METE 305
TRANSPORT PHENOMENA
WEEK 2
Dr. BLGE MER
Mechanism of Heat Transfer
DO NOT confuse or interchange the meanings of Thermal Energy, Temperature and
Heat Transfer
Quantity
Meaning
Symbol
Units
Thermal Energy+
Energy associated with
microscopic behavi
Critical Resolved Shear Stress
Slip occurs when the shearing stress on the slip plane in the slip
direction reaches a critical resolved shear stress, c
.
The area A/cos.
The force Pcos.
The critical resolved shear stress
when= = 45 TheR is maximum
.
when=
Solving system of linear equations
One of the most frequently recurring practical problems in many elds of
scientic and engineering study, is that of solving a system of linear equations. The equation,
b=a1x1+a2x2+.+anxn
which expresses b in terms of the
METE 305
TRANSPORT PHENOMENA
LECTURE 2
Dr. BLGE MER
FRICTION
VISCOSITY & INTERNAL FRICTION
DIMENSIONAL ANALYSIS & REYNOLDS NUMBER
PIPES & DUCTS
TYPES OF FLOW (Laminar vs. Turbulent Flow) Critical Reynolds
Number
PIPE FITTINGS & BENDS (minor losses)
45:35 FuhSAS an .555 mm :03?
a
ne cnmlm+n+mm
3583 ne .5
go: o coup05w o: mm 0.55 533 E .5558 a E .25 32 a nouosvuoo
no: 8m .ommng 835505 5 Ema? cumnonu mo mag 06 2.5 mm SunE.
.3: E 5325:. REEF S 5603? emuEnsu mo 3: 05. as 088 05 2a 533
m I. n EEO ma a VHS
Strengthening Mechanisms
Strengthening techniques rely on restricting dislocation motion to render a
material harder and stronger.
Polycrystals
We have already seen single crystal behaviour. With the exception of solid
state devices, single crytal are rar
Consider that you have a crystal with bcc a=2.87 A and shear modulus of
G=80.2 GPa. This crystal in well annealed conditon has a dislocation density of 1
x10 7 /cm2. The crystal is now cold worked whereby the dislocation density is
increased to 1x1011/cm2
Strengthening Mechanisms
Interaction of Strengthening Mechanism
S: Solid solution Hardening
D: Strain(Dislocation) Hardening
B :Boundary Hardening
P : Particle Hardening
Considering combination of two
PP (two sets of particles of different strength)
=10 o
Strengthening Mechanisms
Strengthening techniques rely on restricting dislocation motion to render a
material harder and stronger.
Strengthening from fine particles
Precipitation Strengthening
Alloys processed to form first
supersaturated solid solution a
METE 305 TRANSPORT PHENOMENA (FALL 2015)
Homework 2
(Due Date: 18/11/2015)
1. Calculate the air velocity (m/min) and the flow rate (m3/min, STP) in a 12 cm hole with
equilateral triangle cross-section through a 50 cm wall into a furnace chamber at a level
1/13/2011
The Atomic Structures of Materials
Alessandro Anzalone, Ph.D
Hillsborough Community College, Brandon Campus
Agenda
1.
2.
3.
4.
5.
6.
7.
8.
9.
Structure and Classification of Atoms
The Atom
Periodic Table
Atomic Bonding
Metals
Solidification of M
TRANSPORT PHENOMENA
Outline
CHAPTER 1 MOMENTUM TRANSFER (FLUID FLOW)
1.1. Introduction
1.2. Energy Balances
1.2.1. System of Units
1.2.2. Kinds of Energy
1.2.3. The Total Energy Balance
1.2.4. The Mechanical Energy Balance
1.3. Friction
1.3.1. Viscosity;