Turbulent Pressure Fluctuations in Water with Additives.
SOUTHAMPTON UNIV (ENGLAND) DEPT OF AERONAUTICS AND ASTRONAUTICS
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The pressure fluctuations at the wall beneath a turbulent boundary layer were measured for various concentrations of dilute polymer solutions to determine the effect of the polymer on the structure of the flow and to provide an insight into the mechanism causing the drag reduction which has been observed in such flows. The mechanism of drag reduction is explained in terms of a branching process involving energy transfer to the polymer molecules at an energy level which is lower than that of viscous dissipation. As a consequence of this mechanism there is also a reduction in the production of turbulent energy in order to maintain an equilibrium energy structure. Author
- Fluid Mechanics