOWLEDGE OF THE PRINCIPLES AT THE BASIS OF METHODS FOR THE CHARACTERIZATION OF PARTICULATES SYSTEMS AND OF THE DESIGN OF THE EQUIPMENT DISCUSSED IN THE COURSE IS A NECESSARY CONDITION TO PASS THE EXAM. THE STUDENT ACHIEVES THE EXCELLENCE WHEN HE/SHE IS ABLE TO DEMONSTRATE THE USE IN AUTONOMY OF THESE PRINCIPLES FOR THE COMPLETE AND CORRECT FORMULATION OF RELEVANT MATHEMATICAL MODELS OF MEASUREMENT AND DESIGN PROCEDURES ALSO IN CASES WHICH SHOW SIGNIFICANT ELEMENTS OF DIFFERENCE WITH THE CASES COVERED IN THE COURSE.
Texts
REFERENCE TEXTBOOKS FOR LECTURES ARE:

J.P. SEVILLE, U. TUZUN AND R. CLIFT, PROCESSING OF PARTICULATE SOLIDS, BLACKIE ACADEMIC AND PROFESSIONAL

D. KUNII AND O. LEVENSPIEL, FLUIDIZATION ENGINEERING, BUTTERWORTH-HEINEMANN

R.M. NEDDERMAN, STATICS AND KINEMATICS OF GRANULAR MATERIAL, CAMBRIDGE UNIVERSITY PRESS

D. SCHULZE, POWDERS AND BULK SOLIDS, SPRINGER
More Information
VENUE AND TIMETABLE
THE COURSE IS DELIVERED AT THE DEPARTMENT OF INDUSTRIAL ENGINEERING. PLEASE REFER TO THE DEPARTMENT WEBSITE (HTTPS://CORSI.UNISA.IT/INGEGNERIA-ALIMENTARE/DIDATTICA/CALENDARI OR HTTPS://CORSI.UNISA.IT/INGEGNERIA-CHIMICA-MAGISTRALE/DIDATTICA/CALENDARI) FOR THE INDICATION OF TIMETABLE AND CLASSROOMS.
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