[AR] Re: Estimating Coefficient of Discharge (Cd)
- From: "Graham Sortino" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "gnsortino@xxxxxxxxx" for DMARC)
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Sat, 13 Sep 2014 13:55:39 -0700
Thanks Dave, that is a fair point and I should have responded to that earlier.
They are single hole orifices machined by Okeef
(http://www.okcc.com/PDF/NPT%20connections.pdf). I'm suspect they are not
perfectly 0.023 or 0.035" but I've used Okeef orifices for some time and I
generally find them to be quite accurate. My hunch is that orifices themselves
aren't the problem. I was just a bit surprised by such a large difference in Cd
for not much of a change in orifice diameter.
On Saturday, September 13, 2014 4:42 PM, David Weinshenker
<daze39@xxxxxxxxxxxxx> wrote:
Graham Sortino (Redacted sender gnsortino@xxxxxxxxx for DMARC) wrote:
> Apologies... yes that was a typo. The orifice diameters are 0.023 and
> 0.035 respectively.
Ah - how did you measure the diameters then? I'd be even more inclined
to suspect either or both of my previous suspicions, with such small
diameters... small burrs etc. can make a significant difference, and
there's the question of how exactly one has achieved the design diameter
in actual practice.
Were these tests done with single holes or with arrays of similar holes?
-dave w
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