Assessment of an ultrasonic sensor and a capacitance probe for measurement of two-phase mixture level

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We perform a comparison of two-phase mixture levels measured by an ultrasonic sensor and a two-wire type capacitance probe with visual data under the same experimental conditions. A series of experiments are performed with various combinations of airflow and initial water level using a test vessel with a height of 2 m and an inner diameter of 0.3 m under atmospheric pressure and room temperature. The ultrasonic sensor measures the two-phase mixture level with a maximum error of 1.77% with respect to the visual data. The capacitance probe severely under-predicts the level data in the high void fraction region. The cause of the error is identified as the change of the dielectric constant as the void fraction changes when the probe is applied to the measurement of the two-phase mixture levels. A correction method for the capacitance probe is proposed by correcting the change of the dielectric constant of the two-phase mixture. The correction method for the capacitance probe produces a r.m.s. error of 5.4%.
Publisher
ATOMIC ENERGY SOC JAPAN
Issue Date
2004-12
Language
English
Article Type
Article
Citation

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, v.41, no.12, pp.1187 - 1191

ISSN
0022-3131
DOI
10.3327/jnst.41.1187
URI
http://hdl.handle.net/10203/85312
Appears in Collection
NE-Journal Papers(저널논문)
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