Periodic cavitation shedding in a cylindrical orifice |
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Authors: | C Stanley T Barber B Milton G Rosengarten |
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Institution: | (1) School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, 2052, Australia |
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Abstract: | Cavitation structures in a large-scale (D = 8.25 mm), plain orifice style nozzle within a unique experimental rig are investigated using high-speed visualisation and
digital image processing techniques. Refractive index matching with an acrylic nozzle is achieved using aqueous sodium iodide
for the test fluid. Cavitation collapse length, unsteady shedding frequency and spray angles are measured for cavitation conditions
from incipient to supercavitation for a range of Reynolds numbers, for a fixed L/D ratio of 4.85. Periodic cavitation shedding was shown to occur with frequencies between 500 and 2,000 Hz for conditions in
which cavitation occupied less than 30% of the nozzle length. A discontinuity in collapse length was shown to occur once the
cavitation exceeded this length, coinciding with a loss of periodic shedding. A mechanism for this behaviour is discussed.
Peak spray angles of approximately θ ≈ 14° were recorded for supercavitation conditions indicating the positive influence
of cavitation bubble collapse on the jet atomisation process. |
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Keywords: | |
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