functionKnudsenNumber
Returns Knudsen number
Extends from Modelica.Icons.Function (Icon for functions).
Information
Defined to be the ratio of the length scale between interactions divied by the characteristic length scale of the problem
- Kn = L_ms/L_char
If Kn is not << 1 then continuum theory breaks down and the calculus assumption to derive dT/dx as the lim dx -> 0 is not valid.
This limit may be reached in micro and nano-scale systems where L_char becomes small as well as in problems involving rarefied gas where L+ms becomes large.
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Length | L_ms | Distance between energy carrier interactions | |
| SI.Length | L_char | Length scale that characterizes the problem |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| Units.NonDim | Kn | Jakob number |