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http://dx.doi.org/10.3795/KSME-B.2011.35.8.855

Numerical Study of Effect of DAF-Tank Shape on Flow Pattern in Separation Zone of Dissolved Air Flotation  

Ryu, Gwang-Nyeon (Industrial Research Inst., R&D Div., Hyundai Heavy Industries)
Park, Sang-Min (Industrial Research Inst., R&D Div., Hyundai Heavy Industries)
Lee, Ho-Il (Industrial Research Inst., R&D Div., Hyundai Heavy Industries)
Chung, Mong-Kyu (Industrial Research Inst., R&D Div., Hyundai Heavy Industries)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.35, no.8, 2011 , pp. 855-860 More about this Journal
Abstract
We numerically simulated a dissolved air flotation (DAF) tank to predict the performance of the pilot facility. The flow was assumed to be two-dimensional and two-phase. The velocity distributions in the separation zones of differently shaped DAFs were compared to find the effect of the shape on the performance. The results showed that the typical flow pattern that appeared in a well-designed DAF-tank was generated in the separation zone of the base model. This flow pattern could be maintained while the baffle height was sufficiently tall regardless of the other geometric parameters. However, the baffle height and angle, the contact zone width, and the perforated plate affected the uniformity of the downward flow in the separation zone. Except for the baffle height, the base model used in this study showed a better uniformity of downward flow than did other models with different geometric parameters.
Keywords
DAF; Dissolved Air Flotation; Contact Zone; Separation Zone; Flow Pattern;
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