A STUDY OF THE MIXING OF DRAG REDUCTION POLYMERS.
WESTERN CO OF NORTH AMERICA DALLAS TEX RESEARCH DIV
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Drag reductions of up to 79 were demonstrated by injection of high molecular weight water soluble polymers into water. Synthetic polymers were determined to be the most suitable for torpedo drag reduction. Slurries of polymers in non-solvents, at concentrations of about 40 wt. of the active polymer, can be made, pumped and dispersed in a water stream and give dramatic friction reduction. In addition it is feasible to carry a sufficient amount of this type slurry on board a torpedo. From the time of injection of a slurry of polymer particles in a non-solvent into a flowing stream of water, a drag reduction of 46 has been achieved in 0.08 seconds and 79 drag reduction in approximately 0.34 seconds. It was established that a high degree of turbulence is necessary to disperse and dissolve the polymer sufficiently in the short time available. The feasibility of the use of polymers in solution to reduce the drag on a torpedo was demonstrated.
- Fluid Mechanics