Pattern analysis of viscous oscillation in a shear flow induced by an exothermic reaction

Satoko Fujioka, Hideyuki Matsumoto, Chiaki Kuroda

Research output: Contribution to journalArticle

Abstract

An investigation is made of oscillatory phenomenon induced by an exothermic reaction. This oscillatory phenomenon occurs in a very thin mixing layer between two miscible and reacting fluids. A qualitative model based on the interaction among reaction, molecular momentum transfer, molecular heat transfer, molecular mass transfer and forced convective transfer was proposed by Kuroda and Ogawa [1994. Nonlinear waves in a shear flow with a diffusive exothermic reaction and its qualitative reasoning. Chem. Eng. Sci. 49(16), 2699-2708]. It is experimentally shown in the present study that the oscillatory patterns change in the flow direction. In the upstream area where oscillatory patterns are nearly straight stripes, effects of viscosity on those stripes are investigated. In the downstream area where stripes are wavy and disordered, fractal analysis is introduced to investigate the relationship between the transition of oscillatory flow patterns and process factors, i.e. the viscosity ratio, the entire viscosity, flow rate and the flow rate ratio. Fractal analysis is also applied to temperature oscillation, and it is confirmed that the characteristic patterns of oscillation become obscure as the entire viscosity increases. The entire viscosity is an important factor for controlling both oscillatory patterns of flow and temperature in this reactive flow system.

Original languageEnglish
Pages (from-to)163-174
Number of pages12
JournalFluid Dynamics Research
Volume40
Issue number3
DOIs
Publication statusPublished - 2008 Mar 1
Externally publishedYes

Keywords

  • Exothermic reaction
  • Fractal analysis
  • Pattern analysis
  • Reacting flow
  • Shear flow
  • Viscous oscillation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

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