On 3/6/07, Deane Yang <deane_yang@yahoo.com> wrote:
Noah Roberts wrote:
Deane Yang wrote:
Can you provide a concrete example?
Formula for Fluid Compressibility through a Venturi Tube:
Y = {[kt^(2/k)/(k-1)][(1-b^4)/(1-b^4t^(2/k))][(1-t^((k-1)/k)/(1-t)]}^.5
With k being the SP heat ratio of the fluid passing through the venturi. Static dimensional analysis is impossible here. In fact dimensional analysis at all just isn't appropriate in these odd cases.
So you're saying that the dimension/unit library does *not* need to worry about formulas like this, right? If so, my comments below are off-topic.
But I'm still a skeptic. I don't see why the trick I outlined before can't be played here, too. Tell me what each variable means and what units it is in (if any). Or give me an online reference for this formula.
It appears that he's referring to the equation given here: http://en.wikipedia.org/wiki/Orifice_plate Look for the equation under the heading "Flow of gases through an orifice". Above it and below it are references to the variable units. --Michael Fawcett