Thermal pressure applied to the prediction of viscosity of simple substances in the dense gaseous and liquid regions

✍ Scribed by David A. Lennert; George Thodos

• Publisher: American Institute of Chemical Engineers
• Year: 1965
• Tongue: English
• Weight: 412 KB
• Volume: 11
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690110132

✦ Synopsis

The reduced thermol pressure-temperature ratio has been used to relate residual viscosity modulus for argon, krypton, and xenon into a unique relotionship applicable for the dense gaseous and liquid regions. For these monatomic substances the critical compressibility foctor i s zc = 0.291. Values of ( ~P R / ~T R ) ~R vs. (fi -p*)E an log-lag coordinates produced a linear relationship. For these simple substances, this relationship was used to predict viscosities with an average deviation of 3.0% for fifty eight experimental values. This relationship was also applied for the prediction of viscosities for nitrogen, oxygen and carbon dioxide.

The approach developed in this study merits further examination with several additional substances. The lack of adequate thermal pressures in the dense gaseous and liquid regions of substances other than argon limits the use of this study to substances having critical compressibility factors zc = 0.291.