Abstract
Noise or vibration problems in heat exchangers may be encountered in those instances when a natural acoustic frequency of the exchanger in the direction normal to the flow direction and tube length is close to the frequency determined by the Strouhal number. In this case coupling can occur giving oscillation of a large amplitude which results in an excessive pressure drop. If the banks of tubes are closely spaced, interactioni takes place between the vortexes shedding from the various banks of tubes. Experiments on pairs of tubes, in-line tubes, and staggered tubes show the Strouhal number no longer has a value of about 1/5, as for a single isolated tube, and the critical dimension may be tube spacing rather than tube diameter. Several types of equipment alterations found useful in noise suppression are given. (C.J.G.)
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