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CFD-Modeling and Simulation of Droplets Evaporation With a Size Distribution Function

Pirhadi, Zahra | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47598 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Farhadi, Fatollah
  7. Abstract:
  8. Injecting several droplets with a known size distribution function in the hot gas environment makes droplets smaller because of evaporation or reaction. Droplets lifetime specification is important in vapor-liquid interactive processes such as chemical or process industries. In previous works, different approximate semi-empirical methods are developed to specify droplets lifetime without considering their size distribution. In this work, governing equations is studiedconsidering a size distribution function for droplets. There is not any analytical method for solving this set of equations, so numerical methods using CFD packages such as Fluent, are applicable in these cases. In this study, evaporation equations are studied at first, then a proper evaporation model is introduced for a single droplet. This model is evaluated by analyzing two case studies. The results show that this model can predict dynamic behavior of a single droplet evaporation properly. So this model is chosen to be used for evaporation of a spray with a known size distribution function. In this case, the effect of size distribution function parameters is studied. The results show that the higher spread parameter causes shorter droplets’ lifetime and the higher mean diameter causes longer droplets’ lifetime. Despite this qualitative comparison, droplets’ lifetime specification for a special case with a known size distribution function is possible, using the introduced evaporation model
  9. Keywords:
  10. Modeling ; Evaporation ; Size Distribution ; Computational Fluid Dynamics (CFD) ; Droplets Lifetime ; Spray Droplets

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