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Which instability increases within supersonic nozzle's boundary layer?

A)Shear layer transition to turbulence
B)Increased fluid dynamic lubrication effect
C)Reduced convective heat transfer rate
D)Elevated critical heat flux threshold

💡 Explanation

Increased fluid shear stress initiates transition to turbulence because adverse pressure gradients overcome viscous damping. This transition mixes momentum within the boundary layer, therefore, shear layer turbulence is likely, rather than laminar effects or changes in the heat transfer characteristics.

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