Related Resources: material science

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

​

 

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:

Critical Pressure Ratio Equation:

Nozzle Outlet Velocity Equation:

Nozzle Outlet Area Equation:

where:

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

r = pressure ratio = p₁ / p₂

r_c = critical pressure ratio

A₂ = outlet area (m²)
A_c = 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