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http://dx.doi.org/10.3795/KSME-B.2015.39.1.061

Mixed Flow and Oxygen Transfer Characteristics of Vertical Orifice Ejector  

Kim, Dong Jun (Dept. of Automotive System Engineering, Chonnam Nat'l Univ.)
Park, Sang Kyoo (School of Mechanical Design Engineering, Chonnam Nat'l Univ.)
Yang, Hei Cheon (School of Mechanical Design Engineering, Chonnam Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.39, no.1, 2015 , pp. 61-69 More about this Journal
Abstract
The objective of this study is to experimentally investigate the mixed flow behaviors and oxygen transfer characteristics of a vertical orifice ejector. The experimental apparatus consisted of an electric motor-pump, an orifice ejector, a circulation water tank, an air compressor, a high speed camera unit and control or measurement accessories. The mass ratio was calculated using the measured primary flow rate and suction air flow rate with experimental parameters. The visualization images of vertically injected mixed jet issuing from the orifice ejector were qualitatively analyzed. The volumetric oxygen transfer coefficient was calculated using the measured dissolved oxygen concentration. At a constant primary flow rate, the mass ratio and oxygen transfer coefficient increase with the air pressure of compressor. At a constant air pressure of the compressor, the mass ratio decreases and the oxygen transfer coefficient increases as the primary flow rate increases. The residence time and dispersion of fine air bubbles and the penetration of mixed flow were found to be important parameters for the oxygen transfer rate owing to the contact area and time of two phases.
Keywords
Orifice Ejector; Mixed Flow; Mass Ratio; Dissolved Oxygen; Oxygen Transfer Coefficient; Visualization;
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Times Cited By KSCI : 2  (Citation Analysis)
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