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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v18.i8.20
pages 699-722

DEVELOPMENT OF AN EXPERIMENTAL METHOD TO EVALUATE THE STABILITY OF GAS-LIQUID SPRAYS

S. Maldonado
Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8
Brian A. Fleck
Mechanical Engineering Department, University of Alberta, 4-9 Mechanical Engineering Building, Edmonton, AB, T6G 2G8, Canada
T. Heidrick
Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8
Alidad Amirfazli
Department of Mechanical Engineering, York University, Toronto, Ontario, Canada M3J 1P3
E. W. Chan
Syncrude Canada Research Centre, Edmonton, Alberta, Canada T6N 1H4
B. Knapper
Syncrude Canada Research Centre, Edmonton, Alberta, Canada T6N 1H4

ABSTRAKT

An experimental investigation was performed to characterize the stability of gas-liquid sprays. An industrial-scale testing system was used, in which water and air were mixed upstream and flowed through a feeding pipe to the nozzle. Numerous flow conditions within the range of 1−4 kg/min of air and 75.7−181.7 kg/min of water were considered, for three different feeding pipe lengths (LD = 16, 41, 74). The spray stability was characterized based on the analysis of the wall pressure fluctuations in the amplitude, time, and frequency domains. A parameter based on the mean square value of the pressure fluctuations for frequencies below 40 Hz was used to quantify the spray stability. High-speed videos showed the flow pattern entering the nozzle, directly affecting the spray stability, with dispersed-bubble and intermittent flow yielding stable and unstable sprays, respectively. Different lengths of feeding pipes affected the stability through changes to the equilibrium condition (i.e., flow development) of the two-phase flow entering the nozzle.


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