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Temporal Order pp 116-121 | Cite as

Periodic Perturbation of the BZ-Reaction in a CSTR: Chemical Resonance, Entrainment and Quasi-Periodic Behavior

  • F. Buchholz
  • A. Freund
  • F. W. Schneider
Part of the Springer Series in Synergetics book series (SSSYN, volume 29)

Abstract

Chemical oscillations may occur in open non-linear kinetic mechanisms far from chemical equilibrium. They may show a variety of interesting phenomena when they are periodically perturbed by an external source. These phenomena include chemical resonance, entrainment, quasi-periodic behavior and even chaotic responses. While a number of theoretical discussions have been given on the subject of periodic perturbations of oscillating isothermal chemical reactions [1–10], there exist only few experimental verifications of some of these phenomena [11–15] in chemical systems. Here we report the results of initial experiments on the periodic perturbation of the Belousov-Zhabotinsky (BZ) reaction in an isothermal continuous flow stirred tank reactor (CSTR). We describe two sets of experiments. In the first set, the BZ reaction is altered to be a damped oscillator (in the presence of in-flowing KBr) and, in the second part, it behaves as a stable limit cycle. Both instances are investigated with the same experimental technique. A periodic perturbation is applied to the reacting system in the form of sinusoidal flow-rate changes as effected by a regulated high-precision syringe pump. We observe a single broad resonance curve for the damped BZ-reaction. For the undamped BZ-reaction, several sharp resonances in various entrainment bands, as well as quasiperiodic behavior are observed. In the transition region between fundamental entrainment and quasi-periodic response, the Fourier spectra slowly change with time.

Keywords

Fourier Spectrum Forced Response Malonic Acid Fourier Component Resonance Curve 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • F. Buchholz
    • 1
  • A. Freund
    • 1
  • F. W. Schneider
    • 1
  1. 1.Institut für Physikalische ChemieUniversität WürzburgWürzburgFed. Rep. of Germany

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