Simple and Accurate Method for Calculating Viscosity of Gaseous Mixtures

摘要

The Bureau of Mines Helium Field Operations has developed a simple and accuratemethod for calculating the viscosity of gas mixtures. Only the composition of the mixture and the molecular weights and viscosities of the pure components in the mixture are required. The momentum fraction of a mixture is calculated from the composition. The fluidity is calculated as a quadratic function of the momentum fractions. The efficiency factor for transfer of momentum in collisions between bodies of different masses is derived and used with one empirical constant. The viscosity is the reciprocal of the fluidity.