- 作者: 阮鴻鶱; 鄭美華
- 作者服務機構: Contribution from Union Industrial Research Institute M.O.E.A.
- 中文摘要: There are several methods available for determination of diffusion coefficients. Stefan diffusion tube was most widely used for the measurement of vapor phase diffusivity in binary systems. It was proved theoretically that the radial concentration profile may be negligible in a thin cyclindrical section. It was also shown theoretically that the velocity profile does not affect the mass flux. This report considered longtitudinal diffusivity alone. The diffusivity of toluene-air system was measured from 40℃ to 70℃ and that of benzoic acid-air system was estimated from 140℃ to 160℃.
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