Parameter

Description

Outlet mixture density (kg/m³)

Concentrated pressure losses at pipe entrance

Concentrated pressure losses at pipe outlet

Total mass flow (kg/s)

A

Flow area (m²)

D

Pipe diameter (m)

P

Pressure (Pa)

G

gravity acceleration

L

channel length

Z_B

boiling length

the liquid density

Two-phase friction factor

f

Single-phase friction factor

Phase change number

Subcooling number

Thermodynamic quality

v_fg

Difference between the specific gas and liquid volumes v_g ? v_f

Friction factor number

Mass flow rate fraction of channel i

Mass flow rate fraction of channel 1, 2