Modeling heat transfers across a silicone-based intumescent coating

Nyazika, Tatenda; Jimenez, Maude; Samyn, Fabienne; Bourbigot, Serge

doi:10.1088/1742-6596/1107/3/032012

Cited by 6 publications

(12 citation statements)

References 12 publications

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“…Further examples on the use of morphology for fire protection can be found in the works of Cirpici et al [7] and references therein. On the other hand, very recently, Okyay et al [8] demonstrated the existence of power laws in expansion and charring of intumescent coatings: the evolution of micro and macrostructure could be defined by fractal rules and generalized for different intumescent actions (i.e., physical or chemical [9]), as complementary to phenomenological approaches [10]. For such studies, measurable accurate cross-sectional images were compulsory using a combination of CT and correlative imaging, in order to describe the coating expansion patterns.…”

Section: Introductionmentioning

confidence: 99%

A Facile Technique to Extract the Cross-Sectional Structure of Brittle Porous Chars from Intumescent Coatings

et al. 2019

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Intumescent coatings are part of passive fire protection systems. In case of fire, they expand under thermal stimuli and reduce heat transfer rates. Their expansion mechanisms are more or less recognized, but the fire testing data shall be interpreted as function of coating morphology. Expansion ratios are examined together with the inner structures of specimens submitted to fire. Bare cutting techniques damage the highly porous and fibrous specimens because they become very crumbly due to charring. So far, absorption contrasted X-ray computed microtomography (CT) was used as a non-destructive technique. Nevertheless, access to X-ray platforms can be relatively expensive and scarce for regular use. Also, it has some drawbacks for carbon rich specimens strongly adhering on steel substrates because it leads sometimes to noisy images and lost data due to resolution limits on specimens reaching ten of centimeters. Therefore, we propose an inexpensive and more accessible experimental approach to observe those specimens with minimized structural damage under visible lighting. To that end, charred specimens were casted into pigmented epoxy resin. After surface treatments, color contrasted cross-sections could be observed under optical digital microscopy thanks to high level of interconnectivity of pores. Subsequent image treatments confirmed that the structural integrity was kept when compared to previous CT data. The proposed method is practical, cheaper and more accessible for the quantitative assessment of inner structure of charred brittle specimens.

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Section: Introductionmentioning

confidence: 99%

A Facile Technique to Extract the Cross-Sectional Structure of Brittle Porous Chars from Intumescent Coatings

et al. 2019

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“…COMSOL Multiphysics has also successfully been used to model pyrolysis. 38,76–78 For example, Girardin et al 38 predicted the gasification experiments of ethylene-vinyl acetate containing aluminum tri-hydroxide using COMSOL Multiphysics. Agreement between experimental and numerical results of temperature and mass loss was good.…”

Section: Pyrolysis Modelsmentioning

confidence: 99%

“…This is a critical feature of Li et al’s 29,154 approach that differentiates it from the majority of other pyrolysis parameterization studies. 15,78,79,93,155 In most similar studies, MLR was used as an optimization target and thus the model’s ability to capture MLR was not viewed as an independent indicator of the model’s validity. The same technique was used by McKinnon et al, 156 which was applied to corrugated cardboard.…”

Section: Parameter Estimationmentioning

confidence: 99%

“…209 The model was validated against experimental results under different fire conditions. Nyazika et al 78 experimentally determined the swelling of a silicone-based intumescent coating using an infrared camera then implemented the swelling profile in the numerical model using the arbitrary Lagrangian–Eulerian (ALE) method. Furthermore, Okyay et al 210 recently proposed a new approach by applying the theory of fractals and random nature events to conceptualize the expansion of different intumescent coatings.…”

Section: Applicationsmentioning

confidence: 99%

“…Given the complicated fire behavior of the studied materials, Gypro performed reasonably well. COMSOL Multiphysics has also successfully been used to model pyrolysis [38,[75][76][77]. For example, Girardin et al [38] predicted the gasification experiments of ethylene-vinyl acetate containing aluminum tri-hydroxide using COMSOL Multiphysics.…”

Section: B Comprehensive Modelsmentioning

confidence: 99%

See 2 more Smart Citations

Pyrolysis modeling, sensitivity analysis, and optimization techniques for combustible materials: A review

Nyazika

Jimenez

Samyn

et al. 2019

Journal of Fire Sciences

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Over the past years, pyrolysis models have moved from thermal models to comprehensive models with great flexibility including multi-step decomposition reactions. However, the downside is the need for a complete set of input data such as the material properties and the parameters related to the decomposition kinetics. Some of the parameters are not directly measurable or are difficult to determine and they carry a certain degree of uncertainty at high temperatures especially for materials that can melt, shrink, or swell. One can obtain input parameters by searching through the literature; however, certain materials may have the same nomenclature but the material properties may vary depending on the manufacturer, thereby inducing uncertainties in the model. Modelers have resorted to the use of optimization techniques such as gradient-based and direct search methods to estimate input parameters from experimental bench-scale data. As an integral part of the model, a sensitivity study allows to identify the role of each input parameter on the outputs. This work presents an overview of pyrolysis modeling, sensitivity analysis, and optimization techniques used to predict the fire behavior of combustible solids when exposed to an external heat flux.

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Latest trends for structural steel protection by using intumescent fire protective coatings: a review

Yasir

Ahmad

Yusoff

et al. 2019

Surface Engineering

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Intumescent coating (IC) is one of the famous protection systems for steel structures in the event of fire. Over the last few decades, ICs have been gaining much attention because they are applied on steel structure as fire protection. Upon exposure to flame, the coatings burn and swell, forming a heat shield called char. The formed char plays a critical role in protecting the steel substrate from the sudden rise in temperature which in return maintains the structural integrity of steel. In view of the importance of ICs, especially to the oil and gas sector, this paper reviews recent work on materials used for coatings and processing techniques for IC formation. The paper also gathers the latest information that focuses on ICs' main binders, flame retardant additives, and fillers. Finally, important issues in regard to durability and reliability of coatings in different environments are also highlighted.

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Modeling heat transfers across a silicone-based intumescent coating

Cited by 6 publications

References 12 publications

A Facile Technique to Extract the Cross-Sectional Structure of Brittle Porous Chars from Intumescent Coatings

A Facile Technique to Extract the Cross-Sectional Structure of Brittle Porous Chars from Intumescent Coatings

Pyrolysis modeling, sensitivity analysis, and optimization techniques for combustible materials: A review

Latest trends for structural steel protection by using intumescent fire protective coatings: a review

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