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← ScienceWhich mechanism limits flow-rate when pumping viscous oil?
A)Increased boundary layer energy dissipation✓
B)Reduced fluid pressure head margin
C)Cavitation threshold pressure amplification
D)Elevated local fluid bulk temperature
💡 Explanation
Increased boundary layer energy dissipation reduces the flow-rate because viscosity causes the fluid's laminar boundary layer to increase shear stress. Therefore, more energy dissipates hindering the flow rate, rather than bulk temperature increase or cavitation.
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