Capillary constant and surface tension of propane (R-290) with small additives of hydrogen

Abstract

A differential variant of the capillary rise method was used to measure the capillary constant and to determine the surface tension of a propane (R-290) + hydrogen system. The measurements were carried out for 13 isotherms in the temperature range 95–355 K at pressures from the saturated vapor pressure of pure propane up to 4 MPa. Equations are proposed that describe the concentration and pressure dependences of the capillary constant and surface tension. It is shown that an increase in the concentration of hydrogen in the solution leads to a decrease both of the capillary constant and the surface tension.