Study on Diffusion Behavior of Evaporative Fuel Gas from Gasoline Carbon Canister in Consideration of Temperature-Dependence 2011-32-0532

It is important to quantify the diffusion behavior of evaporative fuel gas in order to control evaporative emission from carbon canister. Especially, it is necessary to take the changes in adsorption-desorption amount and diffusion coefficients by air temperature into account to design carbon canister satisfying various conditions of air. In this study, we estimated diffusion coefficients in carbon canister for the binary system of butane and nitrogen and examined temperature-dependence of diffusion coefficients. The temperature dependence of diffusion coefficients was not clearly observed. Diffusion coefficient of gas phase increased as the temperature was higher. Amount of desorption decreased as the temperature was raised by contraries. Those effects made the complex temperature dependence of the diffusion coefficient. They caused the density increment and the flow caused by pressure simultaneously.