Visualization of Time-Space Dominant Particle from CT Images Using 3D Wavelets Transform

- Comparison Between Non-Choking and Pseudo Choking

Masahiro TAKEI 1, Hui LI 2, Mitsuaki OCHI 1, Yoshifuru SAITO 3

Kiyoshi HORII 4, Tomasz DYAKOWSKI 5

1 Nihon University, Dept of Mech.Eng. 1-8-14 Kanda Surugadai Tokyo 101-8308 Japan, takei@mech.cst.nih0n-u.ac.jp

2 Kagoshima University, Kagoshima Japan, 3 Hosei University, Tokyo Japan

4 Shirayuri College, Tokyo Japan, 5 UMIST, Manchester UK

ABSTRACT

The concept to extract dominant particle density fluctuation in various time-space frequency levels on a pipeline cross section has been launched using a capacitance-computed tomography and three- dimensional discrete wavelets transform. With this concept, particle density fluctuation at the downstream of a pipe bend is decomposed to time-space levels in a non-choking state and a pseudo choking state. As a result, this concept enables the time and position when and where particle density fluctuations with dominant time-space levels pass through the pipeline to be determined.

Keywords Capacitance CT, 3D wavelets transform, Solid air two phase flow, Particle density Fluctuation