RT Journal Article ID 4b7e12ab48d45ab2 A1 Leboucher, Nicolas A1 Roger, Francis A1 Carreau, Jean-Louis T1 DISINTEGRATION PROCESS OF AN ANNULAR LIQUID SHEET ASSISTED BY COAXIAL GASEOUS COFLOW(S) JF Atomization and Sprays JO AAS YR 2010 FD 2011-02-23 VO 20 IS 10 SP 847 OP 862 K1 break-up mechanisms K1 high-speed visualizations K1 instability frequencies AB The disintegration process of an annular liquid sheet assisted by inner and outer swirling gas jet(s) under different ambient pressures is studied for the design of new injectors in cryogenic propulsion. In such a geometry, the effect of ambient pressure has never been reported before. The liquid used is water and the gas used is air. Determination of the gas swirl intensity at the injector exit commands an intensive study, taking into account experimental results obtained in a similar configuration. The motion is captured using a very high speed camera at a rate of 12,500 and 14,000 fps. Four break-up mechanisms, namely, "bubble train," "bubble breakup," "pure-pulsating," and "Christmas tree," have been identified. The flow map of these regimes, governed by the momenta of the liquid and the gas, has been carried out and the results have been found to be in good agreement with the literature. At the end of this article, the oscillation frequency of the liquid sheet is related to the injector exit conditions, gas and liquid velocities, gas densities, and gas swirl intensities. PB Begell House LK https://www.dl.begellhouse.com/journals/6a7c7e10642258cc,706691d14834697d,4b7e12ab48d45ab2.html