| dc.description.abstract | This study investigates the interaction effects of shock waves between two circular cylinder obstacles in supercritical granular flow using an open inclined chute as the experimental equipment. Different experimental control parameters, such as the inclination angle of the chute and the spacing between the cylinders, are used to investigate the shock wave interaction after the granular media impacts obstacles. A camera perpendicular to the surface of the chute will be used to record the free surface granular flow images, and particle image velocimetry (PIV) is employed to calculate the velocity fields. The fluid depth is measured using a laser scanner combined with an encoder. The experimental results analyze the variations in fluid depth, mean velocity, fluctuation velocity, granular temperature, and Froude number. According to these analysis parameters, we also established correlations between each other.
From the results, it is observed that the granular flow experience discontinuous changes in fluid depth with sudden increases and decreases in velocity after shock waves. When two shock waves interact with each other, the fluid depth increases even higher, and the influence range becomes larger. At low inclination angles, the maximum fluid depth, average fluctuation velocity, and average granular temperature decrease with the increase in cylinder spacing. Conversely, at high inclination angles, these parameters increase with increasing cylinder spacing. The results show that the increase in fluctuation velocity and granular temperature will cause the granular flow field to become dilute. The expansion behavior of the fluid will further increase the maximum fluid depth. Finally, we identified different flow types from the depth profile of the flow field. It can be seen from the phase diagram that the flow type is related to the minimum Froude number. | en_US |