Two Phase Flows
(Section 3)
The Basic Model
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Homework
Homework set#1
Problems 1,2,3,4; Chapter 1, Collier
and Thome.
Due to nex
Two Phase Flows
(Section 10)
Pool Boiling
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Assignment set 4
Problems 6-11
Chapter 2
Due to next Tuesday
Boiling curve
AB
AB-BC
Two Phase Flows
(Section 2)
Introduction
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Overview on Basic Definitions
Void Fraction for
Gas- Liquid Two
Phase Flow
Multiphase
Two Phase Flows
(28-082)
Section 17, HEAT TRANSFER IN CRITICAL HEAT FLUX
By: Professor M.H. Saidi
Multiphase Flow Research Group
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Regions of heat tra
Two Phase Flows
(Section 5)
The Basic Model
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Homogeneous Model
Assumptions:
Velocity of gas and liquid phases are equal. Ug=Uf
Two Phase Flows
(Section 13)
SUBCOOLED BOILING HEAT TRANSFER
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Assignment
Exercise set 7
Chapter 4, Collier and Thome:
All Probl
Simulation of Two Phase Flows
(28-082)
Section 11, Convective boiling
By: Professor M.H. Saidi
Multiphase Flow Research Group
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Subcooled boiling
Dz
Two Phase Flows
(Section 16)
SATURATED BOILING HEAT TRANSFER
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Saturated forced convective boiling in a round tube
x(z) =
x(z) =
Two Phase Flows
(Section 8)
Empirical Treatments of Two Phase Flow
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Assignment
Exercise set 3
Chapter 2, Collier and Thome:
Pro
Two Phase Flows
(Section 14)
VOID FRACTION AND PRESSURE DROP IN
SUBCOOLED BOILING
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Void fraction in subcooled boiling
Highly su
Two Phase Flows
(Section 9)
Introduction to Pool and Convective Boiling
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Elementary Thermodynamics of Vapor/Liquid
Systems
Mult
Two Phase Flows
(Section 7)
Empirical Treatments of Two Phase Flow
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Drift Flux Model
Zuber and Findlay(1965)
Developed DFM mode
Two Phase Flows
(Section 15)
PRESSURE DROP IN SUBCOOLED BOILING
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Pressure drop in subcooled boiling
Slightly subcooled region:
Two Phase Flows
(28082)
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Outline of Course
v Introduction, Fundamental concepts and definition
v Principle Model of Two phase F
Two Phase Flows
(Section 4)
The Basic Model
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Energy Conservation
u k2
uk 2
uk 2
uk 2
[ k k ( k + )A z ] +W k ( k +
) z [W k ( k
Simulation of Two Phase Flows
(28-082)
Section 11, Convective boiling
By: Professor M.H. Saidi
Multiphase Flow Research Group
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Regions of heat transf
Two Phase Flows
(Section 6)
By: Prof. M. H. Saidi
Center of Excellence in Energy Conversion
School of Mechanical Engineering
Sharif University of Technology
Two Phase Flows
Homework set#2
Problems 5-9; Chapter 1, Collier
and Thome.
Due to next Tuesday
Met
Deformation modes
Not all deformations
are by tension.
A structure can have
forces applied in a
number of ways which
lead to several types of
deformation
how do we predict the
response of the material?
There are three basic
deformation modes
tension/compr
Corrosion and Degradation of
Materials
Why study corrosion?
http:/www.corrosiondoctors.org/Aircraft/Aloha.htm
Corrosion at the lap-joints
Materials selection
Rigorous inspection protocols
$ 4 to 5% of the Gross National Product (GNP)*
* H.H. Uhlig and
Magnetic Properties of
Materials
Magnetic Fields
Run current I, through cylindrical coil (solenoid)
Externally applied magnetic field results
Magnetic Field Strength, H (units A/m)
Magnetic field
strength H
current I
Origins of Magnetic Moments
Magnet
Electrical Properties of
Materials
Electronic Materials: Race for Faster Chips
Graph: Intel website: presentation towards the 65nm node , Yokohama Japan
Integrated Circuit (IC)
Moores Law: density of transitors (or performance) doubles
with every chip gen
Design against fracture
Design of materials
The fracture equation can be used as a
design criterion
K = KIC =f(g) acrit
where
size
KIC is a material property
is the applied stress
and acrit is an allowable crack
f(g), also denoted as Y, is a
geometry fa
Magnetic Properties of
Materials
Magnetic Fields
Run current I, through cylindrical coil (solenoid)
Externally applied magnetic field results
Magnetic Field Strength, H (units A/m)
Magnetic field
strength H
current I
Origins of Magnetic Moments
Magnet
Thermal Properties of
Materials
Thermal Properties & Heat Capacity
Response of a material to applied heat generally expands
Heat Capacity: measures the energy content of a material
Quantitative: The energy required to increase the
temperature of the mate
Processing and properties
Overview
We want
Mechanical properties
Which require
a specific
Structure
Which defines
the
Alloy composition
Processing
Which affects
the
Deformation - cold rolling
Ingot
Grains ~ large,
equiaxed (aspect
ratio ~ 1)
Dislocation