The radiation of alumina melt in the visible and near IR spectra upon solidification in the process of cooling in ambient air

Bityukov, V. K.; Vorob’ev, A. Yu.; Петров, В. А.; Titov, V. E.

doi:10.1134/s0018151x08060084

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…were borrowed from [2,21,26]. The specific heat capacity and the true coefficient of thermal conductivity of material of the solid phase (quartz fibers) as functions of temperature were calculated by the following formulas: For the range of spectral values given in [2], the integral coefficients of diffusion of radiation and absorption were taken to be D = 3.8 × 10 -5 m and k = 8 m -1 .…”

Section: Calculation Results and Their Analysismentioning

confidence: 99%

Radiation-conduction heat transfer in fibrous heat-resistant insulation under thermal effect

Zverev

Gol’din

Nazarenko³

2008

High Temp

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The conjugate diffusion model of radiation transfer and the approximation of radiant thermal conductivity are used to investigate the radiation-conduction heat transfer in a flat layer of fibrous heat-resistant insulation under the effect of fire. The results of calculation of the characteristics of unsteady-state heat transfer and of the duration of heat resistance of the substrate demonstrate the accuracy of the approximation of radiant thermal conductivity which is good for practical applications. The fireproof efficiency of fibrous quartz heat insulation is investigated. The calculation results demonstrate that the application of this insulation provides for high limits of fire resistance of metal structures.

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Section: Calculation Results and Their Analysismentioning

confidence: 99%

Radiation-conduction heat transfer in fibrous heat-resistant insulation under thermal effect

Zverev

Gol’din

Nazarenko³

2008

High Temp

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Influence of the target material on secondary plasma formation underwater and its laser induced breakdown spectroscopy (LIBS) signal

Gavrilović

Lazic

Jovičević

2017

J. Anal. At. Spectrom.

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Effects of phase transformation on the ultraviolet optical properties of alumina clusters in aircraft plumes

Bai

et al. 2020

Opt. Express

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Alumina particles experience phase transition as an undercooling process along the plume, during which the liquid alumina clusters transform into multiphase, and then into α phase. The phase transformation model was built by an improved diffusion limited aggregation (DLA) algorithm with monomers of stratified structure. The effects of phase transformation on the ultraviolet optical characteristics of alumina clusters were studied using the superposition T-matrix method (STMM). We found that the alumina clusters in phase transition had completely different optical properties compared with the fixed phase ones. Forward scattering, absorption efficiency and asymmetry parameter gradually decreased, whereas backward scattering, scattering efficiency, and single-scattering albedo gradually increased during the phase transformation process. Besides, multiphase alumina clusters were compared with the other two equivalent models, including the sphere model approximated by equivalent volume sphere (EVS) and the equivalent surface sphere (ESS) approaches and single-phase cluster model approximated by Maxwell-Garnett (MG) and Bruggeman (BR) approaches. Generally speaking, the optical properties of the single-phase cluster approximated by MG and BR approaches were relatively close to those of the real multiphase alumina cluster. Whereas the spheres approximated by EVS and ESS had great deviations, especially when the number of monomers in the cluster was 20, the relative error of scattering efficiency calculated by ESS was up to 52%. Therefore, approximate approaches for multiphase clusters should be chosen cautiously. Our results give further the understanding of the optical properties of alumina clusters. As the phase states are usually closely related to the plume radiation and burning process, these kinds of researches will be helpful to aircraft detection, identiﬁcation, and other related fields.

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The radiation of alumina melt in the visible and near IR spectra upon solidification in the process of cooling in ambient air

Cited by 3 publications

References 6 publications

Radiation-conduction heat transfer in fibrous heat-resistant insulation under thermal effect

Radiation-conduction heat transfer in fibrous heat-resistant insulation under thermal effect

Influence of the target material on secondary plasma formation underwater and its laser induced breakdown spectroscopy (LIBS) signal

Effects of phase transformation on the ultraviolet optical properties of alumina clusters in aircraft plumes

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