Dust flame acceleration effects

Ogle, Russell A.

doi:10.1016/b978-0-12-803771-3.00009-0

Cited by 3 publications

(3 citation statements)

References 47 publications

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“…In short, it can be considered as a loop; the bend can increase the flow distortion, which generates additional turbulence in turn improving the combustion of unburned particles due to the better dust/air dispersion and the more available air [23]. The rise in the mass burning rate caused an increase in the heat released which caused an expansion of combustion gases [24]. Thus, the expansion of combustion products may be related to higher flame speeds due to a release of energy and the formation of strong compression waves [25].…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the expansion of combustion products may be related to higher flame speeds due to a release of energy and the formation of strong compression waves [25]. In addition, the dust combustion process can also be enhanced by the accumulation of unburned dust in the bend, approaching the stoichiometric concentration which would lead to a more optimal combustion process [24].…”

Section: Resultsmentioning

confidence: 99%

“…When a shock pressure wave hits a solid surface, a new shock wave appears, called a reflected wave, and moves in the opposite direction. According to Russell A. Ogle, reflected waves are important because they usually cause a greater overpressure than the original one [24,27]. Regarding the results of WF dust, it can be seen that the pressure fell when using bends.…”

Section: Influence Of Bends (R/d Ratio Of 06) On Pressurementioning

confidence: 99%

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Influence of Bends in the Functionality of Passive Explosion Isolation Valves

Garrido-Ceca

Puig-Gamero²,

Ramírez-Gómez

2022

Applied Sciences

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Explosion isolation flap valves are one of the most used explosion protection systems in process industries; research is essential to improve them and to minimise both human and material losses when dust explosions take place. In this regard, there is little knowledge on the effect of bends in the functionality of these protective systems; hence, the main aim of this work is to bridge this gap. Large-scale dust explosions were performed, using three different types of dust: metal dust and two types of organic dust. In order to analyse the effect of bends in the functionality of these protective systems, results using a straight duct and one with bends were compared for each dust tested. In addition, the influence of the bend radius on aluminium dust explosions was also evaluated. The results indicated that the effect of bends depended on the explosive characteristics of the dust. However, for aluminium and maize starch dusts, bends led to higher pressures and flame velocities. Relevant information is provided to help decision-making when designing these valves. Moreover, such data can be used for consideration in the discussions held by the task force entrusted with developing the standard used to assess their functionality.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Influence Of Bends (R/d Ratio Of 06) On Pressurementioning

confidence: 99%

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