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k
Coefficient for the sharpness of cut (–)
COR
Coefficient of restitution (–)
v
Velocity (m s
−1 )
η
Viscosity (Pa s)
ρ
Density (kg m
−3 )
H
Particle layer height (cm)
τ
Characteristic particle relaxation time (s)
τ*
Particle cloud relaxation time (s)
˙
V
Carrier gas volume flow rate (m
3 s
−1 )
R
Wheel radius (m)
h
Height of the openings in the deflector wheel (m)
U
Circumference (m)
2D
2D Sphericity (–)
SEM
Scanning electron microscope
σ
Standard deviation (depends on related variable)
E
Kinetic energy (J)
JKR
Johnson-Kendall-Roberts
p
Pressure (Pa)
E*
Average Young’s modulus (Pa)
υ
Poisson ratio (–)
Angle related to the deflector wheel blade (°)
L
Impaction length (m)
f
Revolution rate (s
−1 ), fine material fraction (–)
c D
Drag coefficient (–)
Re
Particle Reynolds number (–)
κ
Sharpness of cut (–)
F
Force (N)
c
Coarse material fraction (–)
Q
Distribution sum function (–)
a
“Dead flow” parameter (–)
α, β
Measure of selectivity (–)
Dimensionless acceleration number (–)
A
Amplitude (m)
ω
Angular velocity (° s
−1 )
g
Gravitational constant (m s
−2 )
q
Density distribution (m
−1 )
˙
m
Massflow rate (kg s
−1 )
K V
Throwing coefficient (–)
Indices
p
Particle