C-244 液相格子乱流中における二次反応拡散場の実験的研究

概要

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The second-order reactive diffusion field (R+B→S) in the liquid grid-turbulence has been investigated experimentally. For the three cases of the mesh Reynolds number Re_M=700,800 and 900,the concentrations of all the species (R, B and S) have been measured simultaneously by the combined technique of the light absorption spectrometric method and the conserved scalar theory. To make the effect of turbulence clearer, the new nondimensional convection time is suggested, and then the downstream variations of concentration statistics have been considered on the basis of this new convectional time. It is found that as Re_M becomes smaller (as the Damkohler number approaches to 1 more quickly) the effect of turbulence on the chemical reaction becomes larger. The relaxation processes of the concentration p.d.f. (probability density function) for species R, B and S have been also examined, and it is shown that the p.d.f. profiles of all the species approach to the Gaussian distribution in the downstream direction.
日本流体力学会の論文
2003-07-28