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Doesn't Bernoulli's Principle contradict Pascal's Principle?
Fluid enters a large pipe at pressure P. One meter later, the pipe has a smaller diameter.
According to Bernoulli's Principle, the velocity at this point increases and the pressure decreases.
BUT according to Pascal's Principle, the applied pressure should be felt everywhere.
Is there no contradiction because Pascal's Principle only applies to confined fluid, while Bernoulli's Principle only applies to dynamic, unconfined fluid?
1 Answer
- Andrew SmithLv 78 months ago
I answered this elsewhere. Yes it is contradictory if you don't limit your conditions to those of negligible velocity. Yet even within a venturi Pascal's principle applies to that area. The pressure on the walls of the venturi is the same as the pressure inside the rest of the fluid in the same venturi. This is true if the velocity is also the same at all points within the same cross section. ( that isn't always the case though).
