Enhancing Boiling and Explosive Breakup of Evaporating Heterogeneous Water Drops in High Temperature Gaseous Media

Resumo

The influence of the passive method of heat transfer enhancement by increasing of the surface area of solid inclusions in water drops, on the conditions and characteristics of their boiling and breakup in conditions of intensive vaporization, was experimentally studied. Moreover, the main characteristics of these processes were defined: heating time of a drop till breakup, number and total surface area of formed droplets in comparison with the initial one (before breakup), limiting (critical) temperatures of sustainable (controlled) breakup of water drops. The substantial influence of artificial surface irregularities, porous surface geometry before and after water vaporization and inclusion shape (using the example of an irregular shape polyhedron and a cube) on the enhancement of heat-exchange processes in the water drop – solid inclusion system and the initiation of the explosive breakup of the liquid film of a heterogeneous drop was also demonstrated. Horizons of the explosive breakup application were distinguished for systems of thermal and flame purification of water from impurities, manufacturing a syngas from water solutions, emulsions and suspensions.