Vortex Shedding Frequencies of the Flow through Two-Row Banks of Tubes

Abstract

This paper deals with the problem of vortex shedding from parallel rows of circular cylinders of equal diameter set normal to an airstream. A single row of cylinders is first discussed. The experimental results show that when the lateral spacing between the axes of two adjacent cylinders is less than two diameters the flow downstream of the row does not exhibit any obvious single dominant frequency of vortex shedding. The flow set up by two rows of cylinders is next considered for both tandem and staggered arrangements of the cylinders. The sets of measured values reported are complete in the sense that they cover the whole range of spacings for which a dominant frequency of vortex shedding could be measured. The Reynolds numbers of these tests correspond to the high subscritical range for a cylinder in isolation.