TY - JOUR

T1 - Role of the reagents consumption in the chaotic dynamics of the Belousov–Zhabotinsky oscillator in closed unstirred reactors

AU - Turco Liveri, Maria Liria

AU - Antonio Budroni, Marcello

AU - Rossi, Federico

AU - Marchettini, Nadia

AU - Masia, Marco

AU - Rustici, Mauro

PY - 2010

Y1 - 2010

N2 - Chemical oscillations generated by the Belousov–Zhabotinsky reaction in batch unstirredreactors, show a characteristic chaotic transient in their dynamical regime, which is generallyfound between two periodic regions. Chemical chaos starts and finishes by following a direct andan inverse Ruelle–Takens–Newhouse scenario, respectively. In previous works we showed, bothexperimentally and theoretically, that the complex oscillations are generated by the couplingamong the nonlinear kinetics and the transport phenomena, the latter due to concentration anddensity gradients. In particular, convection was found to play a fundamental role. In this paper,we develop a reaction–diffusion–convection model to explore the influence of the reagentsconsumption (BrO 3 in particular) in the inverse transition from chaos to periodicity.We demonstrated that, on the route towards thermodynamic equilibrium, the reagentsconcentration directly modulates the strength of the coupling between chemical kinetics andmass transport phenomena. An effective sequential decoupling (reaction–diffusion–convection -reaction–diffusion - reaction) takes place upon the reagents consumption and this is at the basisof the transition from chaos to periodicity

AB - Chemical oscillations generated by the Belousov–Zhabotinsky reaction in batch unstirredreactors, show a characteristic chaotic transient in their dynamical regime, which is generallyfound between two periodic regions. Chemical chaos starts and finishes by following a direct andan inverse Ruelle–Takens–Newhouse scenario, respectively. In previous works we showed, bothexperimentally and theoretically, that the complex oscillations are generated by the couplingamong the nonlinear kinetics and the transport phenomena, the latter due to concentration anddensity gradients. In particular, convection was found to play a fundamental role. In this paper,we develop a reaction–diffusion–convection model to explore the influence of the reagentsconsumption (BrO 3 in particular) in the inverse transition from chaos to periodicity.We demonstrated that, on the route towards thermodynamic equilibrium, the reagentsconcentration directly modulates the strength of the coupling between chemical kinetics andmass transport phenomena. An effective sequential decoupling (reaction–diffusion–convection -reaction–diffusion - reaction) takes place upon the reagents consumption and this is at the basisof the transition from chaos to periodicity

KW - Belousov–Zhabotinsky reaction

KW - chaotic transient

KW - reagents consumption

KW - Belousov–Zhabotinsky reaction

KW - chaotic transient

KW - reagents consumption

UR - http://hdl.handle.net/10447/50889

M3 - Article

VL - 12

SP - 11062

EP - 11069

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

ER -