TSI Instruments SMPS 3938 User Manual

B-12 Electrostatic Classifier Model 3082 and SMPS Spectrometer Model 3938
where:
n = number of elementary charges on the particle
e = elementary charge (1.6022 x 10
–19
A·s)
C = Cunningham slip correction













Kn
expKn1C


 = 1.165,  = 0.483,  = 0.997 (Kim et al., 2005)
Kn = Knudsen Number
p
D
2
Kn



= gas mean free path























T/S1
T/S1
T
T
P
P
r
r
r
r

S = Sutherland constant = 110.4 K
T = temperature [K]
P = pressure
η = dynamic gas viscosity (kg·m
-1
·s
-1
)
2
3
r
r
r
T
T
ST
ST
















 
D
p
= particle diameter
Index r in above equations denotes gas reference values. The following set
of reference values (from ISO 15900, taken from Kim et al., 2005) is used
as default reference values for air in the Electrostatic Classifier Model 3082
and the Aerosol Instrument Manager Software Model 3938:
Reference Temperature T
r
= 296.15 K
Reference Pressure P
r
= 101.3 kPa
Reference dynamic viscosity 
r
= 1.83245·10
-5
kg·m
-1
·s
-1
Reference mean free path 
r
= 6.730·10
-8
m
Note: In above equations, the gas mean free path and gas viscosity
parameters are based on reference values for 
r
, 
r
, S
r
, T
r
and P
r
. It is
important to use consistent values (that is, you may use different values for

r
, 
r
, S
r
, T
r
and P
r
to calculate  than to calculate  as long as the values
are consistent for each equation). Values for common gases can be found
in Radar (1990). An explanation of the gas equations can be found in
Willeke & Baron (1993).

TSI Instruments SMPS 3938 Specifications

General

Brand	TSI Instruments
Model	SMPS 3938
Category	Laboratory Equipment
Language	English