Tube Vibration

The tubes of an exchanger are supported at both ends by the tubesheets and in intermediate positions by baffles (see Figure 15-26). Fluid flow interrelates with the heat exchanger geometry, as each tube section between two consecutive supports is a flexible element that can vibrate. The vibration that occurs depends on the mass (i.e., both that of the tube and the fluid that flows through it), on its moment of inertia, the way it is supported and the distance between supports. The natural frequency of vibration depends on the density of the shell-side and the tensile strength at which the tube is submitted, as the flow of the shell-side fluid past the tubes can produce certain periodic unbalanced forces over the tubes. When the ...

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