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> I don't think one ought to associate the concept of "back
> pressure" with Bernoulli's equation since it requires
> distinguishing between "upstream" and "downstream", something
> Bernoulli's equation manifestly does not do.
Huh? Doesn't Bernoulli's equation deal with laminar fluid flow? There is a
v there, a flow velocity. I don't understand your objection.
>Consider the following question:
>
> An ideal fluid flows through the pipe shown below. Where is the
> pressure highest and why?
> --------
> -------- /
> \ /
> -------------
>
> -------------
> / \
> -------- \
> --------
>
If I read correctly, we have a pipe narrowing followed by a pipe
enlarging. At each junction there is a pressure gradient - a pressure
drop at the first junction (where the fluid speeds up), and a pressure
rise at the second junction (where the fluid slows down). I assume a left
to right flow direction in your diagram.
What's the problem?
Bob Sciamanda (W3NLV)