Head Loss calcs

Head loss = delta P/L = Darcy * p * (Q/A)^2 / (2*D)
Darcy friction factor for turbulent flow, using Blasius approximation ~= .316 * (Re)^(-1/4)
Re = Reynold's number = Q*D/(nu*A)
Q = volumetric flow rate (m^3/s) = .05
D1 = 2.5" pipe diameter (m) = .0635
D2 = 3/4" pipe diameter (m) = .01905
A = pi*D^2/4 = 2.85e-4 m^2
u air @ 35 degrees C ~= 1.9e-5 kg/(m*s)
p air = 1.14 kg/m^3
nu = kinematic viscosity (m^2/s) = u/p = 1.7e-5

Re = 1.97e5 -> turbulent flow
Darcy friction factor = .015

Delta P, D1 = ~4.6 mm H2O/m

Delta P, D2 = ~1,400 mm H2O/m
Which seems really high because our pump is only outputting 4000, but the mixing seems satisfactory everywhere along the line.

I have not accounted for line openings yet.