An experimental study of boiling in dilute emulsions, part A: Heat transfer

摘要

Results are reported of an experimental study of heat transfer in pool boiling of dilute emulsions of pentane in water and FC-72 in water. Heat transfer coefficients for single phase convection, boiling of the dispersed component, and enhanced boiling of the continuous component are reported. Results show that the boiling heat transfer coefficient is a function primarily of superheat of both the dispersed component and contin uous component, sub-cooling of the bulk of the emulsion, and volume fraction of the dispersed component up to ～1%. Other properties of the dispersed component are relatively unimportant, as are the geometry of the heated surface and droplet size of the emulsion. Droplets of the dispersed component can accumulate on the heated surface, but this accumulation affects heat transfer only in single phase convection.