Visualization of turbulent reactive jet by using direct numerical simulation

Tomoaki Watanabe, Yasuhiko Sakai, Kouji Nagata, Osamu Terashima, Hiroki Suzuki, Toshiyuki Hayase, Yasumasa Ito

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Direct numerical simulation (DNS) of turbulent planar jet with a second-order chemical reaction (A + B → R) is performed to investigate the processes of mixing and chemical reactions in spatially developing turbulent free shear flows. Reactant A is premixed into the jet flow, and reactant B is premixed into the ambient flow. DNS is performed at three different Damköhler numbers (Da = 0.1,1, and 10). Damköhler number is a ratio of a time scale of a flow to that of chemical reactions, and in this study, the large Da means a fast chemical reaction, and the small Da means a slow chemical reaction. The visualization of velocity field shows that the jet flow is developed by entraining the ambient fluid. The visualization of concentration of reactant A shows that concentration of reactant A for Da = 1 and 10 becomes very small in the downstream region because the chemical reaction consumes the reactants and reactant A is diffused with the jet development. By comparison of the profiles of chemical reaction rate and concentration of product R, it is found that product R for Da = 10 is produced by the chemical reaction at the interface between the jet and the ambient fluids and is diffused into the jet flow, whereas product R for Da = 0.1 is produced in the jet flow after reactants A and B are well mixed.

Original languageEnglish
Article number1341001
JournalInternational Journal of Modeling, Simulation, and Scientific Computing
Volume4
Issue numberSUPPL.1
DOIs
Publication statusPublished - 2013

Keywords

  • Turbulent flow
  • direct numerical simulation
  • jet

ASJC Scopus subject areas

  • Modelling and Simulation
  • Computer Science Applications

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