Effects of flow field on the wall mass transfer rate behind a circular orifice in a round pipe

• Published in: International journal of heat and mass transfer Vol. 73; pp. 542 - 550
• Main Authors: Shan, Feng, Fujishiro, Atsushi, Tsuneyoshi, Tatsuya, Tsuji, Yoshiyuki
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2014
• Subjects: Constraining; Correlation; Diffusion; Flow-accelerated corrosion; Mass transfer; Orifice flow; Particle image velocimetry; Pipe; Proper Orthogonal Decomposition; Separated flow; Wall mass transfer; Walls; Separated flow; Orifice flow; Wall mass transfer; Flow-accelerated corrosion
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2014.02.039

We simultaneously measured the flow field and wall mass transfer rate behind an orifice by means of particle image velocimetry (PIV) and the limiting diffusion current technique (LDCT), respectively. The spatio-temporal correlation coefficients of the local vertical velocity and the wall mass transfer are presented, and the canonical correlations between the proper orthogonal decomposition (POD) spatial eigenmodes in the recirculation region and the wall mass transfer rate are also discussed. A response time lag occurs between the wall mass transfer rate and the velocity field. The large canonical correlation between the POD eigenmodes and wall mass transfer rate suggests that large-scale flow structures are important to the wall mass transfer rate. In addition, the second eigenmode in the recirculation region is responsible for the peak of the mean wall mass transfer rate.