The Experts below are selected from a list of 9501 Experts worldwide ranked by ideXlab platform
Lei Yang - One of the best experts on this subject based on the ideXlab platform.
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preliminary research on flow rate and free surface of the accelerator driven Subcritical System gravity driven dense granular flow target
PLOS ONE, 2017Co-Authors: Xiaodong Li, Sheng Zhang, Yanshi Zhang, Guanghui Yang, Mengke Wang, Wenshan Duan, Lei YangAbstract:A spallation target is one of the three core parts of the accelerator driven Subcritical System (ADS), which has already been investigated for decades. Recently, a gravity-driven Dense Granular-flow Target (DGT) is proposed, which consists of a cylindrical hopper and an internal coaxial cylindrical beam pipe. The research on the flow rate and free surface are important for the design of the target whether in Heavy Liquid Metal (HLM) targets or the DGT. In this paper, the relations of flow rate and the geometry of the DGT are investigated. Simulations based on the discrete element method (DEM) implementing on Graphics Processing Units (GPUs) and experiments are both performed. It is found that the existence of an internal pipe doesn’t influence the flow rate when the distance from the bottom of the pipe to orifice is large enough even in a larger System. Meanwhile, snapshots of the free surface formed just below the beam pipe are given. It is observed that the free surface is stable over time. The entire research is meaningful for the design of DGT.
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influence of geometrical and material parameters on flow rate in simplified ads dense granular flow target a preliminary study
Journal of Nuclear Science and Technology, 2016Co-Authors: Jiangfeng Wan, Sheng Zhang, Guanghui Yang, Yuan Tian, Ping Lin, Lei YangAbstract:ABSTRACTThe spallation target is one of the key components of an accelerator-driven Subcritical System (ADS). Following previous designs such as plate targets, rod targets, rotating targets, and liquid metal targets, the gravity-driven dense granular-flow target (DGT), which combines the advantages of solid and liquid metal targets, becomes a new attractive choice. The geometry of DGT consists of a cylindrical hopper and an internal coaxial cylindrical beam pipe. In this paper, using discrete element method simulations on graphics processing units, we research into the relations of the flow rate with the geometrical as well as the material parameters. For geometrical parameters, it is found that the existence of an internal pipe does not influence the flow rate when the distance from the bottom of the pipe to orifice is large enough. The results also reveal how the material parameters influence the flow rate. The whole research is helpful for the design of DGT.
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new concept for ads spallation target gravity driven dense granular flow target
Science China-technological Sciences, 2015Co-Authors: Lei Yang, Wenlong ZhanAbstract:For the Chinese-ADS project, to provide enough neutrons to drive the Subcritical System, tens of MW spallation targets for the C-ADS are necessary. This is not an easy task. Here we propose a new concept for a gravity-driven dense granular flow target, in which heavy metal grains are chosen as the spallation target material. Compared with currently widely used targets, this conceptual design has advantages with regard to heat removal, thermal shock protection, neutron yield, radiotoxicity reduction, and convenient operation. The gravity-driven dense granular flow target has the potential to easily deal with these issues and to form a foundation for tens of MW spallation targets for cost-effective facilities. Preliminary simulations and experiments have been completed to support this conceptual design.
Sheng Zhang - One of the best experts on this subject based on the ideXlab platform.
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preliminary research on flow rate and free surface of the accelerator driven Subcritical System gravity driven dense granular flow target
PLOS ONE, 2017Co-Authors: Xiaodong Li, Sheng Zhang, Yanshi Zhang, Guanghui Yang, Mengke Wang, Wenshan Duan, Lei YangAbstract:A spallation target is one of the three core parts of the accelerator driven Subcritical System (ADS), which has already been investigated for decades. Recently, a gravity-driven Dense Granular-flow Target (DGT) is proposed, which consists of a cylindrical hopper and an internal coaxial cylindrical beam pipe. The research on the flow rate and free surface are important for the design of the target whether in Heavy Liquid Metal (HLM) targets or the DGT. In this paper, the relations of flow rate and the geometry of the DGT are investigated. Simulations based on the discrete element method (DEM) implementing on Graphics Processing Units (GPUs) and experiments are both performed. It is found that the existence of an internal pipe doesn’t influence the flow rate when the distance from the bottom of the pipe to orifice is large enough even in a larger System. Meanwhile, snapshots of the free surface formed just below the beam pipe are given. It is observed that the free surface is stable over time. The entire research is meaningful for the design of DGT.
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influence of geometrical and material parameters on flow rate in simplified ads dense granular flow target a preliminary study
Journal of Nuclear Science and Technology, 2016Co-Authors: Jiangfeng Wan, Sheng Zhang, Guanghui Yang, Yuan Tian, Ping Lin, Lei YangAbstract:ABSTRACTThe spallation target is one of the key components of an accelerator-driven Subcritical System (ADS). Following previous designs such as plate targets, rod targets, rotating targets, and liquid metal targets, the gravity-driven dense granular-flow target (DGT), which combines the advantages of solid and liquid metal targets, becomes a new attractive choice. The geometry of DGT consists of a cylindrical hopper and an internal coaxial cylindrical beam pipe. In this paper, using discrete element method simulations on graphics processing units, we research into the relations of the flow rate with the geometrical as well as the material parameters. For geometrical parameters, it is found that the existence of an internal pipe does not influence the flow rate when the distance from the bottom of the pipe to orifice is large enough. The results also reveal how the material parameters influence the flow rate. The whole research is helpful for the design of DGT.
Guanghui Yang - One of the best experts on this subject based on the ideXlab platform.
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preliminary research on flow rate and free surface of the accelerator driven Subcritical System gravity driven dense granular flow target
PLOS ONE, 2017Co-Authors: Xiaodong Li, Sheng Zhang, Yanshi Zhang, Guanghui Yang, Mengke Wang, Wenshan Duan, Lei YangAbstract:A spallation target is one of the three core parts of the accelerator driven Subcritical System (ADS), which has already been investigated for decades. Recently, a gravity-driven Dense Granular-flow Target (DGT) is proposed, which consists of a cylindrical hopper and an internal coaxial cylindrical beam pipe. The research on the flow rate and free surface are important for the design of the target whether in Heavy Liquid Metal (HLM) targets or the DGT. In this paper, the relations of flow rate and the geometry of the DGT are investigated. Simulations based on the discrete element method (DEM) implementing on Graphics Processing Units (GPUs) and experiments are both performed. It is found that the existence of an internal pipe doesn’t influence the flow rate when the distance from the bottom of the pipe to orifice is large enough even in a larger System. Meanwhile, snapshots of the free surface formed just below the beam pipe are given. It is observed that the free surface is stable over time. The entire research is meaningful for the design of DGT.
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influence of geometrical and material parameters on flow rate in simplified ads dense granular flow target a preliminary study
Journal of Nuclear Science and Technology, 2016Co-Authors: Jiangfeng Wan, Sheng Zhang, Guanghui Yang, Yuan Tian, Ping Lin, Lei YangAbstract:ABSTRACTThe spallation target is one of the key components of an accelerator-driven Subcritical System (ADS). Following previous designs such as plate targets, rod targets, rotating targets, and liquid metal targets, the gravity-driven dense granular-flow target (DGT), which combines the advantages of solid and liquid metal targets, becomes a new attractive choice. The geometry of DGT consists of a cylindrical hopper and an internal coaxial cylindrical beam pipe. In this paper, using discrete element method simulations on graphics processing units, we research into the relations of the flow rate with the geometrical as well as the material parameters. For geometrical parameters, it is found that the existence of an internal pipe does not influence the flow rate when the distance from the bottom of the pipe to orifice is large enough. The results also reveal how the material parameters influence the flow rate. The whole research is helpful for the design of DGT.
Xiaodong Li - One of the best experts on this subject based on the ideXlab platform.
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preliminary research on flow rate and free surface of the accelerator driven Subcritical System gravity driven dense granular flow target
PLOS ONE, 2017Co-Authors: Xiaodong Li, Sheng Zhang, Yanshi Zhang, Guanghui Yang, Mengke Wang, Wenshan Duan, Lei YangAbstract:A spallation target is one of the three core parts of the accelerator driven Subcritical System (ADS), which has already been investigated for decades. Recently, a gravity-driven Dense Granular-flow Target (DGT) is proposed, which consists of a cylindrical hopper and an internal coaxial cylindrical beam pipe. The research on the flow rate and free surface are important for the design of the target whether in Heavy Liquid Metal (HLM) targets or the DGT. In this paper, the relations of flow rate and the geometry of the DGT are investigated. Simulations based on the discrete element method (DEM) implementing on Graphics Processing Units (GPUs) and experiments are both performed. It is found that the existence of an internal pipe doesn’t influence the flow rate when the distance from the bottom of the pipe to orifice is large enough even in a larger System. Meanwhile, snapshots of the free surface formed just below the beam pipe are given. It is observed that the free surface is stable over time. The entire research is meaningful for the design of DGT.
Dajun Fan - One of the best experts on this subject based on the ideXlab platform.
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the temperature control of the dense granular spallation target in china initiative accelerator driven System based on quantum evolutionary algorithm
Progress in Nuclear Energy, 2021Co-Authors: Youpeng Zhang, Cunfeng Yao, Dajun FanAbstract:Abstract The temperature control of the spallation target in accelerator driven Subcritical System is the important issue that has the direct impact on stable and reliable operation of the coupling System. The China initiative accelerator driven Subcritical System (CiADS) is composed by three facilities, including the high power accelerator, dense granular spallation target (DGT) and the Subcritical reactor, where the DGT is the key component in connecting the accelerator and Subcritical reactor, and the gravity driven tungsten alloy granules are considered as the material and coolant for the spallation target. In order to keep the working temperature in normal operation condition around the presetting value without bringing the large perturbation, the intensity of proton beam and the flow speed of tungsten alloy granules are considered as the main control approaches in adjusting the temperature inside the DGT, and the proportional integral derivative (PID) controller has been established based on the two approaches for the better adaptability to the temperature control in spallation target System. Moreover, the simulation method and quantum evolutionary algorithm have been employed for the selection and optimization of main parameters in PID controller in order to substitute the time consuming and error prone tasks in traditional experiential selection process. Finally, the reference control scenarios have been used to demonstrate the feasibility and applicability of optimized method for the temperature control of the DGT System in CiADS.
