Void fraction estimation using a simple combined wave gauge system under breaking waves
- Authors
- Na, Byoungjoon; Son, Sangyoung
- Issue Date
- 1-12월-2021
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Breaking wave; Capacitance-type wave gauge; Energy dissipation; Resistance-type wave gauge; Void fraction
- Citation
- OCEAN ENGINEERING, v.241
- Indexed
- SCIE
SCOPUS
- Journal Title
- OCEAN ENGINEERING
- Volume
- 241
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135503
- DOI
- 10.1016/j.oceaneng.2021.110059
- ISSN
- 0029-8018
- Abstract
- In this study, a unique experimental technique that is capable of quantifying void fraction under two-phase airwater flows based on simple combined resistance and capacitance wave gauge system is described and the subsequent applications are discussed. The technique is validated under various surf-zone breaking waves of different wave periods and wave heights in the 2-dimensional wave flume. The difference in the measured surface elevations by capacitance and resistance wave gauges is positively linked to the depth of aeration and depth-averaged void fraction, that is validated by the corresponding images. The measured depth-averaged void fraction at the passage of the air cavity formed by the overturning jet after breaking showed a distinct pattern in regular and cnoidal waves which is attributed to different amount of droplets generated during the jet-curling process. Based on wavelet analysis, the peak frequency-wave continuously spreads its energy to its superharmonic components due to shoaling while instantaneous spreads of wave energy to the higher harmonics are superposed due to breaking and subsequent jet-overturning. Considering void fraction, a sharper decay of wave energy within the intensely aerated region immediately after breaking is observed and the dissipated energy is reduced as the wave steepness increases following an exponential decay.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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