The Viscosity of Mixtures of Liquids at High Pressures

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Abstract
The effects of pressure and temperature change on the viscosity of organic, binary mixtures have been investigated by methods developed and used by P. W. Bridgman. Six mixtures have been examined over the entire concentration range at two temperatures, 30° and 75°C, and at pressures extending to 12,000 kg/cm2. The isobaric, log viscosity‐concentration curves for n‐hexane carbon disulphide, and n‐hexane n‐decane are linear at both temperatures, indicating that these mixtures obey Arrhenius' empirical equation for the viscosity of a binary mixture. It is believed that a comparatively simple type of interlocking among molecules occurs in these mixtures due to the effectively linear structure of the molecules and the absence of non‐uniform molecular fields such as would cause some sort of association. For the remaining mixtures: n‐hexane diethyl ether, n‐hexane chlorobenzene, n‐pentane benzene, and eugenol carbon disulphide, the corresponding viscosity isobars are more complex; irregularities occur in certain regions of concentration which vary with temperature and pressure. In these latter mixtures, the interlocking at high pressures is complicated by the structural differences of the component molecules and their effects. The viscosity of n‐decane as a function of pressure and temperature has also been investigated. Density data at atmospheric pressure and 30° are included in the paper.

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