Effect of surface tension on the temperature of burning metal droplets

Dreizin, Edward L.

doi:10.1016/j.combustflame.2014.05.017

Cited by 10 publications

(4 citation statements)

References 36 publications

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“…It should be cautioned that the boiling point of a small micron-size metal droplet has been estimated to be several hundred degrees higher than the values used in Fig. 4, which apply to a flat metal surface, due to the strong surface tension of some liquid metals [105].…”

Section: Metal-fuel Combustion Thermodynamicsmentioning

confidence: 99%

Direct combustion of recyclable metal fuels for zero-carbon heat and power

et al. 2015

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Section: Metal-fuel Combustion Thermodynamicsmentioning

confidence: 99%

Direct combustion of recyclable metal fuels for zero-carbon heat and power

et al. 2015

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“…However, the latter assumptions may become inadequate for the case of fine metal particle combustion. For example, it was proposed that for metal droplets, the effect of surface tension, which depends strongly on the droplet size, could elevate the boiling point and, thus, the droplet surface temperature (Dreizin, 2014). Both rate and products formed in the surface reaction can thus be affected.…”

Section: Discussionmentioning

confidence: 99%

Combustion of Mechanically Alloyed Al∙Mg Powders in Products of a Hydrocarbon Flame

Corcoran

Wang

Aly

et al. 2014

Combustion Science and Technology

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Burn times and temperatures were measured optically for a set of mechanically alloyed Al·Mg powders injected into a laminar and a turbulent air-acetylene flame. Magnesium concentrations varied from 10 to 53 mole%; particle sizes were in the range of 1-50 µm. Emission from the burning particles at 700 nm, 800 nm, and 900 nm was captured using three filtered photomultiplier tubes. The burn times were correlated with particle sizes using measured statistical distributions for both times and sizes. The measured trends for burn times, t, as a function of particle size, d, for all alloys were approximated by a t = a·d n law, where the exponent n varied from 0.6 to 1. Shorter burn times were measured in more turbulent flows; respectively, the values of pre-exponent, a, decreased and exponent, n, increased slightly with an increased level of turbulence. An increase in Mg concentration led to longer burn times for the alloy particles for all flame conditions. For all compositions, alloy particles burned longer than similarly sized Al particles except for the alloy with the smallest concentration of Mg, Al 0.9 Mg 0.1 , for which particles less than ∼4 µm burned faster than similarly sized Al. This effect was observed for laminar and turbulent flames. The optically measured temperatures were lower for Al 0.47 Mg 0.53 alloy (∼2400 K) compared to ∼2700-2800 K obtained for other alloys. Turbulent mixing resulted in a slight increase in the measured temperature.

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“…It is widely used in various pyrotechnic products after being mixed with an oxidizer in the powder form. Table compares the properties of magnesium and zinc. , …”

Section: Introductionmentioning

confidence: 99%

“…Table 1 compares the properties of magnesium and zinc. 17,18 Obviously, magnesium has many advantages. When the mass reaction enthalpy is compared, its advantages become more significant because the combustion efficiency is high.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Combustion Behavior of Atomized Zn–Mg Alloy Powder

Zhang

Zhu

Xie³

et al. 2023

ACS Omega

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Using pyrolants instead of warhead charges can release red light and thick smoke for target practice to highlight the safety of the impact point and dud disposal. In order to find the ideal material, the combustion and kinetic properties of two Zn–Mg alloys at critical proportions were investigated. Thermogravimetry/differential scanning calorimetry (TG/DSC) experiments in pure oxygen were conducted with atomized Zn–Mg alloy powder in the ratio of 7:3 and the ratio of 8:2 with three particle diameters under different heating rates. The kinetic parameters of the six materials were obtained by ASTM E698 and Ozawa–Flynn–Wall (OFW) methods, indicating that the activation energy (E α) of the 7:3 Zn–Mg alloy powder was lower than that of the 8:2 Zn–Mg alloy powder when the particle size distributions are similar. By the method of nonlinear multivariate regression, the oxidation reaction of Zn–Mg alloy powder was divided into two steps. The proportion of mass gain of the first-step reaction of 7:3 Zn–Mg alloy powder was 0.462–0.518, and the proportion of mass gain of the first-step reaction of 8:2 Zn–Mg alloy powder was 0.138–0.228. Reaction mechanism functions of the two-step reaction of Zn–Mg alloy oxidation were derived as f(α) = (1 – α) n (1 + k cat·α). The results of combustion experiments showed that the pyrolants composed of 7:3 alloy can burn stably to produce satisfactory smoke and light signals, while the pyrolants composed of 8:2 alloy cannot achieve this. The 7:3 Zn–Mg alloy powder is an ideal ingredient for pyrotechnic compositions.

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Effect of surface tension on the temperature of burning metal droplets

Cited by 10 publications

References 36 publications

Direct combustion of recyclable metal fuels for zero-carbon heat and power

Direct combustion of recyclable metal fuels for zero-carbon heat and power

Combustion of Mechanically Alloyed Al∙Mg Powders in Products of a Hydrocarbon Flame

Kinetics and Combustion Behavior of Atomized Zn–Mg Alloy Powder

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