Error Analysis of Flow Velocity Measured through Granular PIV Based on Interrogation Area, Frame Per Second, and Video Resolution

초록

Research on general particle image velocimetry (PIV) has been conducted extensively, but studies on granularPIV are relatively insufficient. In addition, the parameters used for analyzing granular PIV need to be optimized. In this study, we analyzed the error of velocity measurements based on the interrogation area (64–192 pixel),frame per second (30–120 FPS), and video resolution [ultrahigh definition (UHD) and high definition (HD)]within the velocity range typically measured in hoppers. The estimated errors of the granular PIV were below5%, which is generally acceptable. However, considering the data reliability, the flow velocity in the hoppercould be measured with less than 5% error at 120 FPS or higher in the HD resolution and 30 FPS or higher inthe UHD resolution.

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