Dust explosions in spherical vessels: The role of flame thickness in the validity of the ‘cube-root law’

Dahoe, A.E.; Zevenbergen, J.F.; Lemkowitz, Saul; Scarlett, B. Florence

doi:10.1016/0950-4230(95)00054-2

Cited by 193 publications

(95 citation statements)

References 6 publications

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“…(2) is used to design the actual plant-sized equipment by applying standard test results from laboratory-sized vessels (Dahoe et al [3]). …”

Section: Description Of Consequence Modellingmentioning

confidence: 99%

“…(2) will be more accurate if the experiments were carried out as close as possible to the actual conditions under consideration (Crowl and Louvar [6]). For example the cubic root law is applicable for varying size of vessels with similar geometrical of vessels if the flame thickness is negligible compared to vessel radius, similar burning velocity in all volumes and point ignition at the centre of vessels (Dahoe et al [3]). The laminar burning is the linear rate of combustion reaction zone propagates relative to the unburned gas of flammable mixture.…”

Section: Description Of Consequence Modellingmentioning

confidence: 99%

“…It was adopted from premixed gas property theory and therefore the specifications of laminar dust explosion and laminar gas explosion in closed vessel should be similar Eckhoff [5]. Several models were developed based on theories of laminar flame propagation during the closed vessel explosion such as Dahoe et al [3], Nagy et al (Eckhoff [5]) and Nomura and Tanaka (Eckhoff [5]). These models are shown in table 2.…”

Section: Description Of Consequence Modellingmentioning

confidence: 99%

“…3 Case study Dahoe et al [3] performed their thin-flame model for three spherical vessels of 20L, 1m 3 and 10m 3 volumes to predict the pressure evolution and the rate of pressure rise. Nagy et al (Eckhoff [5]) performed their experiments in the closed Hartman bomb ranging from 1.2L to 14m 3 of vessel volumes.…”

Section: Description Of Consequence Modellingmentioning

confidence: 99%

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Consequence modelling of a dust explosion

Rahman¹,

Takriff²

2011

WIT Transactions on the Built Environment

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A dust explosion is a serious hazard in process industries where combustible dust is handled. Dust explosion commonly occurs in a confined space such as a silo, a vessel or a warehouse. Based on industrial accidents involving a dust explosion, it may cause death, injuries and property damage. Therefore, a practical approach for integrated risk management of dust explosion hazards is required. This research focuses on the development of a spreadsheet tool for predicting the severity of dust explosion. The consequence modelling is required to enable the assessment of risk associated with dust explosion. Various published models were studied for initial work of consequence modelling. Parameters considered were the dust deflagration index (K st ), the maximum explosion pressure (P max ), the maximum rate of pressure rise (dP/dt) max and the laminar burning velocity (S lbv ). Reliable value for these dust explosion parameters have been tabulated based on closed vessel laboratory tests. A case study of dust explosion involving maize starch in closed vessel was used to test and validate the developed consequence modelling tool. The modelling result was discussed by comparing the predicted value against experimental value. The spreadsheet tool that was developed in this work can be used for the purpose of risk management of a facility associated with dust explosion hazards. It can be used to assist the application to combustion suppressant agent and design of explosion venting to prevent and mitigate the consequence of dust explosion.

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“…(2) is used to design the actual plant-sized equipment by applying standard test results from laboratory-sized vessels (Dahoe et al [3]). …”

Section: Description Of Consequence Modellingmentioning

confidence: 99%

Section: Description Of Consequence Modellingmentioning

confidence: 99%

Section: Description Of Consequence Modellingmentioning

confidence: 99%

Section: Description Of Consequence Modellingmentioning

confidence: 99%

See 2 more Smart Citations

Consequence modelling of a dust explosion

Rahman¹,

Takriff²

2011

WIT Transactions on the Built Environment

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“…8,27,28 Notably, Dahoe et al propose a simple;but very interesting;formulation by considering the flame thickness in dust explosion. 27 This requires knowing the maximum explosion pressure and the flame speed. But this approach is mainly developed for dust explosion because the large flame thickness impacts drastically on the general cube-root law, which is commonly used to determine the K st .…”

Section: Introductionmentioning

confidence: 99%

Confined Kerosene Vapor Explosion: Severity Prediction Laws Based on Numerical Simulations.

Gascoin¹,

Gillard

2010

Energy Fuels

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The vulnerability of aircraft, if attacked by conventional weapons, depends notably on the possibility to initiate and to propagate a combustion reaction in the multicompartmented kerosene tanks. After a review of the related mechanisms and existing studies, the numerical simulation tool MIRAGE (french acronym for gas flow adaptable and transient reactive modeling) is used extensively to investigate the effects of four parameters: the ignition energy (from 5 to 1000 J), the equivalence ratio in air (from 0.3 to 2.19), the tank pressure (from 1 to 1.8 bar absolute), and its volume (from 0.4 to 2 m 3 ). A detailed kinetic mechanism is considered (207 species, 1592 reactions) to properly represent the chemistry. The maximum pressure after explosion is found to depend mainly on the initial pressure and on the equivalence ratio, but not on the tank volume or the applied energy. A critical value of the energy, corresponding to the limit between ignition and no ignition, is shown depending on the equivalence ratio but also on the initial pressure of the tank. Thanks to these results of "numerical experiments", empirical laws are proposed to estimate the overpressure and its dynamic depending on the preceding four parameters. These laws are also applied to some test cases of the literature, with good agreement.

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References

2004

Handbook of Explosion Prevention and Protection

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Dust explosions in spherical vessels: The role of flame thickness in the validity of the ‘cube-root law’

Cited by 193 publications

References 6 publications

Consequence modelling of a dust explosion

Consequence modelling of a dust explosion

Confined Kerosene Vapor Explosion: Severity Prediction Laws Based on Numerical Simulations.

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