Fluid mechanics, bernulli equation: reference points

[Marchese_alex]

Can anyone give me some advice on where I should take my points of reference when using bernulli equation. I know the point will vary according to the problem, but can one say, always begin looking for this and that and apply the equation... Then move to this and that, etc

 

[Marchese_alex]

Also for the datum... I know i can put it anywere but try to put it _____________.

 

[rude man]

For pressure you can use gauge or absolute pressure. Kinetic energy terms should be absolutes from the observer's viewpoint, since k.e. is a nonlinear function of speed. For the potential energy term you can pick any height datum you want. In all cases just make sure you use the same datums for both sides of the equation!