Influence of the form of a solid inclusion in an inhomogeneous liquid droplet on the conditions of its “explosive” destruction under intense heat exchange

Abstract

The boiling conditions at the interface in a water droplet (initial conventional diameter of 3–4 mm) with a solid nontransparent inclusion (characteristic sizes up to 2 mm) in a high-temperature (higher than 600 K) gas medium are distinguished by the results of experimental investigations with the use of highspeed (no less than 105 frames per second) video registration. The main stages of the process, such as liquid heating, evaporation from a free droplet surface, bubble boiling at internal interfaces between the media, bubble growth, bubble motion through the liquid film, and “explosive” decomposition of the droplet into a group of smaller droplets. The characteristic times of these stages and the influence of the inclusion form on them are established by the example of graphite particles (sphere, disc, cone, parallelepiped, and irregularly shaped polygon).