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why bernouli's theorem is not applicable to viscous fluid?

why bernouli's theorem is not applicable to viscous fluid?

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Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
8 years ago
Bernoulli's equations are not applicable where there are viscous forces (the fluid equivalent of friction forces), for example in a boundary layer. The Navier–Stokes equations must be used instead. Essentially, these are the Euler equations with an extra term for the divergence of the stress tensor.

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