E2.21 Gas Viscosity at Low Pressure

Example 2.21: Estimate viscosity of nitrogen at 1 atm and 300 °K. Use the following data:

T_c = 126.05 °K, P_c = 33.5 atm, M = 28.02, Z = 0.392, ω = 0.047

Solution

Reduced temperature, T_r = 2.38

f₃(T_r) = ηξ (Table 2.2) = 7.28.

ξ (Equation 2.65) can be calculated as 0.0407. This will give us viscosity, η = 178.78 μP.

Viscosity, η (Equation 2.64):