The experimental procedure has been developed and studies using high-speed (105 frames per second) system of cross-correlation video registration of a change in the shape of drops for the most typical liquids that are widely used in various chemical technologies (water, kerosene, and ethyl alcohol) have been carried out. The liquids move with significantly subsonic speeds (up to 5 m/s) in the air environment under the influence of gravitational forces. The initial sizes of drops varied in the range of 3–6 mm. The cyclic nature of the changes in the shapes of drops during movement has been established. Characteristic times of transitions from one shape of drop to another have been measured. Characteristic times of the existence of drops in the form of spheres and ellipses have been defined. Recommendations about the use of geometrical models of liquid drops for theoretical study of heat and mass transfer and hydrodynamics in the course of their movement through gas environments under the conditions of moderate Weber numbers have been formulated.
ASJC Scopus subject areas
- Chemical Engineering(all)