Page 24 - Air pollution and greenhouse gases from basic concepts to engineering applications for air emission control

Nomenclature xxv

p(x) Probability function (–)
P Gas pressure (Pa)
P Potential energy (J)
P i Partial pressure of gas i in the gas phase above the liquid (Pa)
P p Penetration efficiency of particles (–)
P n Partial pressure of the oxidizer (Pa)
o 2
0
P v The original vapor pressure (Pa)
Pe Peclet number (–)
Modified Peclet number (–)
Pe m
q Charge carried by particle (C)
_ q Total sensible heat transfer rate (J)
Q Heat added to the system (J)
3
Q Volumetric gas flow rate (m /s)
3
Volumetric flow rate of exhaust air (m /s)
Q e
3
Air exits in the room at a volumetric flow rate (m /s)
Q e
3
Volumetric flow rate of internal air cleaning (m /s)
Q i
3
Volumetric flow rate of fresh air (m /s)
Q o
3
Volumetric flow rate of recirculating air (m /s)
Q r
3
Intake (supply) fresh air volumetric flow rate (m /s)
Q s
3
Sheath air flow rate (m /s)
Q sh
r Radial position (m)
3
Reaction rate (mol/m s)
r A
Radius of a droplet (m)
r s
Initial droplet diameter (m)
r s0
EGR percentage (–)
r EGR
r * Dimensionless distance from the center of the fiber (–)
Inner radius of annular space (m)
r 1
Outer radius of annular space (m)
r 2
R Interception parameter (m)
R Universal ideal gas constant, 8.314 (J/mol K)
R Overall resistance to mass transfer (m/s)
Liquid phase resistance to mass transfer (m/s)
R x
Gas phase resistance to mass transfer (m/s)
R y
R* Characteristic radius of two bodies in contact (m)
Re Reynolds number (–)
Particle Reynolds number (–)
Re p
Boundary layer Reynolds number at x (–)
Re x
RH Relative humidity (–)
S Internal source rate with respect to the air pollutant (Depends)
S Length of vortex finder of a cyclone (m)
_ s Pollutant production rate in the room (kg/s)
Length of the uniform single fiber (m)
s f
Particle shape factor (–)
S f
Atmosphere stability indicator (–)
s z