scholarly journals Combustion Performance and Thermal Stability of Basalt Fiber-Reinforced Polypropylene Composites

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1826 ◽  
Author(s):  
Tang ◽  
Xu ◽  
Li
Keyword(s):  
Thermal Stability ◽  
Heat Flux ◽  
Thermal Decomposition ◽  
Heat Release ◽  
Decomposition Rate ◽  
Basalt Fiber ◽  
External Heat ◽  
Fiber Reinforced ◽  
Combustion Performance ◽  
External Heat Flux

In this study, the thermal stability and combustion performance of basalt fiber reinforced polypropylene (BFRPP) composite and pure polypropylene (PP) were compared. The results show that the basalt fiber has no positive effect on increasing the initial decomposition temperature of PP, but it could reduce the maximum thermal decomposition rate and increase the temperature of the maximum thermal decomposition rate. Adding basalt fiber to PP could slightly reduce the limiting oxygen index. At the same oxygen concentration, the BFRPP burned significantly more slowly than the PP. In addition, during the combustion, it was observed that the BFRPP showed a better anti-melt dripping effect than the PP. The results from the cone calorimeter test show that, under the same external heat flux, the time-to-ignition (TTI) of BFRPP was less than that of PP. This indicated that BFRPP was easier to ignite than PP. It was also found that the reciprocal of the square root of the TTI of both has a linear relationship with external heat flux. BFRPP has a lower peak heat release rate and total heat release than PP. Moreover, BFRPP produced less smoke than PP when burned.

scholarly journals Burning process characterization of biodiesel pool fires

2018 ◽  
Vol 37 (1) ◽  
pp. 3-17 ◽  
Author(s):  
Peter Rantuch ◽  
Lenka Blinová ◽  
Alica Bartošová ◽  
Jozef Martinka ◽  
Igor Wachter
Keyword(s):  
Heat Flux ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Combustion Process ◽  
Combustion Efficiency ◽  
External Heat ◽  
Specimen Holder ◽  
Process Characterization ◽  
External Heat Flux

This article deals with the combustion process of biodiesel produced from waste vegetable oil. The main fire-technical properties related to its thermal degradation during pool fire were observed. As a test device, a cone calorimeter with modified specimen holder was used. The measurements were obtained by applying an external heat flux of 20 and 25 kW m−2 and using a spark initiator. On the basis of the measured results, the biodiesel combustion was divided into six consecutive phases described by the heat release rate, CO production, CO2 production and smoke production rate. Mean heat release rate and maximum average heat release energy peaked at 315 kW m−2, respectively at 391 kW m−2 (external heat flux of 20 kW m−2) and at 420 kW m−2, respectively at 504 kW m−2 (external heat flux of 25 kW m−2). The flash point of biodiesel reached a lower value compared to oils. The CO/CO2 ratio in the flue gas showed virtually the same combustion efficiency throughout the whole experiment.

Effect of Heat Flux on Combustion Performance of Glass Fiber Reinforced Epoxy Composite

2011 ◽  
Vol 239-242 ◽  
pp. 595-599
Author(s):  
Mei Wang ◽  
Yun Chu Hu ◽  
Zi Zhi Huang
Keyword(s):  
Heat Flux ◽  
Heat Release ◽  
Glass Fiber ◽  
Heat Release Rate ◽  
Release Rate ◽  
Epoxy Composite ◽  
Security Level ◽  
Fiber Reinforced ◽  
Combustion Performance ◽  
Glass Fiber Reinforced

Variation law of combustion performance of glass fiber reinforced epoxy composites under different heat fluxes was studied. Final result shows that the time of epoxy resin composite shortened when increased the heat flux, and the theoretical minimum ignition heat flux obtained by curve fitting of experiment data is 2.1638kW/m2; multiply heat flux increased the heat release rate and complicate the stratified combustion of materials, which making the heat release rate curves more complicated. What is more，multiply the heat flux caused incomplete combustion of materials and leaded greater smoke production rate. The residual quality decreased as increased heat flux, however when the heat flux beyond 50kW/m2, the residual quality no longer decreased, which suggested that the heat flux used to study these materials should not be more than 50kW/m2. To sum up the above combustion parameters ,we could know that the safety performance of this epoxy composite was medium level, in order to improve its security level further, smoke suppression should be handled.

The Application of IRAs Optimizing Design in Vacuum Thermal Test

2013 ◽  
Vol 390 ◽  
pp. 708-713
Author(s):  
Yu Wei Sun ◽  
Xiao Ning Yang
Keyword(s):  
Heat Flux ◽  
Heated Surface ◽  
Design Guidelines ◽  
External Heat ◽  
Simulation Test ◽  
Thermal Tests ◽  
Typical Structure ◽  
Infra Red ◽  
Optimizing Design ◽  
External Heat Flux

The thermal vacuum environment simulation test is indispensible for the development of spacecrafts. And the simulation of the external heat flux exerted onto the spacecraft is one of the determining elements of the simulation test. In China, the infra-red simulation is a common method that used as simulation equipment of the external heat flux. The planar infra-red arrays is the most typical structure elements for planar spacecraft surface, but the margin effect of infra-red arrays influences the flux uniformity on heated surface severely. Based on Monte Carlo theory, some optimizing design guidelines had been drawn about planar infra-red arrays in past investigation. This paper introduces some testing and experiment that could confirm these guidelines, and these guidelines had been applied in some vacuum thermal tests of spacecrafts successfully.

Experimental study of commercial flame-retardant polycarbonate under external heat flux

2017 ◽  
Vol 131 (2) ◽  
pp. 1463-1470 ◽  
Author(s):  
Xuelin Zhang ◽  
Teng Zhang ◽  
Changhai Li ◽  
Hongshuang Wang ◽  
Xiao Chen ◽  
...  
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
Flame Retardant ◽  
External Heat ◽  
External Heat Flux

Effectiveness-NTU Relationship for a Counterflow Heat Exchanger Subjected to an External Heat Transfer

2004 ◽  
Vol 127 (9) ◽  
pp. 1071-1073 ◽  
Author(s):  
Gregory F. Nellis ◽  
John M. Pfotenhauer
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Exchanger ◽  
Numerical Model ◽  
Analytical Solution ◽  
Convenient Method ◽  
Process Engineering ◽  
External Heat ◽  
External Heat Transfer ◽  
External Heat Flux

This paper presents the analytical solution for the effectiveness of a counterflow heat exchanger subjected to a uniformly distributed, external heat flux. The solution is verified against conventional ε-NTU relations in the limit of zero external heat flux. This situation is of interest in applications such as cryogenic and process engineering, and the analytical solution provides a convenient method for treating differential elements of a heat exchanger in a numerical model.

Sign in / Sign up

Export Citation Format

Share Document