June 6, 2022 at 8:33 amFAQParticipant
I have tried to reproduce this and am getting a much larger number. After calculating the heat of reaction for C+O2 -> CO2, I am getting a significantly different value (about 9.24e7 J/kg) than the default.
Answer: The Fluent char material is c
. If this is used, along with the reference enthalpy numbers for CO2 and O2, the calculated burnout heat is consistent with the default value. Note that there are a number of forms of solid carbon. Graphite is the naturally occurring one, with a reference enthalpy of 0 J/kg. (Diamond is another.) Char is somewhat different again, and the reference enthalpy is the one that is tuned to give the observed heat of burnout for a representative coal. Some coals may be different in this respect, so we allow a change in the heat of burnout – essentially acknowledging that the coal is of a different formation than the average.
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