Page 537 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

Flow of Fluids 491

100
50

20
10

5
NVL
2

1

.S

.2

0.1
0

Figure 6-60. Region of occurrence of different flow regimes [23].

Any consistent units system may be used, e.g.,

English Metric
pL (liquid density) slugdfP kg/mg
d (diameter of pipe) ft m
Q (liquid surface tension) dynlcm dydcm
(liquid velocity) Cp CP

Equations contain a ''g" term that was included into the mist conversion factors
A, B and C.

English Metric
A 1.938 3.193
6 120.9 99.03
C 0.1 573 0.3146

At high liquid rates the pressure gradient varied significantly with the gas
rate. The various flow regions were divided into three main regions depending
on the amount of gas present.