The effect of porous coating on the flame acceleration in hydrogen–air mixture

Bivol, G. Yu.; Головастов, С. В.

doi:10.1016/j.psep.2020.02.016

Cited by 32 publications

(2 citation statements)

References 24 publications

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“…As shown in Figure a,b, following ionic crosslinking by Ca 2+ , the aerogel structure formed after the ice-templating and sublimation was still preserved, yet it was composed of compact pores with a narrower pore diameter ranging from 40 to 280 μm compared to 60–400 μm for the ACNF aerogel (Figure a,b). A higher flame velocity has been reported for porous materials with larger pores, which is in agreement with the suppressed flame propagation upon crosslinking. The structure resembled that of wood-based CNF aerogels assembled using the same approach at 1 wt % solid content, indicating that the presence of alginate does not hinder ice-crystal growth.…”

Section: Resultssupporting

confidence: 83%

Seaweed-Derived Alginate–Cellulose Nanofiber Aerogel for Insulation Applications

Berglund

Nissilä

Sivaraman

et al. 2021

ACS Appl. Mater. Interfaces

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The next generation of green insulation materials is being developed to provide safer and more sustainable alternatives to conventional materials. Bio-based cellulose nanofiber (CNF) aerogels offer excellent thermal insulation properties; however, their high flammability restricts their application. In this study, the design concept for the development of a multifunctional and non-toxic insulation material is inspired by the natural composition of seaweed, comprising both alginate and cellulose. The approach includes three steps: first, CNFs were separated from alginate-rich seaweed to obtain a resource-efficient, fully bio-based, and inherently flame-retardant material; second, ice-templating, followed by freeze-drying, was employed to form an anisotropic aerogel for effective insulation; and finally, a simple crosslinking approach was applied to improve the flame-retardant behavior and stability. At a density of 0.015 g cm –3 , the lightweight anisotropic aerogels displayed favorable mechanical properties, including a compressive modulus of 370 kPa, high thermal stability, low thermal conductivity (31.5 mW m –1 K –1 ), considerable flame retardancy (0.053 mm s –1 ), and self-extinguishing behavior, where the inherent characteristics were considerably improved by crosslinking. Different concentrations of the crosslinker altered the mechanical properties, while the anisotropic structure influenced the mechanical properties, combustion velocity, and to some extent thermal conductivity. Seaweed-derived aerogels possess intrinsic characteristics that could serve as a template for the future development of sustainable high-performance insulation materials.

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Section: Resultssupporting

confidence: 83%

Seaweed-Derived Alginate–Cellulose Nanofiber Aerogel for Insulation Applications

Berglund

Nissilä

Sivaraman

et al. 2021

ACS Appl. Mater. Interfaces

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“…As the main function of parallel narrow channels, flame quenching has been investigated by scholars at home and abroad in recent years. Some scholars 1–4 found that the effect of parallel narrow channels on the propagation of flame and shock waves was significant. Jin et al 5 investigated the quenching behavior of hydrogen‐air flame under the action of wire mesh in a closed pipe.…”

Section: Introductionmentioning

confidence: 99%

Investigation on quenching characteristics of parallel narrow channels for deflagration flames

Guo

Wang

et al. 2023

Fire and Materials

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A set of experimental equipment for quenching the deflagration flame in linked vessels with parallel narrow channels was proposed. The quenching effects of the deflagration flame in the linked vessels were investigated, the influence law and mechanism of parallel narrow channels on the deflagration flame was analyzed. The results showed that the Pmax and the (dP/dt)max at each position were both lower than without parallel narrow channels, which indicated that the propagation of flame was inhibited by parallel narrow channels effectively, and the explosion intensity was also reduced. The pressure oscillation phenomenon inside the linked vessels disappeared due to the inclusion of parallel narrow channels. The deflagration flame was successfully quenched when the channel gaps were 0.5, 1.5, and 3 mm, but failed to be quenched when the channel gap was 6 mm. The quenching distance and the average propagation velocity of the deflagration flame in parallel narrow channels increased with the increase of the channel gap. When the channel gap was 6 mm, the deflagration flame completely passed through parallel narrow channels, and the average propagation velocity of deflagration flame was significantly greater than that when the deflagration flame was successfully quenched.

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Flame Front Dynamics in Flow of Hydrogen-Air Mixture in a Channel with Sudden Expansion and Polyurethane Foam

Golovastov,

Bivol,

Kuleshov

et al. 2023

Flow Turbulence Combust

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The effect of porous coating on the flame acceleration in hydrogen–air mixture

Cited by 32 publications

References 24 publications

Seaweed-Derived Alginate–Cellulose Nanofiber Aerogel for Insulation Applications

Seaweed-Derived Alginate–Cellulose Nanofiber Aerogel for Insulation Applications

Investigation on quenching characteristics of parallel narrow channels for deflagration flames

Flame Front Dynamics in Flow of Hydrogen-Air Mixture in a Channel with Sudden Expansion and Polyurethane Foam

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