A basic characteristic of parallel flow with a chemical reaction, especially the effects of chemical reaction on the process of mixing has been investigated. In this study, the process of the mixing has been experimentally investigated using the LIF-PIV techniques. In this paper, the reaction between the ammonia solution and the acetic acid solution has been selected as a simple irreversible chemical reaction. The reaction between these solutions has negligible small heat of the reaction. The

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... ocess of mixing has been estimated qualitatively by the LIF technique. In order to evaluate the process of mixing quantitatively, the PIV technique has been carried out. As a result, it has been found that the mixing with chemical reaction is relatively suppressed, comparing with that without chemical one.