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[en] Water tunnel experiments were conducted on both equilateral triangular and square arrays with a pitch ratio of 1.5. The tests were run with different array orientations so that the effects of incident flow direction on cross flow induced vibration could be studied. Strouhal numbers of 0.56 and 0.43, based on pitch velocity, were found for the normal triangular and square arrays respectively. No significant resonant amplitudes were observed. The fluidelastic threshold for the normal triangular array was found to be about twice that of the parallel triangular array. However, the stability threshold for the normal triangular array was found to be quite sensitive to incident flow direction suggesting that this higher threshold should not be used in the design of heat exchangers. The square array was found to be rather insensitive to the approach flow direction. Intermediate angles have higher thresholds than the two standard patterns (square and rotated square). (author)
Source
UKAEA Windscale Nuclear Power Development Labs.; British Nuclear Energy Society, London; p. 2-24; ISBN 0 7277 0192 4; 
; 1983; p. 2-24; British Nuclear Energy Society; London (UK); 3. international conference on vibration in nuclear plant; Keswick (UK); 11-14 May 1982
; 1983; p. 2-24; British Nuclear Energy Society; London (UK); 3. international conference on vibration in nuclear plant; Keswick (UK); 11-14 May 1982