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RISS 인기검색어
- 검색키워드
- 저자 : Shangjing Yang (검색결과 4 건)
- 무료
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- 유료
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Magnetohydrodynamic flows in u-shaped ducts under a uniform transverse magnetic field
Yang, Shangjing,Kim, Chang Nyung Elsevier 2017 Fusion engineering and design Vol.121 No.-
<P><B>Abstract</B></P> <P>In this study, the three-dimensional liquid metal (LM) magnetohydrodynamic (MHD) flows in a u-shaped duct under a uniform magnetic field applied perpendicular to the flow plane are numerically analyzed with the use of commercial software CFX. The u-shaped duct system is made up of an inflow channal, an outflow channal and a connecting channel located between the inflow channel and outflow channel. In the current study, the effects of the length of the connecting channel and the conductance ratio on the flow characteristics are investigated. Higher velocities are observed in the side layers of the inflow, outflow and connecting channels, forming “M-shaped” velocity profiles. In addition, the velocity recirculations are created in the inner regions of the two right-angle segments just after turning due to the inertial force therein, yielding complicated distributions of the current and electric potential, and found are the diverging and converging of the velocity component parallel to the magnetic field when fluids are turning. The results show that the pressure drop is in close relationship with the conductance ratio and the length of the connecting channel. The characteristics of the fluid velocity, current, electric potential and pressure gradient of LM MHD flows in a u-shaped duct are examined in detail.</P>
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Yang, Shangjing,Kim, Chang Nyung Elsevier 2017 Fusion engineering and design Vol.122 No.-
<P><B>Abstract</B></P> <P>This numerical study analyzes the characterisitics of three-dimensional liquid metal (LM) magnetohydrodynamic (MHD) flows, with combined internal heat generation and wall heat transfer, in a manifold under a uniform magnetic field by using commercial code CFX. The current study investigates the effect of the distribution of the electric conductivitity of the duct walls on the flow imbalance among the sub-channels in the manifold system made up of three sub-channels. In the manifold, the uniform heat generation in the fluid stream and the uniform heat flux on one side wall (parallel to the magnetic field) are applied. Here, the mechanism causing the imbalance in mass flow rate (and in energy flow rate) is clearly discussed. In the fluid region surrounded by the walls with lower electric conductivity, a large electric potential difference and higher velocity are obtained, causing a high mass flow rate and energy flow rate therein, allowing an effective cooling in regions with higher heat load in the blanket. In addition, the interdependency of the current, electric potential, velocity, pressure gradient and temperature of LM MHD flows in the manifold is described in detail.</P>
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Xuejiao Xiao,Shangjing Yang,김창녕 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.9
In this study, numerically analyzed is the effect of the orientation of the applied transverse magnetic field on the mass-imbalance of MHD flows in a multi-channel conduit consisting of three parallel channels with spatially non-uniform electric conductivity, by using CFX. In the multi-channel conduit, co-flows are driven by the constant pressure gradient in the three channels so that the mass-imbalance among the three channels may be observed in the above situations. Here, the mechanism leading to the mass flow imbalance caused by the orientation of magnetic field and by the spatial difference in the electric conductivity is discussed specifically. The results show that when the channels have spatially different electric conductivity the mass flow imbalance becomes more significant with an increasing of the angle of the applied magnetic field with respect to the plane parallel to the three channels (α).
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Three-dimensional features of MHD flows turning in a right-angle duct
Yue Yan,Shangjing Yang,Chang Nyung Kim 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.12
This study presents a numerical simulation of three-dimensional (3D) Liquid metal (LM) Magnetohydrodynamic (MHD) flows turning in a right-angle duct with a square cross section under a uniform magnetic field applied perpendicular to the plane of the main flow. The 3D features of the flow in a fluid region adjacent to the duct walls of the turning segment are investigated. Cases with different Hartmann numbers and conductance parameters are analyzed using the CFX code. The MHD features of the LM flow are examined in terms of fluid velocity, current density, electric potential, and pressure gradient. The formation of a velocity recirculation is observed in the inner region of the right-angle segment immediately after the turning of the flow because of the inertial force therein, thereby yielding a region of low electric potential with a complicated current distribution. In particular, in the right-angle segment, the axial velocity in the side layer near the outer wall (that is, in the outer side layer) is relatively lower than that in the inflow and outflow channels. In addition, the velocity recirculation region in the right-angle segment decreases and the pressure gradient increases with an increase in conductance parameter.
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