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Mass diffusivity of Gasoline Vapour in Air

Mass diffusivity of Gasoline Vapour in Air

Mass diffusivity of Gasoline Vapour in Air

(OP)
Can anyone tell me the mass diffusivity of gasoline (C7.2 H12.6) vapour in Air as a function of temperature ?

I know this comes accorrss as a bit Lazy, and if I spend some time in a Library I could probably find it - but ...

RE: Mass diffusivity of Gasoline Vapour in Air

Don't have any data on C7 but the following is from the CRC Handbook of Tables for Applied Engineering Science, 2nd edition, page 546

Diffusion coefficients are in ft2/hr at 0C and 25C and 1 atm.

Benzene, 0.291 and 0.341
n-butyl alcohol, 0.272 and 0.348
Xylene, 0.228 and 0.271
n-octane, 0.195 and 0.232

n-octane is reasonably close I would expect to C7, depending how accurate you need it.  Sorry, that's all the data I have.

RE: Mass diffusivity of Gasoline Vapour in Air


Diffusion coefficients of gases depend on average molecular speeds, thus are related to temperature. They are apparently proportional to Tn/P. Where T is absolute temperature, P total pressure, and n seems to vary.

Tabulated values of n for air, helium and hydrogen, 1.6-1.75; for CO2 and water vapor, around 2.1; for ammonia vapors, 2.2 . Following Gilliland (1934) n = 1.5; Perry VI, n = 1.75.

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