Bernoulli is an energy equation, in fact the conservation of energy, so long as you can account for the energy changes due to density change
You can still use Bernoulli, but as Woody says you need a more complicated version, for instance, ignoring gravity,
$\displaystyle \frac{\gamma }{{\gamma - 1}}pV + \frac{{{v^2}}}{{2g}} = {\rm{a}}\;{\rm{constant}}$
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Last edited by studiot; May 5th 2018 at 10:03 AM.
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