Enhanced Dispersion in Drag Reducing Open Channel Flow

by Jerald P. Peterson, Sr. Res. Engr.; Hercules, Inc., Cumberland, MD,
Walter E. Castro, Prof. of Mech. Engrg.; Clemson Univ., Clemson, SC,
Paul B. Zielinski, (M.ASCE), Assoc. Prof. of Civ. Engrg.; Clemson Univ., Clemson, SC,
William F. Beckwith, Assoc. Prof. of Chem. Engrg.; Clemson Univ., Clemson, SC,

Serial Information: Journal of the Hydraulics Division, 1974, Vol. 100, Issue 6, Pg. 773-785

Document Type: Journal Paper


Results are presented concerning the effect of high polymer drag reducing additives on turbulent dispersion in open channel flow. Theoretical analysis shows that the dispersion coefficient should be greatly enhanced in a drag reducing flow. The data obtained for the longitudinal turbulent dispersion coefficient increases with increasing polymer concentration for dilute polymer solutions at a given Reynolds number. The data for the flow of water and dilute polymer solutions show that the dispersion coefficient varies linearly with the Reynolds number for each concentration. Above a Reynolds number of 10,000, the dispersion coefficient could be predicted from theoretical equations with a single empirical constant.

Subject Headings: Open channel flow | Polymer | Reynolds number | Drag (fluid dynamics) | Dilution | Chemical additives | Turbulent flow | Water flow

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