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Flow Distributed Oscillations

Flow Distributed Oscillations. Flow Distributed Oscillations. patterns without differential diffusion or flow Very simple reactor configuration: plug-flow tubular reactor fed from CSTR reaction run under conditions so it is oscillatory in batch, but steady-state in CSTR. CSTR.

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Flow Distributed Oscillations

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  1. Flow Distributed Oscillations

  2. Flow Distributed Oscillations • patterns without differential diffusion or flow • Very simple reactor configuration: plug-flow tubular reactor fed from CSTR • reaction run under conditions so it is oscillatory in batch, but steady-state in CSTR CSTR

  3. Simple explanation • CSTR ensures each “droplet” leaves with same “phase” • Oscillations occur in each droplet at same time after leaving CSTR and, hence, at same place in PFR

  4. Explains: need for “oscillatory batch” reaction stationary pattern wavelength = velocity ´ oscill period • Doesn’t explain critical flow velocity other responses observed

  5. Experiment

  6. CDIMA reaction chlorine dioxide – iodine - malonic acid reaction: Lengyel-Epstein model (1) MA + I2 IMA + I + H+ (2) ClO2 + IClO2 + ½ I2 (3) ClO2 + 4 I + 4 H+ Cl + 2 I2

  7. Dimensionless equations u = [I-], v = [ClO2-]: uniform steady-state is a solution of these equations, but is it stable?

  8. J. Bamforth et al., PCCP, 2000, 2, 4013

  9. absolute and convective instability

  10. stationary FDO pattern Relevance to somatogenesis?

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