Modeling the acoustic effects on droplet vaporization in a laboratory pulse combustor

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Maghami, E. G ; Sharif University of Technology | 2000

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Type of Document: Article
Publisher: 2000
Abstract:
Both theoretical and experimental analysis of acoustics fields effects on droplet vaporization are presented. Theoretical investigation is based on droplet vaporization without combustion in both steady and longitudinal acoustic fields with variable properties in one dimension. An axisymmetric pulse combustor is developed for simulating the longitudinal acoustic field. A spray system is used for producing water droplets. Controllable parameters of the system are the hot air and liquid injection velocities, direction of injection and frequency of acoustic oscillation. The theoretical results indicate that the evaporation time decreases up to 30 percent in an acoustic field in comparison to steady condition. The experimental results at unsteady evaporation reveal that with increasing the frequency of acoustic field from 200 Hz to 700 Hz, the length of spray decreases from 3.9 cm to 2.9 cm. The length of spray decreases with increasing hot gas and injection velocity
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Source: American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED ; Volume 253 , 2000 , Pages 1077-1084 ; 08888116 (ISSN)