The Hirschfelder-Bird-Spotz equation is commonly used in predicting binary bas diffusivities by using its theoretical foundations. A more recent correlation has been developed by Fuller and is given...

The Hirschfelder-Bird-Spotz equation is commonly used in predicting binary bas diffusivities by using its theoretical foundations. A more recent correlation has been developed by Fuller and is given as:

Where:

P = total pressure (Pa)

Mi = molecular weight of species, i

DAB = diffusivity, cm2/s

T = temperature, K

∑Vi = Sum of the diffusion volumes for component i, as given in the Table P3.27

Calculate the diffusivity of CH4 in air at 35°C at 1 atm.