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http://dx.doi.org/10.3741/JKWRA.2015.48.7.535

Application of Image Technique and Optical Fiber Sensor for Air-water Mixture Flow  

Ryu, Yonguk (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Jung, Tae-Hwa (Department of Civil and Environmental Engineering, Hanbat National University)
Publication Information
Journal of Korea Water Resources Association / v.48, no.7, 2015 , pp. 535-543 More about this Journal
Abstract
Measurements of multiphase flows containing bubbles have been limited because most existing methods target one phase flows. Especially, multiphase flows with a high void ratio have been rarely successful in measurements due to the sudden change of density and thick interfaces between air and water. This study introduces two methods that are capable of measuring flow fields regardless of bubble void ratio, named bubble image velocimetry and bundle fiber optic flow meter. The calculation of the depth of field is suggested to reduce and estimate errors by perspective image velocimetry. The bundle fiber optic flow meter is designed to increase a measurement rate using many optical fibers with a thin diameter. The two methods measured bubble plumes to test reliability and the velocity measurements show good agreement. In addition a hydraulic jump, one of the multiple flows in rivers was measured to test applicability of the methods.
Keywords
Multi-phase flows; Image velocimetry; Shadowgraphy; Optical fiber; Hydraulic jump;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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