gas flow formula 1

[wonderlandinirvine]

Do anyone recognizes the following Gas Flow formula (for air here)?

W (lbs/sec) = 6.30*Cd* (d^2) *P1 /[(53.34*T)^0.5] * {3.5[(P2/P1)^1.429 - (P2/P1)^1.714]}^0.5

I would appreciate someone can point me to the source.

I understand one from "Crane":

qm' (SCFM) = 678 *Y *(d1^2)* C *{[deltaP*P1'/(T1Sg)]^0.5}

But they have gap and I do not know how to prove they are the same.

Thank you in advance for your kind help.

 

[KirbyWan]

That looks like one of the empirical heat transfer equations, but I don't have my Heat and Mass Transfer book handy. I'll look when I get home this evening if noone gets to it before then.

-Kirby

 

[wonderlandinirvine]

Hi Kirby,

Thank you. I'm sorry that I forgot to mention they are gas flow equation through orifice. "Crane" means "Crane Co. - Technical Paper No. 410". Anyway, thank you for your kind help.