低温熱水の膨張による高速ミスト流生成の基礎的研究

抄録

An experimental study on production of high-speed mist Flow by expansion oFlow temperature hot water through convergent-divergent nozzles has been carried out. The effect of the nozzle divergent angle was investigated, and inlet swirl effect was also studied. Pressure and temperature distributions along nozzles, droplet's velocity and diameter, and droplet's entrainment ratio were measured. It was found that two kinds of Flow pattern exist after the nozzle throat, namely liquid jet type in high Flow rate case and annular liquid film type in low Flow rate case, and have higher velocity as the nozzle divergent angle is smaller. The same trend was obserbed as amount of swirl was increased. Finally, energy conversion efficiency was compared among all conditions.