Anomalous dispersion of cylindrical longitudinal guided modes.

Anomalous dispersion, phase velocity increases with frequency, of longitudinal modes in five cylindrical waveguides are numerically analyzed and summarized in this paper. The aim is to study the types and characteristics of modes exhibit anomalous dispersion, and the factors affect the anomalous. The analyses results show anomalous dispersion is relative to the surface and interface waves, and it could reflect the variations of shear modulus, density, and geometric structures. [ABSTRACT FROM AUTHOR]