Abstract
The purpose of this article is to explain why the extension of the previously published C=(S/Ho)sqrt(J) scaling for opposed rows of staggered jets wasn’t directly successful in the study by Choi et al. (2016).It is not surprising that staggered jets from opposite sides do not pass each other at the expected C value, because Ho/D and sqrt(J) are much larger than the maximum in previous studies. These, and large x/D’s, tend to suggest development of 2-dimensional flow.Although there are distinct optima for opposed rows of in-line jets, single-side injection, and opposed rows of staggered jets based on C, opposed rows of staggered jets provide as good or better mixing performance, at any C value, than opposed rows of in-line jets or jets from single-side injection.
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