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A Study on the Characteristics of Two-Phase Flow by Driven Bubbles in a Liquid Bath  

Oh, Yool-Kwon (Department of Mechanical Engineering, Chosun University)
Seo, Dong-Pyo (Graduate School, Chosun University)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.13, no.1, 2005 , pp. 44-50 More about this Journal
Abstract
In the present study, the characteristics of upward bubble flow were experimentally investigated in a liquid bath. An electro-conductivity probe was used to measure local volume fraction and bubble frequency. Since the gas was concentrated at the near the nozzle, the flow parameters were high near the nozzle. In general their axial and radial values tended to decrease with increasing distance. For visualization of flow characteristics, a Particle Image Velocimetry (PIV) and a thermo-vision camera were used in the present study. The experimental results showed that heat transfer from bubble surface to water was largely completed within z = 10 mm from the nozzle, and then the temperature of bubble surface reached that of water rapidly. Due to the centrifugal force, the flow was more developed near the wall than at bubble-water plume. Vortex flow in the bottom region was relatively weaker than that in the upper region.
Keywords
Electro-resistivity probe; Local gas volume fraction; Bubble frequency; Infrared thermo vision camera; PIV(Particle image velocimetry);
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  • Reference
1 Johansen, S. T., Robertson, D. G. C., Woje, K. and Engh, T. A., 1988, Fluid dynamics in bubble stirred ladles, Part I: Experiments, Metallurgical Transactions B, Vol. 19B, pp. 745-754
2 Johansen, S. T. and Boysan, F., 1988, Fluid dynamics in bubble stirred ladles, Part II: Mathematical modeling, Metallurgical Transactions B, Vol. 19B, pp. 755-764
3 Castillejos, A. H. and Brimacombe, J. K., 1986a, Measurement of physical characteristics of bubbles in gas-liquid plumes, Part I: An improved electro-resistivity probe technique, Metallurgical Transactions B, Vol. 18B, pp. 649-658
4 Turkoglu, H., 1990, Transport processes in gas-injected liquid baths, Ph. D. Thesis, Drexel University, Philadelphia
5 Sohn, H. C., 2000, A study on the flow characteristics of developing turbulent steady, turbulent oscillatory and turbulent pulsating flows in the entrance region of a curbed duct, Ph. D. Thesis, Chosun University, Korea
6 Castillejos, A. H. and Brimacombe, J. K, 1986b, Measurement of physical characteristics of bubbles in gas-liquid plumes, Part II: Local properties of turbulent air-water plumes in vertically injected jets, Metallurgical Transactions B, Vol. 18B, pp. 659-671
7 Castillejos, A., 1986, A study of the fluid-dynamic characteristics of turbulent gasliquid bubble plumes, Ph. D. Thesis, The University of British Columba, Canada