Step 1. What are the parameters used in Johnstone’s equation?
η = fractional collection efficiency
k = correlation coefficient whose value depends on the system geometry and operating conditions,typically 0.1 to 0.2, 1000 acf/gal
QL/QG = liquid-to-gas ratio, gallons per 1000 acf
ψ = Cf ppv(dp)2/18dd μ = inertial impaction parameter
pp = particle density
v = gas velocity at Venturi throat, feet per second
dp = particle diameter, feet