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← ScienceWhich outcome raises the pressure when a viscous hydraulic fluid flows through a narrowing pipe?
A)Viscous dissipation turning mechanical energy to heat✓
B)Adiabatic expansion due to pressure reduction
C)Turbulence converting kinetic energy to vorticity
D)Cavitation causing vapor bubbles to collapse
💡 Explanation
Viscous heating occurs because the fluid's internal friction (viscosity) causes the kinetic energy to convert to heat, therefore thermal energy increases the pressure rather than the alternatives of expansion due to pressure drop or turbulence effects.
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