An Experimental and Theoretical £ Investigation of Annular Steam ...

- 26 -
with the line m_ = 0 represents the flow rate of the film if no
waves were present. This flow rate is denoted m- .
The slope s is related to x , the steam quality in the
C
C f S
core near the wall:
When no slip is assumed between the gas (steam) and the droplets,
the void fraction in the core near the wall is given by
a c,s * T$*
c
where
(3 ' 10)
p' = ~ p l
. (3.11)
g
Under the no-slip assumption, the mean void fraction in the core
can be calculated from
°c,m =
m e ?m+p J x '
(3 - 12)
where m (kg/s) is the flow rate of the entrained liquid:
m—m
g
—m-
r
m^
e
=
= m(l-x-m,/m) . (3.13)
In the case of an annular geometry, ro f denotes the total film
flow rate:
n f ~ m fl +m f2 (3.14)
where m