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Which outcome occurs when pipeline crude oil temperature drops significantly?

A)Increased pressure drop reduces flow
B)Decreased drag raises pumping efficiency
C)Density decreases promote faster motion
D)Increased turbulence mixes stratified layers

💡 Explanation

A temperature drop increases viscosity; therefore, the increased viscous force causes higher frictional losses via the increased shear stresses associated with momentum diffusion, rather than higher pumping efficiency or turbulent mixing under these increased viscosity conditions.

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