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Experimental Study of Simple Orifice Geometry Variation on Liquid Jet Disintegration in a Gaseous Cross Flow

Khosrobeygi, Hamed | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45822 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Morad, Mohammad Reza
  7. Abstract:
  8. In this thesis, elliptical liquid jet breakup in crossflow has been investigated. To do this, two elliptical nozzle with different aspect ratio were built. First, the effective and important dimensionless numbers were extracted. Then, the physical aspect of the question was analyzed. All the experiments have been done in atmospheric conditions with water fluid, air as the liquid jet, and gas crossflow respectively.To create crossflow, a square cross section channel and one blower which are set in the beginning of the channel were made use of. Water is injected into air crossflow by the injector installed under the channel. The system used in revealing the crossflow is shadowgraphy system. At first, we performed the tests in the still air to know the oval jet behavior better. In these tests, breakup and the axis switching phenomena mechanisms were observed. Afterwards, different kinds of liquid jet breakup mechanisms and three breakup samples were seen in the experiment area.The effects of dimensionless numbers in the question have been probed in both conditions. The most paramount parameter in the still air is the jet Weber number that its increase causes the increase in axis-switching wavelength. Gas Weber number controls the breakup mechanism in crossflow. The momentum ratio, which is defined as liquid momentum on gas momentum in crossflow, has a direct influence on depth of penetration
  9. Keywords:
  10. Refraction ; Weber Number ; Cross Flow ; Liquid Jet ; Elliptical Nozzle ; Axis-Switching ; Momentum Ratio

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