
13-1
13.1 Introduction
is chapter deals with fundamentals of thermal methods for sensing and measuring mass uid ows.
e ow can be dened as the motion of a continuum (uid) in a closed structure (channel, orice), and
it is th
e
me
asured
ob
ject
. e as
sociated
ph
ysical
qu
antity
se
nsed
is th
e
ma
ss
u
x
th
at
o
ws
th
rough
a
un
it
c
ross
s
ection
.
e
e
quation
f
or
t
he
v
olume
ow
r
ate
Φ
v
is given by
Φ
v
= =
dV
dt
vA
(13.1)
where
V is the volume through in the time t
v is the average velocity over the cross-sectional area A of the channel
with the relation between the volume V, mass M, and the density of uid ρ
V
M
=
ρ
(13.2)
13
Thermal Sensors: Flow
13.1 Introduc ...