A Study of the Turbulent Jet Diffusion with Chemical Reaction : 2nd Report, Properties of the Reactive Concentration Field

Abstract

The aim of this study is to elucidate experimentally the effect of chemical reaction on the diffusion process in a turbulent liquid jet. The chemical reaction in this study is second-order and irreversible reaction, R+B→S, of which kinetics is well known. The instantaneous concentrations of two species (R and S) were measured simultaneously by light absorption spectrometric method, and concentration of species B was determined by the mass conservation equation. A comparison between statistics of reactive concentration field and those of frozen and equilibrium limit deduced from the conserved scalar theory was made. It was found that the mean concentration of reactive species is closer to the frozen limit because of the relatively small Damkohler number. The r.m.s. value of the jet reactant R becomes smaller than that of frozen limit by the effect of chemical reaction, whereas that of the ambient reactant B becomes larger in the region of measurement.