Abstract
Recently, in the resolution process of organic chloric compounds such as Freon, malignant wastes such as dioxin are generated. To achieve a complete resolution system, the gas absorption of organic chloric compound gas into molten salt has been developed. Several kinds of gas injection methods have been studied, and one of the applicable methods of gas injection is to use a vertically downward nozzle. However, there are few studies on bubble formation from the downward nozzle. The purpose of the present study is to investigate the effect of nozzle shape and operating parameters on bubble formation mechanism from the vertically downward nozzle. In this study, nitrogen gas was used as the model gas instead of the organic chloric compound gas, and distilled water, glycerol aqueous solutions and dodecylbenzene sodium sulfonic acid aqueous solutions were used as the model liquids instead of the molten salt. The bubbles formed at the nozzle tip were recorded by a high speed video camera. The bubble volume was calculated by the gas flow rate and interval of bubble formation which was analyzed by an image analyzer. We studied the effect of several factors, such as the shape of nozzle, gas flow rate, gas chamber volume and physical properties of liquids on bubble formation mechanism. As a result, the bubble formation and the bubble size were influenced by the edge angle of nozzle, nozzle diameter and gas flow rate, whereas the gas chamber volume and surface tension hardly influenced on the bubble size.
