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← ScienceWhich outcome occurs when Reynolds number exceeds 4000 in a pipeline?
A)Laminar flow transitions to turbulence✓
B)Viscosity effects become dominant
C)Pressure drop increases linearly
D)Boundary layer thickness reduces
💡 Explanation
Turbulent flow initiates because exceeding the critical Reynolds number triggers the Kelvin–Helmholtz instability mechanism, amplifying disturbances within the fluid. Therefore, a transition to turbulence occurs, rather than maintaining laminar flow or other effects limited to viscous-dominated regimes.
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