Next Article in Journal
Using Noise and Fluctuations for In Situ Measurements of Nitrogen Diffusion Depth
Previous Article in Journal
Surface Characterization, Corrosion Resistance and in Vitro Biocompatibility of a New Ti‐Hf‐Mo‐Sn Alloy
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessArticle
Materials 2016, 9(10), 820; doi:10.3390/ma9100820

Effects of Combined Surface and In‐Depth Absorption on Ignition of PMMA

1
College of Safety Science and Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China
2
Department of Fire Science & Professional Studies, University of New Haven, West Haven, CT 06516, USA
*
Author to whom correspondence should be addressed.
Received: 29 August 2016 / Accepted: 26 September 2016 / Published: 5 October 2016
View Full-Text   |   Download PDF [5053 KB, uploaded 12 October 2016]   |  

Abstract

A one‐dimensional numerical model and theoretical analysis involving both surface and in‐depth radiative heat flux absorption are utilized to investigate the influence of their combination on ignition of PMMA (Polymethyl Methacrylate). Ignition time, transient temperature in a solid and optimized combination of these two absorption modes of black and clear PMMA are examined to understand the ignition mechanism. Based on the comparison, it is found that the selection of constant or variable thermal parameters of PMMA barely affects the ignition time of simulation results. The linearity between tig-0.5 and heat flux does not exist anymore for high heat flux. Both analytical and numerical models underestimate the surface temperature and overestimate the temperature in a solid beneath the heat penetration layer for pure in‐depth absorption. Unlike surface absorption circumstances, the peak value of temperature is in the vicinity of the surface but not on the surface for in‐depth absorption. The numerical model predicts the ignition time better than the analytical model due to the more reasonable ignition criterion selected. The surface temperature increases with increasing incident heat flux. Furthermore, it also increases with the fraction of surface absorption and the radiative extinction coefficient for fixed heat flux. Finally, the combination is optimized by ignition time, temperature distribution in a solid and mass loss rate. View Full-Text
Keywords: surface absorption; in‐depth absorption; ignition; thermal degradation; PMMA surface absorption; in‐depth absorption; ignition; thermal degradation; PMMA
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Gong, J.; Chen, Y.; Li, J.; Jiang, J.; Wang, Z.; Wang, J. Effects of Combined Surface and In‐Depth Absorption on Ignition of PMMA. Materials 2016, 9, 820.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top