CALIFORNIA UNIV IRVINE DEPT OF MECHANICAL ENGINEERING
In turbulent reacting flows, completion of chemical reactions requires diffusion of reactive species at a molecular level. Eddies rich in one reactant can be present in many turbulent flows involving finite rate chemical reactions. Local species stratifications are dissipated by molecular diffusion and chemical reaction under the influence of the local flow field. In many turbulent flows, the local flow field has a strong rotational character. It is mostly this rotational motion which enhances mixing through flow stretch and convection leading to mixing at the molecular level. In this paper, molecular mixing and finite rate chemical reactions in a two dimensional viscous vortex are examined analytically. Two species initially separated across a plane are allowed to diffuse and react in the presence of a line vortex centered at this separation plane. Keywords Turbulent reacting flows, Molecular mixing, Reaction, Turbulent structures.