New method for determining the evaporation rate of single levitating drop at radiant heat flux has been proposed. The results of experimental study of the evaporation rate of distilled water drop upon heating by radiant and convective heat flux in the range of q = (0.25–1.5) W/cm^2 are presented. Comparative analysis of the features of the drop evaporation during radiant and convective heating has been carried out.

The technique and results of an experimental study of the effect of the surface tension coefficient and the initial volume of a water core on the dynamics of its destruction at free settling in air with a non-zero initial velocity are presented. It is shown that the distance over which the water core completely collapses with the formation of the cloud of droplets decreases by 30% at two-fold decrease in the surface tension coefficient of a liquid. It is shown that the dependence of distance of complete destruction on the initial core volume has a minimum.