High mass flux evaporation

Experimental data for the evaporation of water, ethyl ether, dichloromethane, carbon tetrachloride, acetone and n-octane into a stagnant atmosphere at different temperatures are reported. A model for the evaporation process is presented. The calculation of the wet bulb temperatures is strongly dependent on the Lewis number and on the high mass flux conditions present. The calculated and experimental high mass flux transfer coefficients differ by an average of ± 10.5% provided the dimensionless groups Sh, Nu, Pr, Sc, Le and Gr are evaluated at surface temperature conditions except for the density in the Grashof number which is evaluated at bulk conditions. The theory incorporates Hanna's density variation factor.