The rate of or production is equivalent to the rate of combustion of the fuel:
|where||=||source of (kg/m -s), where or|
|=||mean limiting reaction rate of fuel (kg/m -s)|
|=||mass fraction of sulfur in the fuel|
The mean limiting reaction rate of fuel, , is calculated from the Magnussen combustion model, so the gaseous fuel SOx option is available only when the generalized finite-rate model is used.