Exponential_Vapor_Cooling

Syntax

Bc Lumped_Flux For Energy ([{of} SpeciesName] | [{in} MaterialPhaseName] | [{ls} {a | b | c}]) {@ | at | for | on | over} Mesh Extent Name ([Touching TouchingMeshExtent] | [Opposing OpposingMeshExtent]) = Exponential_Vapor_Cooling [Using Data Specification Data Spec Name] ([Power_Output = power_output] | [Flux_Output = flux_output] | [Toggle = toggle] | Tboil = tboil | L = l | Pa = pa | Mw = mw | Alpha = alpha | [Tl = tl] | [Th = th])

Summary

Exponential vapor cooling energy flux

Description

Flux is given by:

$F = P_a L \alpha \exp\left(\frac{L}{R}\left(\frac{1}{T_{boil}}-\frac{1}{T}\right)\right) \sqrt{\frac{1}{2 \pi R T}}$

where $R$ is the specific gas constant ( $\bar{R}$ /MW). For $T$ less than $T_L$ , zero flux is applied. For $T$ between $T_L$ and $T_H$ , a 3rd order smoothing polynomial is used to provide continuity of values and derivatives between 0 and the expression given above. For $T$ greater than $T_H$ , the above expression is used. If not provided, $T_L$ and $T_H$ are set to 10% below and above $T_{Boil}$ , respectively.

The following options are present in most boundary conditions/sources. The meaning of each option is as follows:

Power_Output: If specified, the total (integrated) power of the given BC/Src is calculated and stored into the global variable name specified as the power_output argument.
Flux_Output: If specified, the average flux of the given BC/Src is calculated and stored into the global variable name specified as the flux_output argument.
Toggle: If given, specifies which toggle block controls whether this BC is active or not.

Parameter	Value	Default
{of}	{of \| species \| subindex}	–
SpeciesName	string	–
{in}	{in \| material_phase}	–
MaterialPhaseName	string	–
{ls}	{levelset_phase \| ls}	–
Mesh Extent Name	string	–
TouchingMeshExtent	string	–
OpposingMeshExtent	string	–
Data Spec Name	string	–
power_output	“string”	–
flux_output	“string”	–
toggle	“string”	–
tboil	real	–
l	real	–
pa	real	–
mw	real	–
alpha	real	–
tl	real	-1
th	real	-1