Turbulent reactive mixing in a rectangular microscale confined impinging-jet reactor was investigated using the pH indicator phenolphthalein in this study for three different jet Reynolds numbers Re j = 25, 1000 and 1500. Laminar flow was observed at Re j = 25 whereas the flow was turbulent at Re j = 1000 and 1500. An image processing technique was applied to instantaneous images to extract quantitative mixing data by identifying regions with pH 9.3 and regions with pH < 9.3. Ensemble averages were computed using these thresholded images to compare mixing performance between different Reynolds numbers. Finally, the spatial auto-correlation fields of the thresholded image fluctuations were evaluated, based on which large-scale turbulent structures were analyzed.
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