Jökull - 01.12.1966, Side 35

jOAY/Y£SS SfíACTtos/
Pc
4.2
4
x°-4
(3)
Pc
0.96
(Pipe dia g 1 in.) (4)
These correlations are shown in Fig. 5 and
the extent to which James’ (1955) restdts con-
form to them.
Table I gives data obtained frorn wells at
Hveragerdi and includes the mass flow as esti-
mated bv the separation equipment described
above. It wdl be observed from Fig. 5 that these
results do not correlate well with either equa-
tions (3) or (4).
In the paper quoted above, Isbin, Moy and
Cruz propose a much more sophisticated ap-
proach to the problem of predicting mass flow.
Proceeding from a theory originally proposed
by Linning (1952/3), they assumed that the
flow was annular with no core entrainment.
'ölfl.'i
f OfíTf) FO.OM R. JfíHES, /$62]
Fig. 4. Variation of Dryness Fraction
with Critical Pressure.
2 3 4 S ó 7 8
OSYNESS FXfíCTIoM , X
L/O/e fí /S SOUfíTloM (4-)
ÍW£ 8 /S EQUfír.o.fí (31
• 3 /<V P/P£, 60 psífí. \ fí/eu Z£f)Lfí//D
+ (o /N P/PE, pc - 4° psía. ( /?. Tfí/ffíS, /462
O 8 /M P/Pe, -P = 20 Ps/a. J
A Sfí/ZveLL, /fS7
X /CELfíND
Fig. 5. Correlation for Homogeneous Flow.
Thus, considering Fig. 6 momentum cont.inuity
requires that
d(WgVg + WfVf) = - Adp (5)
For the vapour, mass continuity requires
xGv„
V,=
R_
Similarly, for the liquid
V,
(1 — x)Gvf
1 — R_
(6)
(7)
Substitution of equations (6) and (7) in (5),
differentiating under a condition of constant
JÖKULL 189