Transition to Turbulence and Gas Transport in the Oscillatory Flow through a Straight Circular-Cross-Sectional Pipe

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Experiments have been carried out to obtain the effective diffusivity of carbon dioxide for axial transport in the oscillatory flow through a straight pipe with circular cross-section for the case of a transition from laminar flow to turbulent flow. An experimental apparatus and procedures were devised to coincide with the theoretical situation. Results have been compared with the theoretical predictions by Watson and found to be in excellent agreement with both the theoretical and the experimental values in the case of laminar flow. The present results have less dispersion than those by the other researchers. In the case of turbulent flow, the results were larger than the theoretical values for the case of laminar flow because of the transition to turbulence. Using dynamically similar water, the axial velocity variations of the oscillatory flow were measured by the LDV system for several conditions. The turbulent intensity of the axial velocity and the effective diffusivity have been found to have a strong interrelation between each other.
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