Augmentation of boiling heat transfer from horizontal cylinder to liquid by movable particles

This paper presents a series of experimental results on the passive augment ation technique of boiling heat transfer by supplying solid particles in li quid. A cylindrical heater 0.88 mm in diameter is placed in saturated water , in which a lot of mobile particles exist, and the nucleate and film boili ng heat transfer characteristics are measured. Particle materials used were alumina, glass and porous alumina, and the diameter ranged from 0.3 mm to 2.5 mm. Particles are fluidized by the occurrence of boiling without any ad ditive power, and the heat transfer is augmented. The maximum augmentation ratio obtained in this experiment reaches about ten times the heat transfer coefficient obtained in only liquid. The augmentation ratio is mainly affe cted by the particle material, diameter, and the height of the particles be d set at no boiling condition. The augmentation mechanism is discussed on t he basis of experimental results.