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← ScienceWhich outcome decreases stability in a laminar boundary layer subject to increased free stream turbulence?
A)Enhanced momentum diffusion downstream✓
B)Delayed laminar-turbulent transition point
C)Reduced turbulent kinetic energy cascade
D)Increased adverse pressure gradients
💡 Explanation
Increased free stream turbulence triggers enhanced momentum diffusion because it decreases fluid dynamic viscosity via increased random molecular motion; therefore enhanced mixing accelerates instability growth, rather than delaying transition since viscosity is lowered.
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