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Measurement Accuracy of a Mono-fiber Optical Probe in a Bubbly Flow
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SYSNO ASEP 0343074 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Measurement Accuracy of a Mono-fiber Optical Probe in a Bubbly Flow Author(s) Vejražka, Jiří (UCHP-M) RID, ORCID, SAI
Večeř, M. (CZ)
Orvalho, Sandra (UCHP-M) RID, ORCID, SAI
Sechet, Ph. (FR)
Růžička, Marek (UCHP-M) RID, ORCID, SAI
Cartellier, A. (FR)Source Title International Journal of Multiphase Flow. - : Elsevier - ISSN 0301-9322
Roč. 36, č. 7 (2010), s. 533-548Number of pages 16 s. Language eng - English Country GB - United Kingdom Keywords optical probe ; bubble-fiber interaction ; void fraction Subject RIV CI - Industrial Chemistry, Chemical Engineering R&D Projects GA104/07/1110 GA ČR - Czech Science Foundation (CSF) GP104/06/P287 GA ČR - Czech Science Foundation (CSF) IAA200720801 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z40720504 - UCHP-M (2005-2011) UT WOS 000278693800002 DOI 10.1016/j.ijmultiphaseflow.2010.03.007 Annotation The measurement accuracy of a mono-fiber optical probe is studied experimentally using isolated bubbles rising freely in a still liquid. The dwell time of the probe tip within the gas phase, which is obtained from both the optical probe signal and high-speed visualization, is compared with the dwell time expected for a non-perturbed bubble. The measurement error results mainly from the intrusive nature of the optical probe, which modifies the behavior of the bubble when it comes into contact with the probe tip. The measured dwell time therefore differs from its ideal value that would be found with an unperturbed bubble. For a wetting liquid, the interaction increases the dwell time if the bubble is pierced near its pole, and shortens it for piercing near the equator. It is shown that the error can be correlated with a modified Weber number, and this correlation is helpful for sensor selection and for uncertainty estimate. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2011
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