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A Study on the Vertical upward Bubble Flow using Image Processing Technique  

서동표 (조선대학교 대학원 정밀기계학과)
오율권 (조선대학교 기전공학과)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.27, no.5, 2003 , pp. 617-623 More about this Journal
Abstract
In the present study, the characteristics of upward bubble flow were experimentally investigated in a liquid bath. The velocity of upward bubble flow was calculated for two different experimental conditions：1) bubble flow without kinetic energy 2) bubble flow with kinetic energy. Bubble flow without kinetic energy starts to undergo the effect of buoyancy l0cm away from the nozzle. Whereas. kinetic energy is dominant before 30 cm away from the nozzle in bubble flow but after this point kinetic energy and inertial force are applied on bubble flow at the same time In addition, as the flow rate increases the maximum velocity point moves to the nozzle. The velocity Profiles near free surface is extremely irregular due to surface flow. Gas volume fraction is high near the nozzle due to gas concentration. but decreases with the increasement of axial position. Gas volume fraction does not vary after the axial position, z=60 in spite of the increasement of flow.
Keywords
Bubble Rise Velocity; Gas Volume Fraction; Free Surface; Electro-Conductivity Probe;
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