Applying the rule of laminar flow in the gap between two parallel disks, the theoretical model of a new type MR damper is established, the damping characteristic and structural characteristic of the MR damper are anal...Applying the rule of laminar flow in the gap between two parallel disks, the theoretical model of a new type MR damper is established, the damping characteristic and structural characteristic of the MR damper are analyzed. Experimental results show that the model can reflect the fundamental characteristics of the disk-gap MR damper.展开更多
Cold plasma technology was used to treat the surface of carbon fibers braided by PET in this paper and SEM wasused to analyze the fracture microstructure of composite interlaminar shear stress (ILSS). The result shows...Cold plasma technology was used to treat the surface of carbon fibers braided by PET in this paper and SEM wasused to analyze the fracture microstructure of composite interlaminar shear stress (ILSS). The result shows that thesurface polarity of carbon fibers was modified by cold plasma treatment, which increases the impregnation of PETbraided carbon fibers during the process of resin flowing, improves the interfacial properties of RTM composites, andtherefore enhances the mechanical properties of the KTM composites.展开更多
The three-dimensional (3D) lattice Boltzmann models,3DQ15,3DQ19 and 3DQ27,under different wall boundary conditions and lattice resolutions have been investigated by simulating Poiseuille flow in a circular cylinder fo...The three-dimensional (3D) lattice Boltzmann models,3DQ15,3DQ19 and 3DQ27,under different wall boundary conditions and lattice resolutions have been investigated by simulating Poiseuille flow in a circular cylinder for a wide range of Reynolds numbers.The 3DQ19 model with improved Fillippova and Hanel (FH) curved boundary condition represents a good compromise between computational efficiency and reliability.Blood flow in an aortic arch is then simulated as a typical haemodynamic application.Axial and secondary fluid velocity and effective wall shear stress profiles in a 180 bend are obtained,and the results also demonstrate that the lattice Boltzmann method is suitable for simulating the flow in 3D large-curved vessels.展开更多
In this paper, by solving the fundamental equations of periodically oscillatory blood flow, the distributions of pressure gradient and blood velocity in varying-area elastic vessel were obtained, and then the wall she...In this paper, by solving the fundamental equations of periodically oscillatory blood flow, the distributions of pressure gradient and blood velocity in varying-area elastic vessel were obtained, and then the wall shear stress and its gradient were calculated. As an example, the pulsatile blood flow in human carotid was analyzed and the effects of vessel taper angle on the distribution of wall shear stress and its gradient were discussed in detail. Numercial results show that the wall shear stress will enlarge when the taper angle increases. Meantime, no matter whether the vessel is converging or diverging, with the increase of the absolute value of taper angle, the amplitude of wall shear stress gradient will enlarge significantly.展开更多
基金This project is supported by National Natural Science Foundation of China (No.50135030).
文摘Applying the rule of laminar flow in the gap between two parallel disks, the theoretical model of a new type MR damper is established, the damping characteristic and structural characteristic of the MR damper are analyzed. Experimental results show that the model can reflect the fundamental characteristics of the disk-gap MR damper.
文摘Cold plasma technology was used to treat the surface of carbon fibers braided by PET in this paper and SEM wasused to analyze the fracture microstructure of composite interlaminar shear stress (ILSS). The result shows that thesurface polarity of carbon fibers was modified by cold plasma treatment, which increases the impregnation of PETbraided carbon fibers during the process of resin flowing, improves the interfacial properties of RTM composites, andtherefore enhances the mechanical properties of the KTM composites.
基金Project supported by the National Natural Science Foundation of China(Grant No10274006)Education Ministry of China(Grant No03011)
文摘The three-dimensional (3D) lattice Boltzmann models,3DQ15,3DQ19 and 3DQ27,under different wall boundary conditions and lattice resolutions have been investigated by simulating Poiseuille flow in a circular cylinder for a wide range of Reynolds numbers.The 3DQ19 model with improved Fillippova and Hanel (FH) curved boundary condition represents a good compromise between computational efficiency and reliability.Blood flow in an aortic arch is then simulated as a typical haemodynamic application.Axial and secondary fluid velocity and effective wall shear stress profiles in a 180 bend are obtained,and the results also demonstrate that the lattice Boltzmann method is suitable for simulating the flow in 3D large-curved vessels.
基金Project supported by the National Natural Science Foundation of China. (Grant No: 10132020)
文摘In this paper, by solving the fundamental equations of periodically oscillatory blood flow, the distributions of pressure gradient and blood velocity in varying-area elastic vessel were obtained, and then the wall shear stress and its gradient were calculated. As an example, the pulsatile blood flow in human carotid was analyzed and the effects of vessel taper angle on the distribution of wall shear stress and its gradient were discussed in detail. Numercial results show that the wall shear stress will enlarge when the taper angle increases. Meantime, no matter whether the vessel is converging or diverging, with the increase of the absolute value of taper angle, the amplitude of wall shear stress gradient will enlarge significantly.
