SEA WATER MASS DIFFUSION COEFFICIENT STUDIES
Final rept. for 1 Jan 1963-31 Dec 1964
PHILCO NEWPORT BEACH CA APPLIED RESEARCH LABS
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The ordinary diffusion coefficient and the Soret thermal diffusion coefficient were measured for a solution of 3.5 weight percent sodium chloride in water this system was selected as a reasonable binary simulant to the multicomponent sea water system. Ordinary diffusion coefficients were measured, at 25C, for pressures over the range 1 to 1000 bars the Soret coefficient was determined at 27C and approximately 1000 bars pressure, and compared to measured values at 1 bar pressure. The influence of pressure on the ordinary diffusion coefficient in 3.5 weight percent NaCl-H2O at 25C was found to be negligible over the pressure range 1 to 1000 bars. Based upon the data from low pressure experiments and a single high pressure experiment in the Soret diffusion apparatus, the Soret coefficient at room temperature likewise appears to be virtually independent of pressure up to 1000 bars. An extensive review and analysis was made of the available literature pertaining to the viscosity and thermal conductivity of multicomponent salt solutions, including sea water. This analysis has shown that these properties are not too different from those of pure water, and can be predicted satisfactorily for engineering purposes by simple additivity relationships based upon the most important salt ions present.