C	Mass concentration of aerosol, g/m3
Cpc	Mass concentration of contaminant particles, g/m3
Cps	Mass concentration of sorbent particles, g/m3
Cps min	Model-based minimum sorbent concentration satisfying the sorption-completeness criterion, g/m3
Dpc	Diameter of contaminant particle (Sauter mean diameter), m, µm
Dps	Diameter of sorbent particle (Sauter mean diameter), m, µm
D min	Particle diameter corresponding to minimum sedimentation rate, m, µm
E electr	Electric field strength, V/m
g	Gravitational acceleration (9.81), m/s2
H	Characteristic dimension of the room (height), m
kB	Boltzmann constant (1.38 × 10−23), J/K
kD	Diffusion coefficient of a particle, m2/s
kD 0	Empirical parameter in diffusion coefficient (3 × 10−15), N·m/K
mp	Mass of settled particles, g
mpc	Mass of settled contaminant particles, g
q	Electric charge of a particle, C
qpc	Electric charge of contaminant particle, C
qps	Electric charge of sorbent particle, C
q 0	Surface charge density coefficient (2, µC/m2)
r	Distance between particle centers, m
R	Gas constant, J/(mol·K)
t	Time, s
tcapt	Characteristic capture time (1/(K⋅Cps)), s
tdept	Characteristic sedimentation time (H/us), s
T	Absolute temperature, K
us	Stokes settling velocity, m/s
U	Relative velocity between PSs and PCs, m/s
β	Wall deposition coefficient, 1/m
β0	Empirical parameter in wall deposition (0.025), 1/m
γ	Overall sedimentation rate constant, 1/s
ε0	Vacuum permittivity (8.85 × 10−12), F/m
ε	Relative dielectric permittivity of particle
η	Overall capture efficiency
ηdif	Capture efficiency due to Brownian diffusion
ηelec	Capture efficiency due to electrostatic interaction
ηiner	Capture efficiency due to inertial impaction
ηinter	Capture efficiency due to interception
λ	Mean free path of air molecules (≈68), nm
μ	Dynamic viscosity of air, Pa·s
ρp	Particle density, kg/m3
τfull	Dimensionless criterion for complete sorption
Dimensionless numbers
Kn	Knudsen number (λ/(Dp/2))
NE	Electrostatic interaction parameter
Pe	Péclet number (Equation (11))
Stk	Stokes number (Equation (9))
Subscripts
c	Contaminant (PC—contaminant particle)
s	Sorbent (PS—sorbent particle)
p	Particle (general)
0	Initial condition (t = 0)