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
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
in the spatial distributions of temperature and number densities of gaseous admixtures or particles
advected by chemically reacting turbulent flows.
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Department of Mechanical Engineering
- 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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