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International Journal of Energetic Materials and Chemical Propulsion

Publicou 6 edições por ano

ISSN Imprimir: 2150-766X

ISSN On-line: 2150-7678

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 0.7 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00016 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.18 SJR: 0.313 SNIP: 0.6 CiteScore™:: 1.6 H-Index: 16

Indexed in

CHARACTERIZATION AND DIAGNOSTICS OF SINGLE PARTICLES OXIDIZED IN AN ELECTRODYNAMIC CHAMBER

Volume 3, Edição 1-6, 1994, pp. 313-326
DOI: 10.1615/IntJEnergeticMaterialsChemProp.v3.i1-6.330
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RESUMO

The aims of this study are (1) to present the further development of some of the characterization methods used with the electrodynamic chamber (EDC) for high-temperature studies of single particles and (2) to present in a qualitative manner new results on char oxidation under kinetically controlled conditions. The following methods were either developed or improved: (1) shadowgraphy for size and shape measurements; (2) two-dimensional Mie scattering for sizing and determining optical properties; (3) drag force measurements (by forced convection) for determination of density; and (4) optical pyrometry using wide-band detectors in the visible and infrared regions for temperature determination. In this study, synthetic char particles, spherically shaped (Spherocarb - of very high porosity), as well as spherical polystyrene particles (with no porosity) were oxidized in atmospheric air. The particles were suspended in the center of the EDC and heated by a CO2 laser beam. The particles were characterized prior to reaction by the above methods. Mass and size changes as well as particle temperature were measured as functions of time during the oxidation process. The particles were consumed in the following manner: First, they were consumed uniformly, following previous shrinkage observations. At about 60% conversion, non-uniform shrinkage was observed. At 70% conversion, a clear cut on the top of the particle was monitored. At 80% conversion, preferential consumption from the other side of the particle was established, showing a clear disk configuration. At 95% conversion a hole in the center of the disk was developed. Reasons for preferential consumption might be (1) non-uniform radiation of the particle (particle is irradiarted from bottom only) that generated a temperature differential at the particle, or (2) non-uniform evolution of the pore structure even for uniformly heated particles.

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