Abstract
A new method for unsteady simultaneous measurements of velocities and diameters of an evaporating volatile liquid drop was proposed by using an optical method with application of a microcomputer technique. Unsteady measurements of the drag coefficient and dimensionless diffusion flux of a pentane drop falling freely in air at atmospheric pressure in intermediate temperature ranges were made and compared with the theoretical ones proposed in our previous papers. The behavior of a volatile drop falling freely in air was well explained by a simulation technique with due consideration to the high mass flux effect.
