SIMULTANEOUS MEASUREMENTS OF PARTICLE SETTLING VELOCITY AND OSCILLATNG-GRID TURBULENCE
Turbulence influence on the settling behavior of solid particles has attracted significant research efforts in the past decades, but remains challenging due to limitations in experimental techniques, especially in simultaneous two-phase measurements. In this study, a digital PIV system with enhanced shadow processing function was employed to conduct simultaneous velocity measurements of individual solid particles driven by gravity and the ambient fluid in a confined turbulent environment. The experiments were conducted in a water tank with turbulence generated by a grid oscillating in the vertical direction. Several types of grains, varying in shape and size, were tested with different oscillating frequencies. Settling behavior of solid particles subjected to ambient turbulent flow was analyzed in three aspects, i.e. settling velocity, relative settling velocity and settling velocity fluctuation, with respect to the simultaneous turbulent flow conditions. A small dynamic observation frame was first adopted for detailed flow sampling and the effect of secondary flow was also discussed.
settling velocity turbulence oscillating grid PIV
Qi Zhou Niansheng Cheng
School of Civil and Environmental Engineering, Nanyang Technological University, Nanyang Avenue Singapore 639798
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
913-918
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）