Abstract
The problem of crossflow-induced vibration in shell-and-tube heat exchangers for OTEC is considered. Models of the dominant excitation mechanisms are discussed: vortex shedding, turbulent buffeting, fluideleastic instability, and acoustic excitation. Criteria are presented for assessing vibration and equations are derived for predicting the maximum allowable span length as a function of crossflow velocity and other system variables. Also regions of acoustic resonance and noise are defined. Among the system variables studied are tube diameter, tube material, tube-field layout, and pitch-to-diameter ratio. All models are presented in a simple form that can readily be applied to the mechanical design of OTEC heat exchangers.
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