A Study of the Turbulent Jet Diffusion with Chemical Reaction. 1st Report. Validity of a Concentration Fluctuation Measuring System of Multiple Species.

The aim of this study is to elucidate experimentally the effect of chemical reaction on the diffusion process in a turbulent liquid jet. The second-order and irreversible reaction (R+B→S) of which kinetics is well known was used here. The instantaneous concentrations of two species (R and S) were measured simultaneously by the light absorption spectrometric method, then the conserved scalar was determined by using the conserved scalar theory. To ascertain the validity of the concentration measuring system, a comparison between statistics of conserved scalar and those of non-reactive scalar was made. It was found that the radial and axial distributions of the statistics of conserved scalar show good agreements with those of non-reactive scalar and past other researcher's data. So, it is concluded that reactive scalars can be measured accurately by the present measuring system of multiple species.