Iranian Journal of Science and Technology-Transaction B: Engineering, ( ISI ), Volume (29), No (2), Year (2005-4) , Pages (207-218)

Title : A transient two-dimensional model of thermal and oxidative degradation of PMMA ( A transient two-dimensional model of thermal and oxidative degradation of PMMA )

Authors: Javad Abolfazli Esfahani , Mohammad Bagher Ayani , - - ,

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In the present work, numerical computations of the flow and thermal fields have been carried out for a transient, two-dimensional model of thermal and oxidative degradation of polymethylmethacrylate (PMMA) subjected to a monochromatic, radiant heat flux. An external thermal radiation source is used to simulate the primary mode of energy transfer in a room fire. An incompressible SIMPLE code is used with a staggered grid arrangement. The equations for the fluid and solid (fuel) phases are solved simultaneously using a segregated technique. At the outlet of the computational domain a convective boundary condition is compared with a traditional Neumann condition. The convective boundary condition is shown to be more effective in reducing the CPU time. A study in the effects of spatial resolution and different time steps are provided. A theory is developed to account for thermal and oxidative degradation. The theory is based on differences in polymer degradation behavior in inert and non-inert environments. A number of quantities such as surface temperature and mass flux of PMMA are calculated by an external source of 40 kW/m2. The predictions of the model are in a good agreement with the experimental results. It is found that an increase in gas-phase oxygen concentration obviously decreases the surface temperature and increases the gasification rate of PMMA.

Keywords

, Thermal and oxidative degradation, polymers, PMMA, gasification rate, in-depth
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@article{paperid:203010,
author = {Abolfazli Esfahani, Javad and Ayani, Mohammad Bagher and -, -},
title = {A transient two-dimensional model of thermal and oxidative degradation of PMMA},
journal = {Iranian Journal of Science and Technology-Transaction B: Engineering},
year = {2005},
volume = {29},
number = {2},
month = {April},
issn = {1028-6284},
pages = {207--218},
numpages = {11},
keywords = {Thermal and oxidative degradation; polymers; PMMA; gasification rate; in-depth absorption},
}

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%0 Journal Article
%T A transient two-dimensional model of thermal and oxidative degradation of PMMA
%A Abolfazli Esfahani, Javad
%A Ayani, Mohammad Bagher
%A -, -
%J Iranian Journal of Science and Technology-Transaction B: Engineering
%@ 1028-6284
%D 2005

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