Abstract
The effective use of high-frequency oscillation (H. F. O.) requires precise knowledge of the Taylor dispersion of gas on the oscillatory flow. In this study, axial gas transport and turbulent characteristics were measured on the oscillatory flow at and near resonance frequency, in a straight circular pipe to simulate the trachea. The velocity profiles are measured by a hot wire anemometer. The effective dispersion coefficient was determined by the measurement of the carbon dioxide concentration which was dispersed from the injection point. The turbulence appeared at the frequency near the resonance and turbulent intensity and kurtosis achieved maximum values at the beginning of the deceleration phase. Furthermore, the integral scale was enlarged and the lateral mixing of carbon dioxide was enhanced by the large turbulent diffusion coefficient.
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