The effect of nozzle shape and configuration on bubble formation in a liquid cross flow

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Proceedings titleAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
ConferenceASME 2012 Fluids Engineering Division Summer Meeting, FEDSM 2012 Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and M, FEDSM 2012, 8 July 2012 through 12 July 2012, Rio Grande
Pages12051209; # of pages: 5
SubjectBubble velocities; Cross-flow direction; Gas and liquid flows; Gas to liquids; High speed imaging; Image processing algorithm; Low-intensity; Two-dimensional profiles; Bubble formation; Chemical plants; Flow rate; Heat transfer; High speed cameras; Image processing; Light sources; Microchannels; Nozzles; Two dimensional; Liquids
AbstractGas injection into a liquid cross flow from a nozzle causes bubble formations which have potential applications in industry such as chemical plants, waste water treatment and bio- and nuclear-reactors. The purpose of this study is to experimentally investigate the effects of nozzle shape and configuration with respect to the liquid cross-flow direction, on the bubbly flow characteristics such as bubble formation, detached bubble size and frequency at different gas and liquid flow rates. The experiments were conducted in a Plexiglas two-dimensional rig using a high speed camera. High speed imaging and an image processing algorithm were used to track each individual bubble and to quantify the bubble growth as well as the detachment frequency and the bubble velocity. Back light shadowgraphy which utilizes a low intensity diffuse light source to illuminate the background was used to image bubbles. Nozzles were mounted in the test section which was designed such that the flow in this section has a two-dimensional profile. The results showed that the bubble size increases with an increase in GLR (gas to liquid flow rates ratio). Furthermore, the bubble formations and detached bubble size were strongly influenced by the nozzle shape and configuration. Copyright © 2012 by ASME.
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AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21269503
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Record identifier9e9acfb0-64c2-432e-b952-75b4acaa48c5
Record created2013-12-12
Record modified2016-05-09
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