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      Numerical Simulation and Prediction of Polymer Flammability in Non-Standard Conditions

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      https://www.riss.kr/link?id=E686517

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      Fire safety of plastics is commonly characterized in terms of Oxygen Index (OI), or the limit oxygen concentration in oxidizing atmosphere that supports combustion OI is determined in normal conditions (atmospheric pressure, room temperature, etc.) according to the procedure prescribing the ambient conditions, number of samples, their dimensions However, polymer materials and products where they are used meet the variety of ambient conditions, low and high temperatures, pressures, flow velocities, accelerations, and etc The methods of prediction of polymer flammability and OI in the wide range of operating conditions have not been available until now In this study, a mathematical model is worked out and the theory of limits of polymer combustion is developed to predict OI and other critical values in non-standard conditions pressure 0.1-100 atm, initial temperature of polymer 250-550 K, gravity force acceleration 0.1-50 g ; velocity of oxidizing O_2/N_2 stream 0-50 m/sec ; different thickness of polymer layers covering the cold base and their simultaneous action The model involves two-dimensional numerical simulation of the diffusion combustion of a polymer in the presence of eat losses The main factor the be taken into account is the decrease of flame temperature due to the cooling effect of different agents Therefore, the extinction criterion and OI are expressed in terms of the relationship between Damko¨hler and Peclet numbers Two critical conditions, observed earlier in the experiments on polymer extinction limits, are explained The predictions of the model were tested for PMMA and were found to be in good agreement with experimental data available
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      Fire safety of plastics is commonly characterized in terms of Oxygen Index (OI), or the limit oxygen concentration in oxidizing atmosphere that supports combustion OI is determined in normal conditions (atmospheric pressure, room temperature, etc.) ac...

      Fire safety of plastics is commonly characterized in terms of Oxygen Index (OI), or the limit oxygen concentration in oxidizing atmosphere that supports combustion OI is determined in normal conditions (atmospheric pressure, room temperature, etc.) according to the procedure prescribing the ambient conditions, number of samples, their dimensions However, polymer materials and products where they are used meet the variety of ambient conditions, low and high temperatures, pressures, flow velocities, accelerations, and etc The methods of prediction of polymer flammability and OI in the wide range of operating conditions have not been available until now In this study, a mathematical model is worked out and the theory of limits of polymer combustion is developed to predict OI and other critical values in non-standard conditions pressure 0.1-100 atm, initial temperature of polymer 250-550 K, gravity force acceleration 0.1-50 g ; velocity of oxidizing O_2/N_2 stream 0-50 m/sec ; different thickness of polymer layers covering the cold base and their simultaneous action The model involves two-dimensional numerical simulation of the diffusion combustion of a polymer in the presence of eat losses The main factor the be taken into account is the decrease of flame temperature due to the cooling effect of different agents Therefore, the extinction criterion and OI are expressed in terms of the relationship between Damko¨hler and Peclet numbers Two critical conditions, observed earlier in the experiments on polymer extinction limits, are explained The predictions of the model were tested for PMMA and were found to be in good agreement with experimental data available

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      목차 (Table of Contents)

      • Abstract
      • 1. Introduction
      • 2. Fundamentals of diffusion Combustion of Polymers
      • Abstract
      • 1. Introduction
      • 2. Fundamentals of diffusion Combustion of Polymers
      • 3. Mathematical Model of Polymer Combustion near Extinctions Limits
      • 4. Calculation of Oxygen Index
      • 5. Results
      • 6. Conclusion
      • References
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