QUANTITATIVE CAPACITIVE MEASUREMENTS OF VOIDAGE IN GAS-SOLID FLOWS
- 1 January 1989
- journal article
- research article
- Published by Taylor & Francis in Particulate Science and Technology
- Vol. 7 (1-2), 51-59
- https://doi.org/10.1080/02726358908906523
Abstract
New capacitance probes were developed for quantitative, time-dependent measurements of voidage in gas-solid flows. Based on a unique guard circuit which nearly eliminates all stray and cable capacitances, these probes are fast (2 kHz) and they do not require in situ calibration. Two configurations were studied: small parallel plates for recording voidage profiles, and a non-intrusive design for local voidage measurements near a wall Static tests were performed using a fixed bed of known voidage and dielectric constant. The probes were also demonstrated in a two-dimensional fluidized bed of glass beads.Keywords
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