Disabling the contact surface solids may cause the calculation to fail.
Warning Message:
The message is found in the summary window
Disabling the contact surface solids may cause the calculation to fail.
The Error message below is an indication of this.
*** ERROR: A CONSTITUENT
IN THE INFLOW SPECIES XXXX
(MATERIAL BALANCE TYPE NNN)
IS NOT REFLECTED
IN ANY OUTFLOW SPECIES.
Analysis:
The error message is cryptic because we don’t know exactly which species is in error. We found that with corrosion rates if a contact surface solid was excluded from the calculation then the rates calculation was in error. The problem is that we don’t know which solid phase will form until we calculate the case. So if you turn off any solids we display the message.
The most likely class of species will be Fe containing solids. For example, you cannot have iron redox with elemental iron if you remove the iron (Fe) solid. We can trap for this. The problem becomes in the passivating films such as iron oxides or hydroxides. We don’t know if they will form at the start of the calculation. If you remove them and they would not have formed anyway then the rates calculation is correct. If you remove them and they would have formed then the rates calculation would be incorrect.
It is more complicated when using contact surface metals such as stainless steels. With stainless steels the passivating films are oxides and hydroxides of chrome, manganese, molybdenum, nickel, etc. Since the list of potential solids are may we display the generic warning.
Until we figure out a method of determining which solids are likely to form before the calculation starts we will have to warn the customer about removing solids in rates calculations.
