Title :
Density-permittivity relationships for powdered and granular materials
Author :
Nelson, Stuart O.
Author_Institution :
U.S. Dept. of Agric., Russell Res. Center, Athens, GA, USA
Abstract :
Relationships between the permittivities of powdered or granular solid materials and their bulk densities (density of the air-particle mixture) are discussed. Linear relationships between functions of the permittivity and bulk density are identified that are useful in determining permittivity of solids from measurements of the permittivity of pulverized samples. The usefulness of several dielectric mixture equations for calculating solid material permittivity from measured permittivity of pulverized samples is also discussed. Results of testing linear extrapolation techniques and dielectric mixture equations on pulverized coal, limestone, plastics, and granular wheat and flour are presented. Recommendations are provided for reliable estimation of solid material permittivities or changes in permittivities of powdered and granular materials as a result of changes in their bulk densities.
Keywords :
density; extrapolation; permittivity measurement; powders; bulk densities; density-permittivity relationships; dielectric constant; dielectric loss factor; dielectric mixture equations; granular materials; linear extrapolation techniques; permittivity measurement; powdered materials; pulverized material; solid material permittivity; Density measurement; Dielectric materials; Dielectric measurements; Equations; Extrapolation; Materials reliability; Permittivity measurement; Plastics; Solids; Testing; Density; dielectric constant; dielectric loss factor; dielectric mixture equations; permittivity; powdered materials; pulverized materials;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2005.853346
