Page 80 - ebook fluid mechanics_finalize

FLUID MECHANICS

4.5.1. The limits of Bernoulli’s Equation

Bernoulli’s Equation is the most important and useful equation in fluid mechanics. It may
be written,

v 2 p v 2 p
z + 1 + 1 = z + 2 + 2
1
2g  1 2g 

Bernoulli’s Equation has some restrictions in its applicability, they are :

▪ the flow is steady

▪ the density is constant (which also means the fluid is compressible)

▪ friction losses are negligible

▪ the equation relates the state at two points along a single streamline (not

conditions on two different streamlines).

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