Proceedings of the Korean Society of Propulsion Engineers Conference (한국추진공학회:학술대회논문집)
- 2004.03a
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- Pages.173-179
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- 2004
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- 1975-342X(pISSN)
Breakup Characteristics of Laminar and Turbulent Liquid Sheets Formed by Impinging Jets in High Pressure Environments
- Jung, K. (School of Mechanical and Aerospace Engineering, Seoul National University) ;
- Khil, T. (School of Mechanical and Aerospace Engineering, Seoul National University) ;
- Lim, B. (School of Mechanical and Aerospace Engineering, Seoul National University) ;
- Yoon, Y. (School of Mechanical and Aerospace Engineering, Seoul National University)
- Published : 2004.03.01
Abstract
Breakup characteristics of liquid sheets formed by the impingement of two water jets, such as a breakup length and a breakup wavelength of sheet, were investigated as increasing the injection velocity up to 30m/s and the ambient gas pressure up to 4.0㎫. While round edged orifices formed a laminar sheet which has no waves on the sheet when the injection velocity is low, sharp edged orifices formed a turbulent sheet which has impact waves irrespective of the injection velocity. Thus we compared the differences of breakup characteristics between them. The results showed that the aerodynamic force significantly affects the breakup of laminar sheet when the gas based Weber number is higher than unity. It was also found that the turbulent sheets have three breakup regimes, i.e. expansion regime, wave breakup regime and catastrophic breakup regime according to the gas based Weber number.