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← ScienceWhich outcome occurs when the assumptions behind the Hagen-Poiseuille equation are not met in a constricted pipe carrying a viscous Newtonian fluid?
A)Onset of sustained flow turbulence✓
B)Maintenance of laminar pressure drop
C)Decreased effective fluid viscosity
D)Increased pipe wall boundary layer
💡 Explanation
Flow becomes turbulent because the Reynolds number exceeds the critical value due to increased velocity; therefore, the pressure drop deviates from that predicted by the Hagen-Poiseuille equation, rather than remaining laminar.
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