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← ScienceWhich outcome results when injecting highly viscous polymer into turbulent flow?
A)Drag reduction along the boundary✓
B)Increased kinetic energy dissipation rate
C)Higher pressure drop in system
D)Strengthened coherent vortex structures
💡 Explanation
Drag reduction initiates via turbulent drag reduction because the high polymer viscosity suppresses small-scale turbulence; therefore, drag decreases, rather than energy dissipating more quickly; high viscosity injection reduces, rather than strengthens, energy dissipation.
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