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Which mechanism limits laminar flow when the Reynolds number increases?

A)Increased momentum diffusion
B)Drag reduction on surfaces
C)Onset of turbulent eddies
D)Decreased fluid density variations

💡 Explanation

Increased Reynolds number causes a sensitivity to instabilities; the increased inertial forces relative to viscous forces trigger transition to turbulence. Flow becomes chaotic due to shear stresses causing the onset of turbulent eddies, rather than momentum diffusing evenly, because higher viscosity would maintain laminar flow.

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