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Investigation of granule moisture measurement by a microwave resonant cavity sensor

The moisture of granules is a critical parameter, which has a significant influence on drying, granulation and coating processes of fluidized beds. Microwave is sensitive to the moisture content in granules because of significant change in dielectric constant with moisture content. Measurement of moisture content in granules using a microwave resonant cavity sensor (MRC) is proposed. Static measurements are carried out using a Vector Network Analyzer (VNA) for air/granule mixture with corn or cellulose granules. Experiment results show correlation between the moisture content of granules and the measured resonant frequency. However, due to the influence of the complexity air/granule mixture, the measured resonant frequency cannot be directly correlated to the moisture content of the granules. The void fraction related to flow pattern is a critical parameter to connect the measured resonant frequency and the moisture content for a specific granule. A combination of electrical capacitance tomography (ECT) and MRC dual-modality is suggested as ECT can obtain the flow pattern and void fraction by imaging.