Study on characteristics of air entrainment into seawater due to nappe for design of de-aeration chamber

(Volume and size distribution of air bubbles generated in seawater due to nappe from weir)

Abstract

From the viewpoint of an environmental conservation, it is often required to eliminate air bubbles in cooling seawater discharged from process plants to sea area. The air bubbles are generated due to a nappe from a weir. A de-aeration chamber is one of technology to eliminate the air bubbles. For the design, a volume and size distribution of air bubbles in seawater are essential engineering information, however, few quantitative investigations are carried out. Therefore, the volume and size distribution of air bubbles generated due to the nappe were measured for seawater and tap water, and it was found that the size of air bubbles in seawater became smaller than that in tap water, etc.