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 ...
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
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.