The equivalent electrical permittivity of gas-solid mixtures at intermediate solid volume fractions.

Technical Report · Fri Jul 01 04:00:00 EDT 2005

DOI:https://doi.org/10.2172/876324· OSTI ID:876324

Torczynski, John Robert; Ceccio, Steven Louis; Tortora, Paul Richard

Several mixture models are evaluated for their suitability in predicting the equivalent permittivity of dielectric particles in a dielectric medium for intermediate solid volume fractions (0.4 to 0.6). Predictions of the Maxwell, Rayleigh, Bottcher and Bruggeman models are compared to computational simulations of several arrangements of solid particles in a gas and to the experimentally determined permittivity of a static particle bed. The experiment uses spherical glass beads in air, so air and glass permittivity values (1 and 7, respectively) are used with all of the models and simulations. The experimental system used to measure the permittivity of the static particle bed and its calibration are described. The Rayleigh model is found to be suitable for predicting permittivity over the entire range of solid volume fractions (0-0.6).

• Research Organization: Sandia National Laboratories
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 876324
• Report Number(s): SAND2005-4648
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALIBRATION
DIELECTRIC MATERIALS
Dielectric measurements.
GLASS
Gas dynamics-Mathematical models.
MIXTURES
PERMITTIVITY