Mixing time and fluid flow phenomena in liquids of varying kinematic viscosities agitated by bottom gas injection |
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| Authors: | Manabu Iguchi Kei-Ichi Nakamura Ryoji Tsujino |
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| Affiliation: | (1) the Division of Materials Science and Engineering, Graduate School of Engineering, Hakkaido University, 060 Hokkaido, Japan;(2) Present address: Department of Materials Science and Processing, Osaka University, 565 Osaka, Japan;(3) Steelmaking Section, Wakayama Works, Sumitomo Metal Industries Ltd., 690 Wakayama, Japan;(4) the Department of Mechanical Engineering, Osaka Institute of Technology, Junior College, 535 Osaka, Japan |
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| Abstract: | A model experiment was carried out to investigate the mixing condition and related fluid flow phenomena in a slag layer of
metal-refining processes agitated by bottom gas injection. Silicone oil was used as a model for the molten slag. Mixing time
in a silicone oil bath was measured with a newly developed laser optical sensor. Measured mixing time values increased with
an increase in the kinematic viscosity of the silicone oil. In order to explain the relation between mixing time and the kinematic
viscosity of silicone oil, the rising velocity of bubbles and the vertical and horizontal velocities of silicone oil flow
were measured with an electroresistivity probe and a laser Doppler velocimeter, respectively. The increase in the mixing time
with the kinematic viscosity of silicone oil was caused mainly by the suppression of upward motion of bubbles and silicone
oil in the bubbling jet region. An empirical correlation for the mixing time was derived as a function of the kinematic viscosity
of silicone oil, in addition to conventionally used parameters such as the gas flow rate, bath diameter, and bath depth. |
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