Reduction of Turbulent Diffusion by Chemical Reactions and Phase Transitions

         We showed that turbulent transport in fluid flows with chemical reactions or heterogeneous phase transitions is strongly modified, e.g., coefficient of turbulent diffusion of chemically reacting component can be strongly depleted. In addition, we predicted the existence of nondiffusive heat and mass fluxes of the components in the systems with chemical reactions or heterogeneous phase transitions. These fluxes can be interpreted as “turbulent” analogs of the known cross-effects in the irreversible thermodynamics. The mechanism of turbulent cross-effects is completely different and is associated with turbulent transport in reacting flows. These effects may result in the excitation of a large-scale instability which causes formation of large-scale inhomogeneities in the spatial distributions of temperature and number densities of gaseous admixtures or particles advected by chemically reacting turbulent flows.
  1. T. Elperin, N. Kleeorin, and I. Rogachevskii, Effect of Chemical Reactions and Phase Transitions on Turbulent Transport of Particles and Gases. Physical Review Letters, 80, 69-72, 1998.
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