Improved spatial filtering velocimetry and its application in granular flow measurement

Kong Ping¹, Wang Bi-De², Wang Peng^{1, 3}, Zivkovic V⁴, Zhang Jian-Qing^{5, †}

(a) Axial speed distribution of 1-mm particles flow in different length cylinders at 2.5 rpm. (b) Axial speed distribution of particles flow for different particle sizes at 3.7 rpm. The particle filling degree is 40%, and the measurement area was set at 40 mm from upper end of the granular flow.