Thermal Stability Investigation in a Reactive Sphere of Combustible Material

Lebelo, Ramoshweu Solomon

doi:10.1155/2016/9384541

Cited by 15 publications

(15 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some mathematical models that are less expensive and faster than experimental approaches have been implemented in the literature to explain the auto-ignition of combustible materials in a stockpile. For instance, a one-step combustion process of heat transfer in a spherical channel was investigated in [12,13]. According to their reports, the system maintains stability as heat escapes into the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Investigation of a Combustible Polymer in a Rectangular Stockpile: A Spectral Approach

2023

Self Cite

View full text Add to dashboard Cite

Despite the wide application of combustion in reactive materials, one of the challenges faced globally is the auto-ignition of such materials, resulting in fire and explosion hazards. To avoid this unfortunate occurrence, a mathematical model describing the thermal decomposition of combustible polymer material in a rectangular stockpile is formulated. A nonlinear momentum equation is provided with the assumption that the combustible polymer follows a Carreau constitutive relation. The chemical reaction of the polymer material is assumed to be exothermic; therefore, Arrhenius’s kinetic theory is considered in the energy balance equation. The bivariate spectral local linearization scheme (BSLLS) is utilized to provide a numerical solution for the dimensionless equations governing the problem. The obtained results are validated by the collocation weighted residual method (CWRM), and a good agreement is achieved. Dimensionless velocity, temperature, and thermal stability results are presented and explained comprehensively with suitable applications. Some of the obtained results show that thermal criticality increases with increasing power law index (n) and radiation (Ra) values and decreases with increasing variable viscosity (β1) and material parameter (We) values.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Motivated by the reviewed literature in [12][13][14]22,28], this study focuses on an investigation of the thermal decomposition of Carreau fluid in a rectangular stockpile with variable thermophysical properties. It is believed that this present study has not been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of a Combustible Polymer in a Rectangular Stockpile: A Spectral Approach

2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…The continued accumulation of heat in the system, makes the temperature to raise exponentially following the Arrhenius rate law (Taghikhani, 2011;Logan, 1982). Physical parameters or factors that affect self-ignition in stockpiles of combustible materials are, among others, the material particle size, the temperature of the environment, the humidity of the material, the porosity and airflow rate of the stockpile (Lebelo, 2016;Schmidt et al, 2003). The parameters listed above need experimentation to study their influence on the temperature gradients during combustion.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability Analysis in a Two-Step Reactive Cylindrical Stockpile

Lebelo

Mahlobo

Moloi

2018

American Journal of Applied Sciences

View full text Add to dashboard Cite

“…Examples of stockpiles that spontaneously combust include those of coal, hay and wood. One of the previous studies indicated that some of the veld fires are caused by spontaneous combustion of stockpiles of reactive materials, such as the dumped rubbish in the open veld [1]. A reactive material is one that contains carbon or hydrocarbon component that readily reacts with the oxygen trapped within the stockpile, due to low-temperature oxidation reaction, also called the exothermic chemical reaction [2,3].…”

Section: Introductionmentioning

confidence: 99%

Heat loss analysis in a radiating slab of variable thermal conductivity

Lebelo¹,

Moloi²

2018

IJET

View full text Add to dashboard Cite

This article investigates the transfer of heat in a stockpile of reactive materials, that is assumed to lose heat to the environment by radiation. The study is modeled in a rectangular slab whose materials are of variable thermal conductivity. The stockpile's reactive material in this context is one that readily reacts with the oxygen trapped within the stockpile due to exothermic chemical reaction. The study of the combustion process in this case is conducted theoretically by using the Mathematical approach. The differential equation governing the problem is tackled numerically by applying the Runge-Kutta Fehlberg (RKF45) method coupled with the Shooting technique. To investigate the heat transfer phenomena, some kinetic parameters embedded in the governing differential equation, are varied to observe the behavior of the temperature profiles during the combustion process. The results obtained from the temperature profiles, are depicted graphically and discussed accordingly. It was discovered that kinetic phenomena such as the reaction rate parameter, accelerates the exothermic chemical reaction. However, the radiation parameter decelerates the exothermic chemical reaction by lowering the temperature profiles.

show abstract

Thermal Stability Investigation in a Reactive Sphere of Combustible Material

Cited by 15 publications

References 12 publications

Numerical Investigation of a Combustible Polymer in a Rectangular Stockpile: A Spectral Approach

Numerical Investigation of a Combustible Polymer in a Rectangular Stockpile: A Spectral Approach

Thermal Stability Analysis in a Two-Step Reactive Cylindrical Stockpile

Heat loss analysis in a radiating slab of variable thermal conductivity

Contact Info

Product

Resources

About