1. HYDRAULIC AND PNEUMATIC CLASSIFICATION

2. Main parameter - velocity of settling of particles
Fc + Fo + Fb = 0
Fc - gravity force of particle in liquid
Fo - resistance force
Fb - inertia force

3. Fc = Vd  g
Fo = 0,5  c v2 A
Fb = Vd (d + ad c) dv/dt
A – area of projection of the maximum cross section of
the falling object perpendicularly to its movement, m2
Vd – particle volume, m3
ad – acceleration coefficient (dimensionless) (0,5 for
spheres, 0.75 for discs)
t – time, s
g – acceleration due to gravity, m/s2
-friction coefficient
d - particle diameter
- particle density in medium
c - medium density
d - particle density
v - velocity of settling
Terminal settling velocity 

4. or
4/3Ar =  Re2
because
c - viscosity of liquid

6. spherical particles
Stokes range: Re < 0.2, from ~ 0.01mm to ~0.1mm
Allen’s range: 0.2<Re < 5x102, from ~0.1mm to ~1mm
Newton’s range: 5x102 <Re < 3x105, above ~1mm
-particle density in water, -viscosity, d-particle diameter, g-gravity constant, k - a constant, c -liquid density

7. Modes of hydraulic classication:
- stationary
- horizontal
- vertical
- pulsation
- spiral

8. cone classifier

9. elutriator

10. pocket classifier

11. plunger jig

12. hydrocyclone