Decompositions of bubbly flow PIV velocity fields using discrete wavelets multi-resolution and multi-section image method
Currently, wavelet transforms are widely used for the analyses of particle image velocimetry (PIV) velocity vector fields. This is because the wavelet provides not only spatial information of the velocity vectors, but also of the time and frequency domains. In this study, a discrete wavelet transfor...
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| Veröffentlicht in: | Nuclear engineering and design 2008-08, Vol.238 (8), p.2055-2063 |
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| container_title | Nuclear engineering and design |
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| creator | Choi, Je-Eun Takei, Masahiro Doh, Deog-Hee Jo, Hyo-Jae Hassan, Yassin A. Ortiz-Villafuerte, Javier |
| description | Currently, wavelet transforms are widely used for the analyses of particle image velocimetry (PIV) velocity vector fields. This is because the wavelet provides not only spatial information of the velocity vectors, but also of the time and frequency domains. In this study, a discrete wavelet transform is applied to real PIV images of bubbly flows. The vector fields obtained by a self-made cross-correlation PIV algorithm were used for the discrete wavelet transform. The performances of the discrete wavelet transforms were investigated by changing the level of power of discretization. The images decomposed by wavelet multi-resolution showed conspicuous characteristics of the bubbly flows for the different levels. A high spatial bubble concentrated area could be evaluated by the constructed discrete wavelet transform algorithm, in which high-leveled wavelets play dominant roles in revealing the flow characteristics. |
| doi_str_mv | 10.1016/j.nucengdes.2007.11.020 |
| format | Article |
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| language | eng |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Applied sciences Controled nuclear fusion plants Energy Energy. Thermal use of fuels Exact sciences and technology Fission nuclear power plants Fuels Installations for energy generation and conversion: thermal and electrical energy Nuclear fuels |
| title | Decompositions of bubbly flow PIV velocity fields using discrete wavelets multi-resolution and multi-section image method |
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