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← ScienceWhich 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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