鉱油に対する気体の飽和溶解度と拡散係数の測定

概要

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The present paper deals with precise measurements of the diffusion coefficients as well as the saturated solubilities of single component gases such as N_2, O_2 and CO_2 to a mineral oil. The method to determine the diffusivity is based on measuring the pressure changes caused by the one-dimensional diffusion between the gas and the oil enclosed in an airtight container. For N_2 and O_2 the profiles of the measured pressure changes agree well with those predicted by the diffusion theory, whereas that is not the case with CO_2. Although the reason why CO_2 does not seem to obey the diffusion theory has yet to be studied, it may suggest the possibility that the diffusion coefficient varies with the pressure, considering that the range of pressure changes in the diffusivity measurement was much larger for CO_2 than for the other two gases. The scattering of the diffusion coefficients obtained for N_2 and O_2 by this method fell to within +30% of the average. Moreover the solubility measurements have revealed that Henry's law holds true between the three pure gases and the oil tested, and that O_2 and CO_2 dissolve into the oil approximately two and ten times more, respectively, than N_2.
一般社団法人日本機械学会の論文
1997-05-25