Convergent Divergent Nozzle Flow Velocity and Area Equation and Calculator

Hydraulic & Pneumatics
Fluids Design and Engineering Data

Convergent-Divergent Nozzle Flow Velocity and Area Equation and Calculator

Convergent-Divergent Nozzle‚Äč

 

Throat Velocity Equation:

Throat Velocity Equation

Values of the index n and the critical pressure ratio r, for different fluids are given in the table below.

Throat Area Equation:

Throat Area Equation

Critical Pressure Ratio Equation:

Throat Area Equation

Nozzle Outlet Velocity Equation:

Nozzle Outlet Velocity Equation

Nozzle Outlet Area Equation:

Nozzle Outlet Area Equation

where:

p1 = Inlet pressure (N / m2, Pa)
v1 = Inlet specific volume (m3)
vc = Outlet specific volume (m3)
C2 = Outlet velocity (m/sec)
Cc = Throat velocity (m/sec)

r = pressure ratio = p1 / p2

rc = critical pressure ratio

A2 = outlet area (m2)
Ac = throat area (m2)
n = index of expansion
m = mass flow rate (kg/m2)

Fluid
n
rc
Air (n = γ)
1.40
0.528
Initially dry saturated steam

1.135

0.577
Initially superheated steam
1.30
0.546
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