The performance of electromagnetic flowmeters in a liquid metal two-phase flow
SCIE
SCOPUS
- Title
- The performance of electromagnetic flowmeters in a liquid metal two-phase flow
- Authors
- Cha, JE; Ahn, YC; Se, KW; Nam, HY; Choi, JH; Kim, MH
- Date Issued
- 2003-10
- Publisher
- ATOMIC ENERGY SOC JAPAN
- Abstract
- In order to investigate the characteristics of an electromagnetic flowmeter in a liquid metal two-phase flow, AC electromagnetic flowmeters were designed and manufactured. Two-phase flow experiments, encompassing bubbly to slug flow regimes, were realized with a water-air mixture and a liquid sodium-nitrogen mixture, respectively. The relation DeltaU(TP)=DeltaU(SP)/(1 -alpha), between the flow induced electromotive force (e.m.f.) of a single-phase flow and that of a two-phase flow, was verified by the measured e.m.f.s and the void fraction alpha for a bubbly flow regime. Whereas there is no difference in the shape of the flow induced e.m.f. between single-phase and bubbly flow, the signal amplitude of the bubbly flow is greater than that of the single-phase flow under the same water or liquid sodium flow rate, since the real liquid velocity is higher than that of the single-phase flow. In the case of a slug flow, the phase and the amplitude of the flowmeter output changed drastically when a slug bubble passed through the flowmeter. Therefore, the electromagnetic flowmeter shows good potential as a useful device for identifying the flow regimes. The void fraction in a bubbly flow can be measured using two electromagnetic flowmeters.
- Keywords
- liquid metal; two-phaseflow; water-air two-phaseflow; sodium-nitrogen two-phaseflow; void fraction; electromagnetic flowmeter; bubbly flow; slug flow; flow pattern
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/18212
- DOI
- 10.3327/jnst.40.744
- ISSN
- 0022-3131
- Article Type
- Article
- Citation
- JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, vol. 40, no. 10, page. 744 - 753, 2003-10
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