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← ScienceWhich process reduces efficiency when pumping viscous oil?
A)Adverse pressure gradient formation
B)Laminar sublayer thickening✓
C)Onset of cavitation erosion
D)Increased thermal boundary resistance
💡 Explanation
Increasing oil viscosity increases the laminar sublayer, influencing flow because viscous effects damp turbulence near the wall. This increases frictional resistance and energy loss, therefore a thicker sublayer reduces pumping efficiency rather than pressure gradients alone.
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