https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=10631&context=rtd

Numerical studies of chemical selectivity and heat transfer in decaying homogenous turbulence

: The more important results and developments achieved as a direct result of this contract are as follows: A model for the calculation of turbulent flows was constructed which incorporates effects of Reynolds stress relaxation with the generation or destruction of turbulent energy by rotation. The model was verified by comparison with experiment. It was then used to predict the properties of isolated turbulent vortices and applied to the turbulent mixing layer, in particular to the formation and interaction of the organized structure in the mixing layer. An alternative approach to the mixing layer in which it is modelled by a rolling-up vortex sheet between fluids of different density has also been formulated. Calculations of strained flame elements for use in the coherent flame mode of H2, F combustion showed that only at very high strain rates was sufficient vibrational nonequilibrium produced to be of interest for a chemical laser. This result is reflected in the fact that only in the early portion of the jet, where strain rates are a maximum, does this vibrational nonequilibrium occur. Experimental results were obtained in a new facility and by a new technique for the amount of reaction product obtained betwen two chemically reacting aqueous streams. Results at high and low Reynolds number showed the dependence of the mixing on Reynolds number and Schmidt number. A transition Reynolds number region was found and the nature of the generation of small scale motions which dominate the formation of reaction product was explored. (Author)

H. W. Liepmann

Papers

Chemical Reactions in Turbulent Mixing.