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Experiments on Air Entrainment due to Free Falling- and Wall-Jets

[+] Author Affiliations
Jose M. Lopez, Ram Mohan

The University of Tulsa, Tulsa, OK

Dana V. Danciu, Marco J. Da Silva, Uwe Hampel

Forschungszentrum Dresden Rossendorf, Dresden, Saxony, Germany

Paper No. FEDSM-ICNMM2010-30789, pp. 283-291; 9 pages
doi:10.1115/FEDSM-ICNMM2010-30789
From:
  • ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels
  • ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 2, Fora
  • Montreal, Quebec, Canada, August 1–5, 2010
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4949-1 | eISBN: 978-0-7918-3880-8
  • Copyright © 2010 by ASME

abstract

In this article, air entrainment as a result of an impinging round water jet and a wall-jet was experimentally studied by means of videometry and image processing methods and also by means of a measurement technique based on a wire-mesh sensor. Therefore, two different experimental setups were utilized. For the first setup, a series of experiments at different conditions was performed and evaluated for both round jets and wall-jets. Jet lengths ranged between 0.01 and 0.2 m and jet exit velocities between 0.9 and 3.5 m/s. Image processing algorithms were applied to extract information about jet penetration depth, width of the bubble plume and bubble size distribution. The second facility was used to create a falling film in a square pipe (5 cm × 5 cm). Downstream of the impact point, a wire-mesh sensor was used to measure the gas entrainment characteristics at one axial location. Video image processing was also used in this experiment to gather more qualitative information about the gas entrainment process. Video images are compared with the images obtained by the wire-mesh sensor showing good qualitative agreement. The induction trumpet and a thin sheet of gas that forms around the jet and penetrates into the pool causing the entrainment were clearly identified. Results indicate that the gas void fraction increases and the bubble size decreases as the superficial liquid velocity increases.

Copyright © 2010 by ASME
Topics: Jets

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