Study on the Internal Flow of Marine Sewage Outfalls with PIV System
Saline intrusion into marine sewage outfalls will greatly decrease the efficiency of sewage disposal, especially in some early-constructed structures without special safe-guard measures. In this paper a simplified physical model of the sewage outfall was built in the laboratory to investigate the mechanisms of saline intrusion and purging flow in the system. The PIV (Particle Image Velocimetry) technique was selected to measure the velocity-fields of this internal flow. In order to present the flow characteristics at different inflowing sewage discharges, three series of velocity-fields were measured with PIV. The development of flow patterns at different inflowing sewage discharges and the mechanisms of saline intrusion and purging were analyzed. For An outfall system with certain structure, the inflowing sewage discharge was a decisive factor that affected the internal flow pattern. The internal flow during saline intrusion and purging was three-dimensional, unsteady, density stratified and with intense interfacial entrainment and turbulent mixing. The measured velocity-fields indicated that the interfacial entrainment and turbulent mixing were two main mechanisms to extrude the saline from the system and these two mechanisms would take different proportions due to the different inflowing momentum.
Wu Wei
Suzhou University of Science and Technology, 1701 Binhe Road, Suzhou, 215011
国际会议
南京
英文
518-525
2010-09-13（万方平台首次上网日期，不代表论文的发表时间）