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Which effect occurs near a turbine blade's surface when cavitation number decreases below a threshold?

A)Localized boiling point temperature reduction
B)Increased fluid dynamic lift vector
C)Enhanced boundary-layer laminar flow
D)Decreased flow separation stall margin

💡 Explanation

Decreasing cavitation number permits boiling on blade surfaces because vapor pressure exceeds local pressure per the cavitation number definition formula; therefore, the boiling point reduces locally, rather than increased lift because the boiling disrupts smooth flow.

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