Droplet evaporation in high temperature environments
Abstract
Water droplet heat and mass transfer were determined numerically and experimentally for the case of high temperature environments. Radiative absorption was computed by ray tracing including polarization, refraction, external reflection, and multiple internal reflections. A modified Snell's law with real angles was used so that volumetric heating was computed as a function of radial position. For water droplet diameters on the order of 1 mm, the absorption of thermal radiation is largely confined to a thin layer near the droplet surface, the effective absorptance values are about 90 percent, and the reflectance is about 7 percent. For high black body radiating temperatures and for small droplets, the absorptance is smaller. The effects on droplet convective heat transfer of (1) blowing due to evaporation, (2) variable fluid properties, and (3) binary diffusion with nonequal heat capacities were estimated numerically with stagnation point solutions.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1980
- Bibcode:
- 1980PhDT........68H
- Keywords:
-
- Drops (Liquids);
- Heat Transfer;
- High Temperature;
- Mass Transfer;
- Evaporation;
- Ray Tracing;
- Fluid Mechanics and Heat Transfer