The Viscosity‐Pressure Dependence of Gas‐Liquid Solutions

Abstract A High‐Pressure‐Viscometer for gas‐liquid solutions was developped representing a combination of a falling body and a capillary viscometer. The method is suitable also for measurements in wells. By solution of He, Ne, Ar, H2, N2 and CO2 the viscosity‐pressure isotherms of Squalane and Squalene were measured in saturated and unsaturated state. The viscosity under pressure can be diminished by the dissolved gas for one decade or more, the influence of various gases being different. The isotherms of the saturated solutions often pass a minimum of viscosity, which can be reproduced by an equation with two parameters. The viscosity‐pressure‐coefficients of unsaturated solutions with constant concentrations only are a little smaller than the coefficients of the pure liquids. This can be used to predict the viscosity of binary gas‐liquid solutions at high pressures.