The main objective of this study was to investigate the particle deposition in a low-speed tunnel flow excited by piezoelectric plates experimentally. The controlling parameters were flow speed, excitation frequency, input voltage and the setting position of plates. The Reynolds numbers base on the exit height H=30mm were 111 and 133 corresponding to two flow speeds. The quantitative analysis was done by measuring the difference of weights between seeded and outflow particles. The results revealed that the decrement of deposition was due to higher flow speed and lower oscillating frequency. Similar results were also been obtained by comparing the peak-to-peak distance and the amplitude of the wavy shaped distributions of sediments on the wall. Stronger fluctuations were observed downstream of the plates measured using hot-wire anemometry. The spectra distribution also revealed that the variation of the excitation frequency affected the downstream flow field more than between each other. In addition, the deposition was increased by the strong interaction of the plates while they were closely placed.
Journal of Aeronautics,Astronautics and Aviation, Series B 43(1), pp.11-17