Nozzle Coefficient Data

The following table lists the empirical quadratic coefficients \(a\), \(b\), and \(c\) for each of the 12 supported nozzle types. Select the row whose index matches the nozzle_type field of compressed_air_reduction::PressureMethodData.

Index	Nozzle Type	\(a\) \([\unit{\scfm\per\psi\squared}]\)	\(b\) \([\unit{\scfm\per\psi}]\)	\(c\) \([\unit{\scfm}]\)
0	1.0 mm nozzle	\(-2.200 \times 10^{-7}\)	0.018893	0.268476
1	1.5 mm nozzle	\(-2.800 \times 10^{-5}\)	0.038377	1.061905
2	1/4" pipe, open	\f$-7.600 \times 10^{-5}\f$	1.537424	14.300000
3	1/4" tubing	\f$-2.200 \times 10^{-5}\f$	0.345931	5.780952
4	1/8" pipe, open	\f$6.820 \times 10^{-4}\f$	0.643182	13.833330
5	1/8" tubing	\f$5.410 \times 10^{-6}\f$	0.228851	2.968095
6	2.0 mm nozzle	\(-2.100 \times 10^{-6}\)	0.075463	1.089857
7	2.5 mm nozzle	\(-2.800 \times 10^{-5}\)	0.148710	1.841905
8	3/8" pipe, open	\f$2.652 \times 10^{-3}\f$	2.250152	46.566670
9	3/8" tubing	\f$7.470 \times 10^{-4}\f$	0.842056	15.957140
10	5/16" tubing	\f$4.110 \times 10^{-4}\f$	0.560649	10.161900
11	Air Knife	\(9.350 \times 10^{-4}\)	0.130792	4.429524

See also

Orifice/Pressure Method Flow Rate Formula for the formula that uses these coefficients.