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CFD and Dispersion modeling applied to Hazardous Area Classification

Tarjoman Nejad, Ali | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43292 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Rashtchian, Davood
  7. Abstract:
  8. Gas leak explosion is major risks in closed environment in the chemical industry. One of the fundamental principles of safety is control of ignition sources using special protective equipment in areas where possible flammable gases or vapors are there. Computational fluid dynamics is used in this project to evaluate and analyze the risks associated with gas distribution. Ventilation effect has been studied by computational fluid dynamics on gas cloud formed by leakage of flammable in hazardous areas. To demonstrate the accuracy of calculations performed by computational fluid dynamics, the results are validated by experimental data. The simulated results for gas dispersion are found to be in good agreement with the experimental data. Natural and mechanical ventilation have been studied. Effects of ventilation on the volume of a flammable gas cloud and the volume of ventilation and gas density have been studied. Hydrogen, ethylene and butane have been studied. Choosing of inappropriate ventilation port and poor ventilation causes rotational flow and stagnant areas and increase the volume of the flammable gas cloud. According to the results, the gas density has a significant impact on the performance of ventilation, so location and ventilation rate is very effective on the volume of gases lighter than air cloud, but with increasing density, this effect is reduced. Another result obtained from this study, is usefulness and efficiency of CFD in the classification of hazardous areas.
  9. Keywords:
  10. Diffusion Model ; Computational Fluid Dynamics (CFD) ; Ventilation ; Hazardous Area Classification

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