Page 197 - Standard Handbook Of Petroleum & Natural Gas Engineering
P. 197
Flow +
K? - Rqnulda Niimkr bared OII d,
Figure 2-24. Flow coefficient for nozzles and orifices (from Brown, p. 226, Fig. 3-19).
Thus there is a critical pressure ratio beyond which the flow at the throat is always
sonic. This is termed critical flow.
= ( -L)k''k-') (2-67)
