Two-phase flows involving a carrier gas laden with a dispersed phase composed of a large number of solid particles or liquid drops occur in many natural and technological applications. The engines that propel missiles, jets, and many other devices must rely heavily on combustion in a two-phase environment. Within the combustion chamber, the liquid fuel, which is first atomized into small drops, undergoes evaporation and reaction with the oxidizer gas. The isolated drop combustion model results predict increasing temperature as size is reduced, which is contrary to the industrial experience. Gaseous combustion can be described through continuum transport equations for mass fractions of various species that participate in the chemical reaction. Evaporation and combustion of a single drop are among the fundamental processes in liquid-fuel combustion and have been studied extensively since the pioneering works of D. B. Spalding and G. A. E. Godsave.