ux, uy, uz	velocity components in the X, Y, Z directions (m/s)
t	fluid flow time (s)
ρ	fluid density (kg/m3)
${\tau }_{xx}$, ${\tau }_{xy}$, ${\tau }_{xz}$	viscous stress component on the micro-element surface (Pa)
fx, fy, fz	unit mass force in the X, Y, Z directions (m/s2)
$\overrightarrow{u}$	velocity of working fluid (m/s)
${\overrightarrow{u}}_p$	velocity of particles produced by discharging (m/s)
${\rho }_p{}_{}$	density of the processed products (kg/m3)
μ	dynamic viscosity of working fluid (Pa·s)
ρ	fluid density (kg/m3)
dp	diameter of particles produced by discharging (m)
Re	Reynolds number
CD	drag coefficient
$\overrightarrow{g}$	gravitational acceleration (m/s2)
F	additional forces (N)