Abstract
The main purpose of this work is to study the effects of (1) geometry, size and materials of electrodes, (2) flow pattern, and (3) electrode position with respect to a dielectric boundary on the void fraction measurement by capacitance transducers. A set of theoretical relative capacitance formulas for a test section, which is equipped with a pair of strip-type electrodes and in which an annular or stratified flow is present, is derived based on the concept of capacitance in series and parallel. From the experimental results, relationships between the measured relative capacitance and void fraction are obtained for both annular and stratified flow systems under static condition. This result is compared with theoretical predictions. From this study it is found that (1) the strip-type electrodes are more sensitive than ring-type electrodes for both annular and stratified flows, (2) electrode size does not affect the relative capacitance versus ( 1 − α) curve, and (3) electrode position is important for stratified flows but it has no effect on annular flows.
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