Vortex Shedding in Normal Triangular Tube Arrays

Abstract Vortex shedding in normal triangle tube arrays has been studied experimentally over the pitch ratio range, P/d = 1·14-2·67, and Reynolds number range 7·6 × 102-4·9 × 104. Hot wire measurements of the flow periodicity, and flow visualizations are reported from a rigid-tube, large-scale wind tunnel model. These results show that first-row alternate vortex shedding occurs in every pitch ratio, except P/d = 1·14. For P/d ≥ 2·0, second-row vortex shedding occurs at a lower frequency than that from the first row, for a given upstream velocity. Strouhal numbers characterizing these phenomena are reported, and compared to existing data in the literature.