2000 Volume 26 Issue 4 Pages 575-580
This paper presents a series of experimental results on the passive augmentation technique of boiling heat transfer by supplying solid particles in liquid. A cylindrical heater 0.88mm in diameter is placed in saturated water, in which a lot of mobile particles exist, and the nucleate and film boiling heat transfer characteristics are measured. Particle materials used were alumina, glass and porous alumina, and the diameter ranged from 0.3mm to 2.5mm. Particles are fluidized by the occurrence of boiling without any additive power, and the heat transfer is augmented. The maximum augmentation ratio obtained in this experiment reaches about ten times the heat transfer coeffcient obtained in only liquid. The augmentation ratio is mainly affected by the particle material, diameter, and the height of the particles bed set at no boiling condition. The augmentation mechanism is discussed on the basis of experimental results.