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초록· 키워드

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Submerged gas-injected system can be applied to various industrial fields such as metallurgical and chemical processes. When gas was injected into a cylindrical bath which is filled with liquid. bubbles-liquid plume started to take a shape of a cone, being symmetry to the axial direction of injection and in a shape of can. In present study, characteristics of bubbles were investigated in air-water system. The dimension of cylindrical bath were 300㎜ diameter and 300㎜ height. The height of water was 200㎜ and the free surface was exposed to atmosphere. In bubbles-liquid plume, there were three important flow patterns. At the vicinity of air injection nozzle. the flow becomes irregular due to kinetic energy of air and the flow variables show radical change. Most of kinetic energy of gas was transferred to liquid and the flow pattern showed a form of Churn flow. The injected air lost its kinetic energy and then governed by the effect of buoyancy. In this region, the bubbles move upward with relatively uniform velocity and separate. In the free surface, the surface began to fluctuate due to collapse of bubbles.
Near the injection nozzle, gas volume fraction and bubble frequency were the highest. But it started to decrease as the axial and the radial distance increased. showing a Gaussian distribution.

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2. 이론해석

3. 실험장치 및 방법

4. 결과 및 고찰

5. 결론

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UCI(KEPA) : I410-ECN-0101-2009-553-015400712