Modeling Chemical Reactions Using Bond Graphs
Keywords
- Chemical reactions
- Modelica
- Bond graphs
Abstract
This article offers a general methodology for modeling basic chemical
reactions and carries forward a series of papers on modeling
thermodynamic behavior using true rather than pseudo-bond graphs. In
order to make processes of heating and expansion within the mixture
visible, our approach does not deal with one overall volume and the
overall entropy -as would be normal for classical chemistry- but rather
with separated entities, one for each compound. Furthermore,
assumptions of quasistationary or equilibrium conditions are minimized
to ensure the largest possible degree of generality in the conclusions
reached.
It will be shown, that chemical reactions can be modeled as
transformative behavior, which makes their external behavior linear and
therefore allows for superposing several chemical reactions.
While the mass flows (respectively molar flows) are assumed to be
determined directly from Arrhenius' equation and the underlying
stoichiometry, the determination of entropy and volume flow processes
needed a more extensive discussion.
A bondgrapher's Modelica model of the HBr-synthesis based on the
assumption of ideal gas serves as an example of the presented theory of
chemical reaction dynamics.
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Last modified: September 26, 2012 -- © François Cellier