1994 年 14 巻 54 号 p. 185-190
A buoyancy-driven exchange flow through an opening in a partition can be induced by density difference between the gases of each side. The exchange flow rate and flow behavior depend on the density difference and the geometric configuration of the opening. The geometry of the opening is characterized by its diameter, length and inclination angle.
This paper describes an experimental study on the buoyancy-driven exchange flow between helium filled in a chamber and the outside air through a small opening by means of visualization. The opening with large length-to-diameter ratio appears at the top of the chamber. Buoyancy-driven exchange flows through the opening are visualized by making use of laser-light-sheet technique. The results of visualization show exchange flow behavior by turbulent diffusion and its transition to stratified flow caused by increasing of inclination angle of the opening.
Key words : Buoyancy-driven Exchange Flow, Visualization, Laser-light-sheet Technique, Turbulent Diffusion, Stratified Flow