| dc.description.abstract | People often need to store things, so silo is very important in various industries and people′s livelihood. Especially for storing granular materials. The size of the outlet of the silo, the size of the internal particle size and the internal flow field all affect discharge. Under certain conditions, once the clogging is formed. The overall discharge will be permanently stopped, which is a big problem for industry and people′s livelihood.
This research builds a two-dimensional silo, then places a rotating obstacle within a certain height above the outlet, and makes a lateral variation to the left, and then the rotation speed is set with the controller. Fill in the particles with a fixed weight for each experiment. In order to capture the process of experimental particle discharge, a high-speed camera is used for image capture, and use PTV (Particle Tracking Velocimetry) to analyze the image. Then discuss the flow rate, velocity, packing fraction and granular temperature to understand the impact and comparison of adding rotating obstacle to overall discharge.
After experiments, it is found that placing a rotating obstacle will affect the overall particle discharge, and the trends obtained when the obstacle is at different positions are also different. At too low position, the obstacle has the most direct impact on the discharge. When the obstacle at centered state, the clogging formed is not a general type, it directly connected to the obstacle, so the impact of rotation is the most significant. After offsetting the obstacle, there is more space between the top of the outlet and the obstacle. Then the flow rate can be significantly improved within a certain horizontal displacement distance. When the obstacle is at an appropriate height, the rotation can provide horizontal velocity for the particles, so that the collision between the particles can reduce the clogging happened. The horizontal displacement of the obstacle can still make the particle discharge have different trends. Finally, through experimental statistics, determine the best position of the obstacle and understand its flow behavior. | en_US |