Correlation of Volume Ratio and Normalized Permittivity in Particle Mixture

The volume ratio in the total solid particle mixture is an important parameter indicating the characteristics of particulate mixtures. Therefore, a simple measurement method is desirable. In this paper, the normalized permittivities of two groups of particle mixtures are tested using electrical capacitance tomography (ECT) with the series and parallel models. The experimental results show that normalized permittivity changes obtained from the series ECT model have a very strong linear relationship with the volume ratio of higher permittivity materials in the mixture. The Maxwell Garnett formula can predict the normalized permittivity only after the permittivity of each type of particle is known. The comparison between two methods suggests that ECT with the series model is a better way to monitor the volume ratio in mixtures comprising two different types of solid particle.