Effects of the Lewis number of water vapor on the combustion and extinction of methanol drops

A simplified model for the time-dependent, spherically symmetrical combustion and extinction of methanol droplets is extended to account for a Lewis number of water vapor different from unit. A parametric study is performed, showing that, with water absorption and good mixing in the liquid, the burning time and extinction diameter achieve maxima for water Lewis numbers slightly less than unity in the gas phase. At high Lewis numbers, the smaller...