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Which flow state arises when pipe diameter decreases, holding other parameters constant?

A)Transition to turbulent flow
B)Viscosity experiences exponential decay
C)Pressure wave speed decreases
D)Wall shear stress remains uniform

💡 Explanation

Decreasing diameter increases fluid velocity, therefore increasing the Reynolds number; at a high Reynolds number the inertial forces dominate viscous forces, leading to transition to turbulent flow rather than maintaining laminar due to viscous damping.

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