Characterization of Pipe-Flow Turbulence and Mass Transfer in a Curved Swirling Flow Behind an Orifice
This paper deals with the extraction of turbulent structure correlated with the wall mass transfer in a curved swirling pipe flow behind an orifice. The cross-sectional velocity field behind the orifice is measured by the Stereo Particle Image Velocimetry (SPIV) and the results are analyzed by the proper orthogonal decomposition (POD). The instantaneous velocity field shows the asymmetric vortex structure in the cross section due to the combined effect of the swirling flow and the secondary flow generated at the upstream elbow. The POD analysis indicates that the highly turbulent flow is generated on the upper left-hand side of the pipe in the lower POD modes suggesting the occurrence of high wall-thinning rate due to the mass transfer enhancement, while that of the higher modes do not show such asymmetry. This result suggests that the lower POD modes of the velocity field contribute to the non-axisymmetric pipe-wall thinning behind an orifice in a curved swirling flow.
KeywordsParticle Image Velocimetry Proper Orthogonal Decomposition Mass Transfer Rate Turbulent Energy Proper Orthogonal Decomposition Mode
- 4.R.B. Dooley, Flow-accelerated corrosion in fossil and combined cycle/HRSG plants. Power Plant Chem. 10, 68–89 (2008)Google Scholar
- 7.N. Fujisawa, T. Yamagata, T. Takano, N. Kanatani, K. Iwata, A. Ishizuka, Experimental and numerical study on pipe-wall-thinning by swirling flow through complex pipeline geometry, in Proceedings of 12th Asian Symposium on Visualization, Tainan, Taiwan, ASV12-K3 (2013)Google Scholar
- 14.NISA, Secondary piping rupture accident at Mihama power station, unit 3, of the Kansai Electric Power Company, Inc. (2005)Google Scholar
- 23.K. Yoneda, R. Morita, M. Satake, I. Inada, Quantitative evaluation of effective factors on flow accelerated corrosion (part 2), Modelling of mass transfer coefficient with hydraulic features at wall. CRIEPI Research Report, No. L07015 (2008) pp. 1–33Google Scholar