Journal
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
Volume 28, Issue 10, Pages 1243-1250Publisher
SPRINGER
DOI: 10.1007/s42243-021-00609-y
Keywords
Gas injection refining; Mechanical stirring; Mg desulfurization; Bubble breakage; Bubble dispersion; Dimensional analysis
Categories
Funding
- Key Technologies Research and Development Program [2017YFC0210404, 2017YFC0210403-04]
- National Natural Science Foundation of China [U1760120, U1710257, U1702253, U1903129]
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Water model experiments were conducted to investigate bubble behavior under centric mechanical stirring in cylindrical and square vessels. The results showed that centric mechanical stirring in the square vessel was suitable for breaking and dispersing bubbles, while not suitable for that in the cylindrical vessel. Increasing impeller blade length and rotation speed helped to disintegrate and disperse bubbles widely.
Water model experiments were carried out to investigate the bubble behavior in cylindrical and square vessels under centric mechanical stirring. The bubble behavior in the square vessel was investigated in detail by using a high-speed camera to record the transient images of the bubbles. An image analysis software was used to obtain the bubble diameter. The results showed that the centric mechanical stirring in the square vessel was suitable for breakage and dispersion of bubbles, but not suitable for that in the cylindrical vessel. Increasing the impeller blade length and impeller rotation speed was beneficial to disintegrate and disperse bubbles widely. The bubble diameter decreased with the increase in the Weber number and increased slightly with the increase in the modified Froude number. The dimensionless correlation equation of bubble diameter was obtained by the dimensional analysis method.
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