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Monday, May 11, 2020 | History

3 edition of Ignition and flame spread of PMMA found in the catalog.

Ignition and flame spread of PMMA

Ignition and flame spread of PMMA

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  • 31 Currently reading

Published by National Aeronautics and Space Administration in Washington, DC .
Written in English

    Subjects:
  • Polymers.,
  • Flame spread.

  • Edition Notes

    StatementK. Akita and T. Hirano.
    SeriesNASA technical translation -- NASA TT-20290., NASA technical translation -- 20290.
    ContributionsHirano, Toshisuke., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15286000M

    experimental data for upward flame spread on a 5 m PMMA panel. A simplified flame spread model is also applied to assess the FDS simulation results. Capabilities and limitations of FDS V.4 for upward flame spread predictions are addressed, and recommendations for improvements of FDS and practical use of FDS for fire spread are by: Flame spread over inclined fuels is a common fire-hazard scenario, however it has received much less at-tention in the literature than vertical [1,2] or horizontal [3] flame spread. This work will focus on upward flame spread, the rates of which are much higher than .

    For more information concerning flame spread or other building code regulations, please visit the ICC website at *Flammability of Paint Study, National Paint & Coatings Association, Inc., , Project , Southwest Research Institute. Flammability of Polymers Introduction Most plastics are carbon-based materials and will burn and give off gases and smoke when subjected to a flame. Plastics are excellent fuels but are generally classed as ordinary combustibles and fall into the same category as .

    The flash point or the critical heat flux for ignition (ignition temperature) could be used as an ignition criterion as well as an indicator of flame spread [1]. Also, the lateral ignition and flame spread test provides other thermal properties that can be linked to the material and could be used to model ignition and opposed flame spread [1]. Combustion of Polymer Materials. Roza determined diffusion combustion diffusion flame effect fibres fillers flame diffusion flame reactions flame retardants flame spread flame zone flammability flammability of polymer foam fuel gas phase gaseous phase gases groups halogen heat flow heat transfer heterogeneous hydrocarbons ignition.


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Ignition and flame spread of PMMA Download PDF EPUB FB2

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

The autoignition temperature is the spontaneous (self-ignition) temperature at which a substance will produce a hot flame without an external ignition source. Autoignition occurs when a hot flame inside a test flask suddenly appears accompanied by a sharp rise in temperature.

With cold flame ignition the temperature rise is gradual. Get this from a library. Piloted Ignition and Flame Spread Over Clear and Black PMMA Cylinders in Opposed Flows. [Shmuel Link] -- The ignition of and flame spread over solid fuels is of fundamental importance to the field of fire safety.

Knowing how, why, and when a material will ignite informs how dangerous a materials use may. flame spread [1]. Also, the lateral ignition and flame spread test provides other thermal properties that can be linked to the material and could be used to model ignition and opposed flame spread [1].

These properties are mainly the thermal inertia (kρC) and the flame spread parameter (φ). The energy release rate corresponds to the total energy. Flame propagation is expressed by length (cm), 8 rate (mm/s), 8, 9, 11, Ignition and flame spread of PMMA book and flame persistence (s).

9, 11, 13 Figure shows data on the rate of flame spread for a propylene-ethylene copolymer filled with Portacarb (a mixture of hydromagnesite and huntite). 9, 11, 13 The addition of filler has reduced the rate of flame spread in an.

Solid PMMA sheet m× m ( m. 2) 4 mm 4 mm - kgm Colourless & transparent Nailed to concrete wall. SCENARIO I.

A small fire source comparable to a severe basket fire was used to assess the flame spread behaviours of the plastics under an accidental fire. A square container of m wide and m high with litre 90 #.

The phenomena of ignition delay and subsequent downward flame spread over a finite length PMMA slab under an opposed flow with radiation effect are investigated by using an unsteady combustion model.

The corresponding experimental test channel is mm long with ×mm2 rectangular cross section. TheFile Size: KB. v %&('*)+, +.-/ I, Yun Jiang, declare that the PhD thesis entitled Decomposition, Ignition and Flame Spread on Furnishing Materials is no more thanwords in length, exclusive of tables, figures, appendices, references and footnotes.

The comparison of surface temperature of PMMA between the developed analytical model and simulation results is illustrated in Fig. a cri is crucial for ignition and the ranges of Author: Chunjie Zhai, Siyu Zhang, Shuren Yao, Qingbin Zhan, Shuifeng Zhang, Yue Wang.

The Effect of Gravity on Flame Spread over PMMA Cylinders. The review emphasizes the complex role of the metallic core in the ignition, flame spread, burning, and extinction of wire fire.

Prediction of Upward Flame Spread over Polymers. from ignition until total sample involvement, across the height of 5 cm wide, 15 cm tall samples of acrylonitrile butadiene styrene (ABS) as a Author: Isaac Leventon.

This test method addresses the fundamental aspects of piloted ignition and flame spread. The procedure is suitable for the derivation of relevant material flammability parameters that include minimum exposure levels for ignition, thermal-inertia values, and flame-spread properties.

conditions) to enable flame spread, this will be a necessary part of a test to derive flame spread data. Without a loss in generality of the end results, a thermal theory of flame spread (and ignition) will be considered.

The diagram in figure I shows a flame spreading over the surface in the Size: KB. The test results suggest significance of the increase of total flame height through merging of flames and cooperative effect of the burning of PMMA fences and combustibles on the balconies for the generation of a tall flame enough to cause ignition on the upper floor.

KW - Balconies. KW - PMMA. KW - Cited by: 6. Similar trends in flame-spread rate with sample diameter, oxygen concentration, and flow velocity (beyond the natural convection break-point in 1g) were observed, but for the tested conditions, flame-spread in micro-gravity is categorically faster than innumerical modeling of flame-spread over cast PMMA rods as a function of ambient Cited by: 1.

Spacecraft fire safety is an important consideration when designing future exploration missions. Concurrent flow flame spread experiments were carried out aboard the Cygnus spacecraft while in orbit to address current knowledge gaps related to solid fuel combustion in microgravity.

The experiments used PMMA (polymethylmethacrylate) samples that were 50 mm wide and mm long Cited by: 1. ThermaKin2D simulation of upward flame spread.

Predicted in-depth temperature (left) and flame heat flux (center) profiles are plotted alongside experimental and. @article{osti_, title = {Ignition transient of a polymethylmethacrylate slab in a sudden-expansion combustor}, author = {Yang, J T and Wu, C Y.Y. and Din, S J}, abstractNote = {Ignition and the subsequent flame development of a polymethylmethacrylate (PMMA) slab in a sudden-expansion combustor was observed experimentally.

The solid fuel was ignited by a hot oxidizing flow stream that. Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF.

Visit to get more information about this book, to buy it in print, or to download it as a free PDF. The objective of this work is to study the effect of pressure, and consequently buoyancy and indirectly gravity, on downward flame spread rate over cylindrical samples of polymethyl-methacrylate (PMMA), and by comparison with reduced gravity data, observe up to what point low-pressure can be used to replicate flame spread in space by: 2.

Lateral Ignition and Flame Spread (LIFT) Summary: The lateral ignition and flame spread test (LIFT) can be used to as a measure of the ability of a product to inhibit the ignition of the substrate to which it is applied. The substrate, in a vertical orientation, is exposed to a known radiant heat source and the time to ignition measured.

Two Sides Ignition Over a Thin PMMA Sheet in Microgravity. Author(s) after the termination of the laser irradiation subsequent shrinkage of the flame that was initiated by the frontside ignition; as the flame shrank close to the frontside surface it traveled through a small, open hole generated by the consumption of PMMA from the frontside.Lateral Ignition and Flame Spread Apparatus The apparatus uses a specimen measuring mm x mm.

Analysis of the data yields effective values for the thermal inertia of the material, its ignition temperature, time to ignition, the velocity of lateral flame spread.