Which of the following situations is least suitable for direct use of the simple Bernoulli equation P + ½ρv² + ρgh = constant without adding a pump term, turbine term or viscous-loss correction?
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Question

Which of the following situations is least suitable for direct use of the simple Bernoulli equation P + ½ρv² + ρgh = constant without adding a pump term, turbine term or viscous-loss correction?

G1 Physics · Accepted Answer

The simple Bernoulli equation represents conservation of mechanical energy per unit volume for steady, incompressible, non-viscous flow along a streamline, with no external energy addition or extraction. A long narrow tube with strongly viscous flow involves significant mechanical-energy loss due to viscosity. Therefore a loss term is required, and the simple Bernoulli equation alone is not adequate. Correct option: C.