a 15gph nozzle will flow 15gpg water @100psig.

anyone knows how much methanol will the same nozzle flow at the same line pressure? I know its more because of the lower surface tension, viscosity and density............just want to know how much more.

good question, don't have the answer haha...

i know that the surface tension of water is about 70dyne.cm and methanol is ~20

so is 15gph water @100psig = (70/20)15 = 52.5gph / ~3308cc/min methanol@100psig???

it shouldn't be about surface tension as much as viscosity. Running a simple orifice calculation, I get

15gph water or 2.09 lbs/min water

vs

16.7 gph MeOH or 1.84 lbs/min MeOH

Just depends on if you want volumetric or mass flow.

so its bout 10% more volume

yup, due to the lower viscosity of MeOH.