Deflagrations of H2?air and CH4?air lean mixtures in a vented multi-compartment environment

Silicon dispersions in water are used to produce pyrotechnic time delay compositions. The propensity of the silicon to react with water and to produce hazardous hydrogen gas must be suppressed. To this end the effect of surface modifications and medium pH on the rate of corrosion of silicon were studied at ambient temperature. It was found that the rate of hydrogen evolution increased with increasing pH. Silanes proved to be more effective silicon corrosion inhibitors than alcohols, with vinyl tris (2-methoxyethoxy) silane producing the best results. DTA studies were performed using a near-stoichiometric amount of lead chromate as oxidant. Comparable combustion behaviour was observed when both the fuel and the oxidant powders were either uncoated or silane modified. Mixtures of neat oxidant with silane coated silicon showed poor burn behaviour and this was attributed to poor particle-particle mixing owing to the mismatch in surface energies.

show abstract

“…H 2 + air gas mixtures can support deflagration in the concentration range 4 % -75 % (volume hydrogen fuel basis) [5].…”

Section: Introductionmentioning

confidence: 99%

Suppressing H₂Evolution by Silicon Powder Dispersions

Tichapondwa

Kaci

Fabbro

et al. 2011

Journal of Energetic Materials

View full text Add to dashboard Cite

show abstract

“…Since the hydrogen lower flammability limit for isotropic flame propagation is 0.08 (Carcassi & Fineschi, 2005), the ignition regions have been selected fulfilling the requirement that the minimum volumetric concentration of the flammable mixture in the region is 0.08.…”

Section: Combustionmentioning

confidence: 99%

Numerical analysis of release, dispersion and combustion of liquid hydrogen in a mock-up hydrogen refuelling station

Baraldi

Venetsanos

Papanikolaou

et al. 2009

Journal of Loss Prevention in the Process Industries

View full text Add to dashboard Cite

“…This is largely because concentrations of hydrogen gas in air above 4% are highly explosive [2] and therefore rapid leak detection is a mandatory safety feature. Hydrogen gas sensing has been demonstrated by functionalized carbon nanotubes (CNTs) [3], [4] and graphene [5].…”

Section: Introductionmentioning

confidence: 99%

A Hydrogen Sensor Based on Graphitic Carbon

Moafi¹,

Partridge²,

Sadek³

et al. 2011

IEEE Sensors J.

View full text Add to dashboard Cite

A Pt/oriented graphitic carbon heterojunction has been fabricated and tested as a conductometric hydrogen gas sensor. The carbon layer, deposited between planar Au substrate contacts using a filtered cathodic vacuum arc (with an applied substrate bias of 500 V), has a low density of 1.7 g/cm 3 and with 67% of the atoms bonded in 2 or graphitic configurations. Electron diffraction analysis showed evidence that the film has a microstructure consisting largely of vertically oriented graphitic sheets. These sheets have good through-film electrical conductivity and contributed to a low device resistance of 60 . A 3-nm Pt layer was deposited subsequently on the carbon layer. A change in the device resistance of 2% was exhibited upon exposure to 1% hydrogen gas (in synthetic, zero humidity air) at room temperature. The time for the sensor resistance to decrease by 2% under these conditions was 60 s and the baseline (zero hydrogen exposure) resistance remained constant to within 0.03% during and after the exposure tests.

show abstract

Deflagrations of H2?air and CH4?air lean mixtures in a vented multi-compartment environment

Cited by 49 publications

References 0 publications

Suppressing H₂Evolution by Silicon Powder Dispersions

Suppressing H₂Evolution by Silicon Powder Dispersions

Numerical analysis of release, dispersion and combustion of liquid hydrogen in a mock-up hydrogen refuelling station

A Hydrogen Sensor Based on Graphitic Carbon

Contact Info

Product

Resources

About

Deflagrations of H2?air and CH4?air lean mixtures in a vented multi-compartment environment

Cited by 49 publications

References 0 publications

Suppressing H2Evolution by Silicon Powder Dispersions

Suppressing H2Evolution by Silicon Powder Dispersions

Numerical analysis of release, dispersion and combustion of liquid hydrogen in a mock-up hydrogen refuelling station

A Hydrogen Sensor Based on Graphitic Carbon

Contact Info

Product

Resources

About

Suppressing H₂Evolution by Silicon Powder Dispersions

Suppressing H₂Evolution by Silicon Powder Dispersions