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← ScienceWhich consequence results when viscous fluid accelerates through reducer?
A)Increased drag force and energy losses✓
B)Decreased system pressure downstream quickly
C)The internal fluid laminar flow increases
D)Cavitation risk decreases dramatically and predictably
💡 Explanation
Increased drag and energy losses occur because decreasing pipe diameter forces fluid acceleration, intensifying the viscous boundary layer shear and the dissipation of kinetic energy into heat. This viscous dissipation represents a tangible inefficiency, therefore drag increases, rather than a reduction in downstream pressure.
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