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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
13-11Thermal Sensors
Table 13.4 shows a collection of formulae for calculating the Nusselt number. e uid properties (kine-
matic
vi
scosity
ν an
d
Pr
andtl
nu
mber
Pr
)
sh
ould
be ch
osen
at th
e
av
erage
te
mperature
T
av
between the
he
ater
t
emperature
T + T a
nd
t
he
uid
t
emperature
T:
T T
T
av
= +
2
(13.18)
In
th
e
ca
se
of na
tural
co
nvection,
th
e
Nu
sselt
nu
mber
de
pends
on th
e
Gr
ashof
nu
mber
Gr
,
wh
ich
de
scribes
t
he
i
nuence
o
f
b
uoyancy
f
orces:
Gr =
g L T
β
3
2
v
(13.19)
where
g
i
s
t
he
a
cceleration
d
ue
to t
he
g
ravity
(
9
.81 m s
−2
)
β
t
he
t
hermal
e
xpansion
c
oecient
o
f
t
he
uid
T
i
s
t
he
t
emperature
d
ierence
b
etween
t
he
h
ot
uid
a
nd
t
he
a
mbient
e
a
verage
N
usselt
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Publisher Resources

ISBN: 9781439848913