9814

Chemical Reactions Described by the Lorenz Equations

This Demonstration analyzes the behavior of a chemical reaction scheme that is described by the Lorenz equations:
,
,
.
Parameters that lead to interesting behavior are ; the strange attractor that evolves from these equations spans both positive and negative values of and . If we interpret these symbols as representing concentrations of chemical species, they cannot be negative; a shift of the and axes can give new variables that are always positive [1]. Thus if we choose , , with , the equations describing the system become
,
,
,
where , , and represent concentrations of chemical species. Using the values for the constants given above, the equations are
,
,
.
The reactions required to give the Lorenz equations are shown in section (1.7) of [1]. You can vary the time and the initial values of the species to see the evolution of the system. There is an unstable steady state at and an unstable fixed point at .

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Reference
[1] D. Poland, "Cooperative Catalysis and Chemical Chaos: A Chemical Model for the Lorenz Equations," Physica D 65(1–2), 1993 pp. 86–99. doi:10.1016/0167-2789(93)90006-M.
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