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Which outcome occurs when high pressure fluid encounters sudden expansion?

A)Increased flow instability and turbulence
B)Decreased fluid shear stresses appear
C)Laminar becomes dominant fluid flow
D)Pressure gradients smooth the flow

💡 Explanation

Increased flow instability and turbulence result because flow separation induces the Kelvin-Helmholtz instability in shear layers when fluid mixes at different axial speeds within eddies. It is intensified turbulence rather than laminar flow, therefore pressure drop changes rather than reducing shear.

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