Viscosities of gases

Liquid metal selection is usually limited to the lower melting point metals in Table 15. Figure 17 shows that Hquid metal viscosity generally is similar to water at room temperature and approaches the viscosities of gases at high temperature. Hydrodynamic load capacity with both Hquid metals and water in a bearing is about 1/10 of that with oil, as indicated in Table 2. 

Viscosities of Gases Coordinates for Use with Fig. 2-32.. . . Nomograph for Determining a) Absolute Viscosity of a Gas as a Function of Temperature Near Ambient Pressure and (h) Relative Viscosity of a Gas Compared... 

I. F. Golubev, Viscosity of Gases and Gas Mixtur es, Moscow 1959 transl. U.S. Department of Commerce, Clearinghouse for Federal Scientific and Technical Information, Springfield, Va., TT 70-50022, ISPT Cat. No. 5680, Table 4, Jerusalem 1970. 

The following polynomial can be used to estimate the viscosity of gases ... 

Weintraub, M., Corey, P.E. High Temperature Viscosity of Gases Estimated Quickly, Chemical Engineering, Oct. 23, 1967, p. 204. 

The book by Reid et al. [9] is an excellent source of information on properties such as thermal conductivities, diffusion coefficients and viscosities of gases and liquids. Not only are there extensive tables of data, but many estimation methods and correlations are critically reviewed. 

As illustrated in the low-density limit of Fig. 3.3, the viscosity of gases increases with increasing temperature. Moreover, for pressures well below the critical pressure, there is very little pressure dependence. The kinetic theory of dilute gases provides the theoretical basis for the temperature dependence. The Chapman-Enskog theory provides an expression for dilute pure-species viscosities as... 

In most instances, the petroleum engineer is concerned with the viscosity of gases at pressures far removed from one atmosphere, so we must now turn to a method of calculating gas viscosity at high pressure. 

Golubev. I. F., Viscosity of Gases and Gas Mixtures A Handbook (USSR). Distributed by NTIS. Spnngficld. Va. (1959). 

At high pressures, experimental results indicate that the dynamic viscosity of gases is independent of pressure over a wide range (approximately 1 mbar to 50 bar). Table 1.3 lists some values for the dynamic viscosity of gases. 

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