Magnetohydrodynamic flows in a dis-aligned duct system under a uniform magnetic field
In the present study, three-dimensional Magnetohydrodynamic (MHD) Liquid-metal (LM) flows in a dis-aligned duct system under a uniform magnetic field are investigated by numerical method. Computational fluid dynamics (CFD) simulations are carried out to analyzed the characteristics of the MHD flows and to examine the inter-relationship of the LM velocity, current density, electric potential and pressure, using CFX. The duct system consists of two dis-aligned parallel channels (One inflow channel and one outflow channel) and one channel connecting the above channels. In the present study, cases with different lengths of the connecting channel are considered. Because of the inertial force therein, a velocity recirculation is found in the region just after the first turning, resulting in a region of peak value in electric potential together with complex distribution of the current. Also, another velocity recirculation is seen in the region just after the second turning, creating another region of peak value in electric potential. In a situation where the magnetic field is applied in a direction perpendicular to the plane of the main flow in a dis-aligned duct system, until the fluid reaches an edge, the velocity component parallel to the magnetic field converges, with an increasing in the peak value of the side layer velocity, and then, after the fluid passes the edge, the velocity component parallel to the magnetic field diverges, with a decrease in the peak value of the side layer velocity. Oppositely, until the fluid reaches a corner, the velocity component parallel to the magnetic field diverges, with a decrease in the peak value of the side layer velocity, and then, after the fluid passes the corner, the velocity component parallel to the magnetic field converges, with an increase in the peak value of the side layer velocity. It is found that this type of velocity pattern is closely associated with the current distribution in the region of right-angle segments in the sense that the magnitude of the electromotive component of electric current is proportional to the fluid velocity.
KeywordsCFX Dis-aligned duct LM MHD flows Recirculation Right-angle segment
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- S. Smolentsev, N. B. Morley, M. Abdou, R. Munipalli and R. Moreau, Current approaches to modeling MHD flows in the dual coolant lead lithium blanket, Magnetohydrodynamics, 42 (2–3) (2006) 225–236.Google Scholar
- S. Horanyi, L. Buhler and E. Arbogast, Experiments on magnetohydrodynamic flows in a sudden expansion of rectangular ducts at high Hartmann number, The 15th RIGA and 6th PAMIR Conference on Fundamental and Applied MHD (2005) 243–246.Google Scholar
- S. Molokov, Liquid metal flows in manifolds and expansions of insulating rectangular ducts in the plane perpendicular to a strong magnetic field, KfK 5272, Kernforschungszentrum Karlsruhe (1994).Google Scholar
- P. K. Swain, P. Satyamurthy, R. Bhattacharyay, A. Patel, A. Shishko, E. Platacis, A. Ziks, S. Ivanov and A. V. Despande, 3D MHD lead-lithium liquid metal flow analysis and experiments in a Test-Section of multiple rectangular bends at moderate to high Hartmann numbers, Fusion Engineering and Design, 88 (2013) 2848–2859.CrossRefGoogle Scholar
- C. Mistrangelo and L. Buhler, Three-dimensional magnetohydrodynamic flows in sudden expansions, The 15th RIGA and 6th PAMIR Conference on Fundamental and Applied MHD (2005) 239–242.Google Scholar
- I. D. Piazza and L. Buhler, Numerical simulations of buoyant magnetohydrodynamic flows using the CFX code, Forschungszentrum Karlsruhe Technic und Umwelt, Wissenschaftliche Berichte FZKA6354, Forschungszentrum Karlsruhe, GmbH (1999).Google Scholar
- C. Mistrangelo and L. Buhler, Numerical investigation of liquid metal flows in rectangular sudden expansions, Fusion Engineering and Design (2007) 2176–2182.Google Scholar
- W. M. Stacey, Fusion, John and Wiley & Sons, USA (1984).Google Scholar
- M. Raw, Robustness of coupled algebraic multigrid for the Navier-Stokes equations, A9618260, AIAA Meeting Paper 96-0297 (1996).Google Scholar
- C. Mistrangelo, Three-dimensional MHD flow in sudden expansions, Forschungszentrum Karlsruhe, FZKA 7201.Google Scholar