Author
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Nelson, Stuart |
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Submitted to: World Congress on Microwave and Radio Frequency Processing
Publication Type: Proceedings Publication Acceptance Date: 7/21/2000 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: The permittivities of pulverized samples of coal and limestone were measured over a range of bulk densities at 11.7 GHz and 20 øC, and were used, along with particle densities, determined by pycnometer measurements, and the Landau & Lifshitz, Looyenga dielectric mixture equation to determine the solid material permittivities. Subsequently, similar measurements were taken on a 35%-65% coal-limestone mixture, and the Landa & Lifshitz, Looyenga equation and the Complex Refractive Index dielectric mixture equation were used to calculate the permittivities of powdered coal, limestone, and the 35%-65% mixture at various bulk densities. Results compared to the measured permittivities showed that the Landau & Lifshitz, Looyenga equation provided much better estimates than the other equation, with errors of 0.15% in predicting the dielectric constants of powdered coal, 1.4% in predicting the dielectric constants of powdered limestone, and 0.5% in predicting the dielectric constants of the coal-limestone mixture. |
