Diffusion coefficient of ethanol - gasoline blends in air

Abstract

Vapor diffusion was studied from volatile liquids of ethanol blend gasoline. The studying was conducted at two operating temperatures of 40 and 50 oC and blending of 0, 5, 10, 20, 30, 40, and 100 % by volume ethanol. The diffusion coefficients of the blend showed an increase in diffusion coefficient in air with increasing temperature and % of ethanol added. The diffusivity coefficient of gasoline -ethanol followed the following polynomial equations: Deff = 2E-05(% vol. ethanol)2 +7E-07 (% vol. ethanol) +5E-10 at 40 oC Deff = 5E -06(% vol. ethanol) - 1E-06((% vol. ethanol) + 2E-07 at 50 oC) The diffusion coefficient of the blend in both operating temperatures was increased sharply after the addition of 20% by volume of ethanol.