Accession Number : AD0649776

Title :   VAPOR PRESSURE OF FLUIDS IN HIGH-PRESSURE GAS ATMOSPHERES.

Descriptive Note : Research and Development phase rept.,

Corporate Author : NAVY MARINE ENGINEERING LAB ANNAPOLIS MD

Personal Author(s) : Ventriglio,Danute R. ; McQuaid,Richard W.

Report Date : MAR 1967

Pagination or Media Count : 56

Abstract : As part of the investigation of the critical parameters in the combustion of hydraulic fluids, experiments were conducted to verify the accuracy of the Poynting equation which predicts the effect of inert gas pressure upon the vapor pressure of a liquid. In the initial experiments, relatively simple and noninteracting molecules were used, n-hexane and helium. Vapor-pressure measurements were performed at temperatures up to 250 F and at pressures up to 2000 pounds per square inch gage. Although the form of the Poynting equation appeared applicable, it was necessary to add corrections for liquid compressibility, gas solubility in the liquid, and for intermolecular forces (by use of fugacity instead of vapor pressure). It appears that this method may be extended to more complicated molecular structures, and future work is planned to investigate the vapor pressure of liquids of increasing complexity under high inert gas pressure and eventually that of known hydraulic fluids.

Descriptors :   (*HYDRAULIC FLUIDS, *COMBUSTION), (*VAPOR PRESSURE, GASES), COMPRESSIVE PROPERTIES, SOLUBILITY, THERMODYNAMICS, HIGH PRESSURE, MOLECULAR STRUCTURE, HELIUM, ACCURACY, CORRECTIONS

Subject Categories : Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE