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Experimental Study on Liquid Jet Disintegration in Gaseous Crossflow

Pourrousta, Mohammad Reza | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44013 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mazaheri, Karim; Morad, Mohammad Reza
  7. Abstract:
  8. In the present research, a test stand for investigating the behavior of an injected jet in cross flow, is established. In All experiments water and air was used as injected jet and cross flow respectively. At the beginning, with help of dimensional analysis, non-dimensional parameters are introduced and their effect of these parameter on the jet behavior, as the most important goal of this research, is investigated. In order to inject the fluid in the cross flow, two injector with 0.58 mm and 1.08 mm exit diameter and 10 mm exit length was used, and jet speed varies from 2 m/s to 12 m/s. The cross section of the wind tunnel was a 8cm-edge-square and the air speed was adjustable in the range of 2 m/s to 33.3 m/s. for providing a suitable rang of experiments, momentum ratio and Weber number are varied in range of 5 to 211 and 1.1 to 19.1, respectively. In this research, the shadowgraphy method is used for data acquisition and measurements. Jet column break up mechanism and jet path is investigated in different circumstances. One of the most important outcomes of this investigations is observing constant break up length to diameter ratio in conditions, also it is shown that jet break up height will increase by increasing momentum ratio. Three different kind of break up was observed in experiments, and it was shown that break up mechanism will vary by increasing Weber number, but the break up mechanism do not have a significant effect on jet path. Moreover the dependency of jet path to momentum ratio is investigated and it is shown that by increasing momentum ratio, the height of jet column will increase too. At the end, a correlation for jet path, for all test cases, is presented
  9. Keywords:
  10. Cross Flow ; Jet Trajectory ; Jet Break up ; Shadowgraphy Method

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