Abstract
The experiments are carried out in a three-dimensional channel with a screw conveyor, which plays the role of granular drives for the granular flow system and determines the injection of granular in the test target section. The jam-to-dense transition of granular flow is studied with the different inclination angle. The results show that, with a fixed diameter of hopper orifice and initial filling position, there is a change from jam to dense when the inclination angle larger than 22°. Variation of the flow rate with elevated frequency of the screw conveyor is further studied. The flow pattern is changed from dilute to dense with increasing rotation frequency of the screw rod. When the rotation frequency is larger than 5 Hz, the flow is dense. The dynamic balance of the interface between dilute to dense granular is observed in the main target section. We further research the dynamic interface by measuring the highest and lowest location with time and also simulate the gravity flow rate and screw conveyor flow rate with EDEM. From the results, we find that the interface between dilute flow and dense flow is influenced by the combined action of crew conveyor flow and dense gravity flow.
Highlights
An accelerator-driven subcritical system (ADS) is a subcritical blanket driven by neutrons produced when a highintensity proton beam bombards a high-power spallation target, and the concept has been developed over 30 years [1,2,3,4]. e spallation target, usually compared to the heart of the accelerator-driven subcritical system (ADS), produces primary neutron sources for the subcritical core
E incline angle “theta” is the angle between the inclined pipe and the horizontal plane. e flow pattern was changed from dilute to dense with increasing elevate frequency. e rotation of screw rod of screw conveys is driven by a motor. erefore, we consider the frequency of the rotation of screw rod as a variable to investigate the transformation between dilute flow and dense flow. e dynamic balance of the interface between dilute to dense granular is observed in the main target section
We found that the dynamic balance of the interface between dilute to dense granular is observed in the main target section. e incline angle “theta” is the only adjustable parameter
Summary
An accelerator-driven subcritical system (ADS) is a subcritical blanket driven by neutrons produced when a highintensity proton beam bombards a high-power spallation target, and the concept has been developed over 30 years [1,2,3,4]. e spallation target, usually compared to the heart of the accelerator-driven subcritical system (ADS), produces primary neutron sources for the subcritical core. An accelerator-driven subcritical system (ADS) is a subcritical blanket driven by neutrons produced when a highintensity proton beam bombards a high-power spallation target, and the concept has been developed over 30 years [1,2,3,4]. If the heat deposited can be dealt offline, the upper limit of the target power will be increased significantly Based on this concept, there are various kinds of targets that have been designed, constructed, and operated, such as heavy liquid metal targets in about 1-MW megawatt pilot experiment (MEGAPIE) and spallation neutrons sources (SNS) projects [5, 6]. Our study can be a typical paradigm for the dilute-to-dense transition of granular flow under gravity form three-dimensional hopper. E incline angle “theta” is the angle between the inclined pipe and the horizontal plane. e flow pattern was changed from dilute to dense with increasing elevate frequency. e rotation of screw rod of screw conveys is driven by a motor. erefore, we consider the frequency of the rotation of screw rod as a variable to investigate the transformation between dilute flow and dense flow. e dynamic balance of the interface between dilute to dense granular is observed in the main target section
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