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Comparing Predictions of Thermal Theory of Flame Propagation and Density Theory of Flame Propagation

Rafiee Oskouee, Aylean | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55195 (03)
  4. University: Sharif University of Technolog
  5. Department: Chemistry
  6. Advisor(s): Nassimi, Ali Mohammad
  7. Abstract:
  8. A significant portion of the substances used in the chemical industry are toxic and hazardous, posing major safety hazards. In this regard, studies on the flammability limits of flammable materials are important and necessary. Flammability limits are the range of fuel-oxidant mixtures that can lead to flame propagation. This project examines the flammability limits of different fuels. In this study, a set of fuels have been selected as the fuel world, and to select these compounds, their molecular structure as well as thermodynamic properties such as standard enthalpy of formation and standard enthalpy of combustion have been considered. It has been shown that by redefining the fuel world, the concentration around the mean for the density factor and the adiabatic flame temperature for the various combinations at lower and upper flammability. Flammability limits in this project have been predicted using density theory of flame propagation and thermal theory of flame propagation. Thermal (Density) theory suggests the existence of a theoretical threshold temperature (theoretical threshold density coefficient). Using the theoretical threshold temperature diagrams (theoretical threshold density coefficient) versus the equivalence ratio and the relationship between the equivalence ratio and the flammability limits in terms of volume percentage, the flammability limits can be predicted. According to the results, predicting the upper flammability limit using density theory and predicting the lower flammability limit using the thermal theory is recommended
  9. Keywords:
  10. Adiabatic Flame Temperature ; Density Factor ; Upper Flammability Limit ; Lower Flammability Limit ; Flame Propagation ; Thermal Analysis ; Density Based Method

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