Make your own free website on Tripod.com

Venturi Equations

Data for Oxygen (a.k.a. GOX, GO2 )

Excel Spreadsheet available (R. McLeod)

Equations
Discharge Coefficient (1) CD = a bP Pc ( 500 < P(pisa) < 1500 )
Mass Flow Rate (2) mdot = P CD A Sqrt(CS)
mdot Coefficent (3) CS= ( 2 / gp1 )(gp1/gm1) ( (gamma * gc) / ( R * T ) )
Shorthand Notation (4) gp1 = gamma +1
(5) gm1 = gamma -1
Parameters
P Pressure lbf/in2 (psia)
Eqn (1)
lbf/ft2 (psfa)
Eqn (2)
T Temperature R -
A Throat Area ft2 -
gamma Ratio of Specific Heats - -
gc Gravatational Constant lbm-ft / lbf-s2 32.174
RU Universal Gas Constant ft-lbf / lbm-R 1545
R Gas Constant ft-lbf / lbmol-R R = RU/MW
MW Molecular Weight (Oxygen) lbm/ lbmol 31.999
Discharge Coefficient Equation Coefficients

    S/N

Throat dia (in.) a b c
36381 .0108 0.973 548 08 0.999 999 04 0.002 611 03
36382 .0207 0.979 063 92 0.999 999 31 0.001 883 59
36383 .0309 0.981 677 05 0.999 999 43 0.001 540 34
36384 .0472 0.983 925 22 0.999 999 54 0.001 246 06
36385 .07 0.985 638 91 0.999 999 62 0.001 021 86
36386 .115 0.987 360 62 0.999 999 71 0.000 797 48
36387 .17 0.988 449 97 0.999 999 76 0.000 655 55
36388 .25 0.989 336 89 0.999 999 80 0.000 540 15
36389 .4 0.990 220 57 0.999 999 84 0.000 425 31
363810 .5 0.990 585 90 0.999 999 86 0.000 377 93