Influence of flow speed on guided waves in a liquid filled pipe

Liquid-filled pipes that are widely used in industries must be regularly inspected for the structure integrity. Elastic guided waves are suitable for long-range pipe inspections. In this paper, the influences of the flowing speed and temperature of the fluid flow on the propagation properties of guided waves in pipes filled with flowing high temperature liquid metals are investigated. The dispersion equation is theoretically derived applying coordinate transformations, and then simplified to get its approximation form, and finally numerically solved to obtain dispersion curves. The aim is to choose the suitable guided modes for nondestructive evaluation (NDE) of pipes, which are nonsensitive to the flow speed and the varying temperature of the fluid flow inside the pipe.