The effects of the blocking ratio and atmospheric altitude on starting annular air jets at a low Reynolds number are investigated by examining the velocity profiles, jet entrainment and vortex formation. A 2D axisymmetric numerical model is developed to perform the analysis. The numerical model is validated with theoretical and experimental results from other studies. In order to achieve a comprehensive analysis, the annular jet is tested for blocking ratios with the values of 0.00 (i.e. a round jet), 0.50 and 0.75. Air properties at altitudes of 0.00 km, 18.90 km and 33.75 km are tested to simulate atmospheric environments at sea level, edge of near space and near space, respectively. The results showed that the starting jet velocity profile, entrainment and vortex formation is a strong function of blocking ratio. On the other hand, the same parameters are shown to be nearly independent, strong and weak functions of atmospheric altitude, respectively.
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ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels
August 1–5, 2010
Montreal, Quebec, Canada
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4948-4
PROCEEDINGS PAPER
The Effects of Blocking Ratio and Atmospheric Altitude on Starting Annular Jets
Emad Abdel-Raouf,
Emad Abdel-Raouf
The University of Alabama, Tuscaloosa, AL
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John Baker,
John Baker
The University of Alabama, Tuscaloosa, AL
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Muhammad Sharif
Muhammad Sharif
The University of Alabama, Tuscaloosa, AL
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Emad Abdel-Raouf
The University of Alabama, Tuscaloosa, AL
John Baker
The University of Alabama, Tuscaloosa, AL
Muhammad Sharif
The University of Alabama, Tuscaloosa, AL
Paper No:
FEDSM-ICNMM2010-30767, pp. 279-287; 9 pages
Published Online:
March 1, 2011
Citation
Abdel-Raouf, E, Baker, J, & Sharif, M. "The Effects of Blocking Ratio and Atmospheric Altitude on Starting Annular Jets." Proceedings of the 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 1, Symposia – Parts A, B, and C. Montreal, Quebec, Canada. August 1–5, 2010. pp. 279-287. ASME. https://doi.org/10.1115/FEDSM-ICNMM2010-30767
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