Tests were done to study the fluidelastic instability of a cluster of seven cylinders much more flexible in the flow direction than in the lift direction. The array configuration is rotated triangular with a pitch to diameter ratio of 1.5. The array was subjected to two-phase (air-water) cross flow. Cylinder natural frequencies of 14 and 28 Hz were tested. Fluidelastic instabilities were observed at 65, 80, 90 and 95% void fraction albeit at a somewhat higher flow velocity than that expected for axisymetrically flexible arrays. These results and additional wind tunnel results are compared to existing data on fluidelastic instability.
Two-Phase Flow Induced Vibration of an Array of Tubes Preferentially Flexible in the Flow Direction
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Violette, R, Mureithi, NW, & Pettigrew, MJ. "Two-Phase Flow Induced Vibration of an Array of Tubes Preferentially Flexible in the Flow Direction." Proceedings of the ASME 2005 Pressure Vessels and Piping Conference. Volume 4: Fluid Structure Interaction. Denver, Colorado, USA. July 17–21, 2005. pp. 331-338. ASME. https://doi.org/10.1115/PVP2005-71001
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