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Which risk increases when the impeller speed in a slurry mixing tank exceeds the critical value?

A)Wall shear stress amplifies erosive wear
B)Fluid density inhibits suspension stability
C)Settling rate exceeds upward mixing
D)Boundary layers dominate momentum transfer

💡 Explanation

Excessive impeller speed induces cavitation and turbulence, magnifying wall shear stress because the turbulent eddies deliver impulsive forces to the tank walls facilitating erosion. Therefore erosive wear increases, rather than the slurry settling, which decreased turbulence would promote at low impeller speeds.

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