Advection and the self-heating of organic porous media

Aganetti, Rachel; Lamorlette, Aymeric; Guilbert, E; Morvan, Dominique; Thorpe, Graham

doi:10.1016/j.ijheatmasstransfer.2015.11.023

Cited by 13 publications

(12 citation statements)

References 27 publications

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“…Daily or yearly ambient temperature variations are highly relevant for the problems involving accidental ignition and subsequent fires of solid materials stored or transported in significant quantities. Such are the fires occurring in large piles of refuse-derived or biosolid fuels, food grains, coal, bagasse, compost, energetic materials involved in military applications, and similar fuels 1 2 3 4 5 6 7 8 25 .…”

Section: Resultsmentioning

confidence: 99%

“…This formulation is not physically realistic. In relevant practical applications temperature variations across the medium during self-ignition are significant 25 and therefore the model of the papers 23 24 is not physically relevant. It does not allow the influence of parameters controlling heat exchange with surroundings, such as Biot number Bi , on critical conditions to be investigated.…”

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confidence: 99%

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Thermal explosion in oscillating ambient conditions

Novozhilov

2016

Sci Rep

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Thermal explosion problem for a medium with oscillating ambient temperature at its boundaries is considered. This is a new problem in thermal explosion theory, not previously considered in a distributed system formulation, but important for combustion and fire science. It describes autoignition of wide range of fires (such as but not limited to piles of biosolids and other organic matter; storages of munitions, explosives, propellants) subjected to temperature variations, such as seasonal or day/night variation. The problem is considered in formulation adopted in classical studies of thermal explosion. Critical conditions are determined by frequency and amplitude of ambient temperature oscillations, as well as by a number of other parameters. Effects of all the parameters on critical conditions are quantified. Results are presented for the case of planar symmetry. Development of thermal explosion in time is also considered, and a new type of unsteady thermal explosion development is discovered where thermal runaway occurs after several periods of temperature oscillations within the medium.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Thermal explosion in oscillating ambient conditions

Novozhilov

2016

Sci Rep

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“…The equations are presented in one-dimensional form for simplification and can be generalized for two- or three-dimensional models. Additionally, the equation for momentum transport may be included in the model to consider strong convection inside and outside the pile. , …”

Section: Modeling the Self-heating Processmentioning

confidence: 99%

“…The state-of-the-art numerical models ,, theoretically describe the transport processes involved in the self-heating process and are therefore able to fully cover the process factors including pile size and configuration, ambient conditions, , and air flow inside and outside the pile . However, to cover the reaction and material related factors requires characterizing the properties and especially the kinetics of different biomass materials. , In particular, the submodels for the heat sources, that is, microbial activity and chemical oxidation, are still not so mechanistically based.…”

Section: Modeling the Self-heating Processmentioning

confidence: 99%

Review on Self-Heating of Biomass Materials: Understanding and Description

Sheng

Yao

2022

Energy Fuels

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Storage of bulk biomass materials is essential along the feedstock supply chain of bioenergy production. The self-heating accompanying biomass storage has hazardous consequences. With the increasing biomass utilization for bioenergy production, the risk and economic and environmental concerns about biomass storage have been attracting extensive research attention aimed at understanding the processes of heat generation, evaluating the propensity of a material to self-heating and spontaneous ignition, describing and predicting the self-heating process and consequences in biomass storage, and developing strategies and technologies for storage management. The advances in the understanding and description of heat generation processes including water-associated physical processes, microbiological degradation processes, and chemical oxidative processes during the self-heating in biomass storage are reviewed, with the focus on understanding the processes and their underlying mechanisms, reaction kinetics, and heats of reaction through experimental studies and description of heat generation and self-heating processes through kinetic analyses and modeling. This review highlights the need to improve the mechanistic model description of the self-heating processes and associated material changes and product formation, which demand a better understanding and description of microbial degradation and chemical oxidation through experimental study.

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“…Their results showed that the temperatures increase more quickly by increasing heat flux and decreasing moisture content. Advection and the self-heating of organic porous media were investigated by Aganetti et al [30]. The authors developed a convection-diffusion model using the CFD tool OpenFOAM to examine the impact of advection in the selfheating process of bio-solids.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Effect of Fire Intensity on Wind Driven Surface Fire and Its Impact on an Idealized Building

Edalati-nejad

Ghodrat

Fanaee

et al. 2022

Fire

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This paper presents an investigation on the effect of fire intensity of a wind driven surface fire, similar to a large wildfire, on an idealized structure located downstream from the fire source. A numerical simulation was conducted using an open source CFD code called FireFOAM, which is a transient solver for fire simulation and turbulent diffusion flames, supported by a large eddy simulation (LES) solver for incompressible flow. The numerical data were verified using the aerodynamic experimental data of a full-scale building model with no fire effects. An idealized cubic obstacle representing a simplified building with the dimension of 6 × 6 × 6 m; is considered downstream from the fire source. Different fire intensity values of the fire line representing different grassland fuels were simulated to analyse the impact of wind-fire interaction on a built area. To solve the problem, a coupled velocity and pressure method was applied through a PIMPLE scheme in FireFoam solver of OpenFoam platform. There is a good agreement between simulated results and experimental measurements with a maximum error of 18%, which confirms the validity and accuracy of the model. The results showed that by increasing the fire intensity; the velocity of the crosswind stream increases, which causes low-density air and generates an extra stream behind the fire plume. It was also found that increasing fire intensity from 10 MW/m to 18 MW/m raises the integrated temperature on the ground near the building and on the surface of the building by 26%, and 69%, respectively.

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Advection and the self-heating of organic porous media

Cited by 13 publications

References 27 publications

Thermal explosion in oscillating ambient conditions

Thermal explosion in oscillating ambient conditions

Review on Self-Heating of Biomass Materials: Understanding and Description

Numerical Simulation of the Effect of Fire Intensity on Wind Driven Surface Fire and Its Impact on an Idealized Building

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