Re: I need someone's brain juice here?

OK PD but:

Bernouilli without any fluid velocities (v= 0 for "1/2*density*v^2"):

P1 + density g h1 = P2 + density g h2

#1: thus P1 = P2 + density g (h2 - h1) (same as P1 = P2 + density
g h)

#2: Work1 = Work2 thus F1*D1 = F2*D2 thus P1*A1*D1 = P2*A2*D2

>>From the models in the web links given:

In #1 h = h2-h1 in #2 h = D1 + D2

Still the equations don't match???




PD wrote:
> guskz@xxxxxxxxxxx wrote:
> > Slightly off topic but the other newsgroups aren't as read....
> >
> > Here's two web links on two widely understood fluid pressure models:
> >
> > http://hyperphysics.phy-astr.gsu.edu/hbase/pman.html#meac
> >
> > http://hyperphysics.phy-astr.gsu.edu/hbase/pasc.html#hpress
> >
> >
> > Both are related to vertical pressure (or Force / Area = pressure) on a
> > fluid, yet both use 2 completely different equations to calculate the
> > fluid's vertical travel distance.
> >
> > One use's the fluid's density the other simply says Work1 = Work2 thus
> > F1*D1 = F2*D2
> > (or P1*A1*D1 = P2*A2*D2) where as the other says P1 = density * H *
> > gravity + P2
> >
> > If you look at both models you'll notice that H = D1+D2
> >
> >
> > Anyone with enough brain juice to tell me why the difference, I can't
> > figure it out since both models simply practically the same????
>
> The F1*D1 = F2*D2 assumes no height difference in the two ends of the
> pipe and doesn't take into account the work done to lift the fluid,
> which is precisely what the other one does.
> Use Bernoulli's equation. It contains both.
>
> PD

.

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