1.
A
( t w1 t w2 )
=
t
=
A
2.
t
= Aht =
R
1
R=
3.
04/25/12
q = ( t w1 t w 2 )
t
=
/
t
q = ht =
RA
1
RA =
h
Ah
= AT
4
1
4
= kA( t fi t fo )
W /( m K )
2
04/25/12
2
t fi
t fi > t fo
t fi
t fo
hi
ho
A, ,
04/25/12
1
Ahi
A
1
Aho
t fo
t fi t fo
A( t
Practice In Global Leadership
With
Alejandro Toledo
Former President of Peru
Dr. Alejandro Toledo was democratically elected President of Peru in 2001. Dr. Toledo is the first South
America President of indigenous descent to be democratically elected in f
Nu = 0.664 Re 1 2 Pr 1 3
hl
1. Nu =
2.
3.
l
1
tm = ( t + t w )
2
4.
04/25/12
Re < 5.0 105
1
3
u
u = a0 + a1 y + a 2 y + a 3 y
2
cfw_
a0 = 0, a1 =
y = 0
y =
3
u = 0
u u
2u
=0
2
y
u
0
y
3 u
u
a 2 = 0, a 3 = 2
,
2
2
u 3 y 1 y
=
u 2 2
04/25/12
3
1.
2.
04/25/12
1
1
1
2
3
4
5
04/25/12
ul
Re =
2
h = f ( u, , , c , , l )
1.
2.
3.
04/25/12
cfw_
1
2
3
cfw_
a.
a.
b.
b.
c.
c.
d.
d.
e.
e.
ab
c
3
2
u
= 0.99
u
04/25/
1.
x
= f ( Bi , , Fo )
0
2.
m
=
0 0 m
3.
04/25/12
1
5
5
main content
1.
1.
( definition of semi-infinite body )
definition
2.
2.
( distribution of temperature in semi-infinite
body in the unsteady heat transfer )
body
3.
3.
( example )
ex
1.
tw
qw
2.
t w1 t w( n +1)
q=
n
i
i =1 i
04/25/12
1
3.
4.
2l (t1 t 2 ) t1 t 2
ln ( r2 r1 )
=
=
R=
R
ln ( r2 r1 )
2l
04/25/12
2
5
5
04/25/12
3
04/25/12
4
1.
a. Ac P
b. l
1
c. >
h
04/25/12
5
q = 0
d.
dt
=0
dx
e.
1.
= kA( t fi t fo )
2.
t
= A n
n
t
q =
n
n
3.
t
t t t
c
= + + +
x x y y z z
04/25/12
1
1.
= 0
t = f ( x, y , z )
2.
04/25/12
t w =
tw
qw
qw =
t
= h( t w t f )
n w
2
1.
2.
3.
4.
5.
6.
A personal Ultrasound Simulator
2016
Nir shvalb, Ph.D.
Boaz Ben Moshe, Ph.D.
Ronny Tepper, Prof., MD
Team
Dr. Nir Shvalb and Dr. Boaz Ben Moshe Co-Head the
Kinematics and Computational Geometry Lab in Ariel
University. Dr. Shvalbs main scientific interest