Answer: Bernoulli's Equation: How Does It Create High/Low Pressure?

[skaboy607]

Hi,

Hopefully a very simple question for someone that knows; We know from Bernoulli's principle that an area of high velocity creates an area of low pressure and vice versa. My question is how is this created?

Thanks

 

[russ_watters]

It is a manifestation of conservation of energy. And to be more accurate and descriptive, Bernoulli's principle states that the total pressure (ie, the energy) is constant along a streamline. So when you have an area of higher velocity, you get a higher velocity pressure - and by conservation of energy, the static pressure must be lower.

 

[tiny-tim]

… pressure (ie, the energy) …

Just to enlarge on that:

pressure = force/area,

so pressure/density = force times distance/mass = work done/mass = energy gained/mass