Talk:Lewis number

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Isn't the Lewis number the ratio of the thermal diffusivity to the self diffusion co-efficient, rather than just mass diffusion?

The self diffusion coefficient being the rate of transport of a species compared to the concentration gradient of the species, with zero molecular transport? Thus a binary diffusion coefficient is possible if two different gasses are involved...

Source: Strehlow, R. A. 1984. Combustion fundamentals, McGraw-Hill series in Energy Combustion and Environment, McGraw-Hill Books, New York. 155.198.66.52 (talk) 12:22, 25 February 2008 (UTC)