Combustion - 國立中央大學機械工程學系

liquid, liquid/solid, or solid/liquid, then the combustion isheterogeneous (e.g. coal particle burning in air).• Chemists define a heterogeneous reaction as one in which the reactantsactually exist in different phases at the location where reaction takes place.•• Traditional combustion definition : Both modes of burning are calledheterogeneous combustion.• To designate the uniformity of the mixture.• Homogeneous ⎯ no temperature or concentration gradients in the mixture.• Heterogeneous ⎯ a gaseous mixture containing fuel vapor pockets produced,say, through vaporization of fuel droplets.15