multivariate production systems optimization - Stanford University
multivariate production systems optimization - Stanford University
multivariate production systems optimization - Stanford University
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• The term NGV NL 0.38<br />
ND 2.14<br />
is used with the second graph to obtain ψ, where ψ is a<br />
second correlating parameter.<br />
•<br />
The term NLV<br />
to obtain the term<br />
P 0.1 CNL<br />
0.575<br />
NGV<br />
PSC ND<br />
25<br />
is used in association with the third graph<br />
HL<br />
ψ which yields the liquid holdup.<br />
These graphs have been tabulated and are presented in Table 3.1.<br />
Table 3.1: Correlating Functions of Hagedorn and Brown (1965).<br />
GRAPH 1 GRAPH 2 GRAPH 3<br />
N L CN L NGV NL 0.38<br />
ND 2.14<br />
ψ NLV P 0.1 CNL<br />
0.575<br />
NGV<br />
PSC ND<br />
.002 .0019 .010 1.00 0.2 .04<br />
.005 .0022 .020 1.10 0.5 .09<br />
.010 .0024 .025 1.23 1. .15<br />
.020 .0028 .030 1.40 2. .18<br />
.030 .0033 .035 1.53 5. .25<br />
.060 .0047 .040 1.60 10. .34<br />
.100 .0064 .045 1.65 20. .44<br />
.150 .0080 .050 1.68 50. .65<br />
.200 .0090 .060 1.74 100. .82<br />
.400 .0115 .070 1.78 200. .92<br />
--- --- .080 1.80 300. .96<br />
--- --- .090 1.83 1000. 1.00<br />
Having obtained the correlated value for liquid holdup, the pressure gradient due to<br />
hydrostatic head is simply<br />
dP g<br />
=<br />
dZ HH gC ρL HL + ρG HG = g<br />
gC ρS<br />
HL<br />
ψ<br />
(3.30)<br />
In determining the friction component, Hagedorn and Brown (1965) elected to<br />
correlate a two-phase friction factor with a two-phase Reynold's number using the standard<br />
Moody diagram. The two-phase Reynold's number, as defined by Hagedorn and Brown<br />
(1965), is