Measurement of void fraction and bubble speed of slug flow with three-ring conductance probes
SCIE
SCOPUS
- Title
- Measurement of void fraction and bubble speed of slug flow with three-ring conductance probes
- Authors
- Kim, J; Ahn, YC; Kim, MH
- Date Issued
- 2009-06
- Publisher
- ELSEVIER SCI LTD
- Abstract
- This study is aimed at the development of three-ring conductance probes and their related electronics to measure the void fraction in a gas-liquid flow, and at the development of theoretical model of conductance probes for uneven liquid film thickness such as slug flow. A three-ring probe is insensitive to liquid temperature, so the theory of conductance probes indicates that a probe with three rings should be more reliable than a two-ring probe, but this prediction has never been investigated experimentally. Therefore, we conducted an experiment which measured the void fraction, shape, and velocity of a single slug bubble in a vertical 25.4 mm-diameter circular tube equipped with two three-ring conductance probes. The three-ring conductance probes were insensitive to variations in the liquid temperature, while the two-ring probe showed a 2% increase in conductance per degrees C increase at 20 degrees C. We also present a theoretical model of an inclined liquid film, whose thickness is non-uniform and which is observed near the head of a slug bubble. This model was used to predict signals from a conductance probe. In an experiment with a precisely machined solid slug, the model gave the representative position or time corresponding to the measured void fraction. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
- Keywords
- Slug flow; Void fraction; Bubble speed; Conductance probe; Impedance probe; Three-ring probe; LIQUID FRACTION; 2-PHASE FLOW; DESIGN
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/28584
- DOI
- 10.1016/j.flowmeasinst.2009.02.001
- ISSN
- 0955-5986
- Article Type
- Article
- Citation
- FLOW MEASUREMENT AND INSTRUMENTATION, vol. 20, no. 3, page. 103 - 109, 2009-06
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