scholarly journals Swirling to improve heat transfer in the MHD flow of liquid metal in a duct

2021 ◽  
Vol 2088 (1) ◽  
pp. 012007
Author(s):  
D Yu Chernysh ◽  
D Krasnov ◽  
Yu B Kolesnikov ◽  
I A Belyaev
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Rectangular Channel ◽  
Mhd Flow ◽  
Flow Region ◽  
Point Of View ◽  
Initial Flow ◽  
Significant Length ◽  
Improve Heat Transfer ◽  
First Time

Abstract The subject of this study is the effect of the initial “swirling” of the flow by installing cylindrical elements in the initial flow region affected by strong magnetic field. In particular, various designs (longitudinal, transverse, and inclined arrangement with respect to the magnetic field) and the dimensions of the cylinders are considered. To create liquid metal systems that are more predictable and possibly more efficient from the point of view of thermal hydraulics, we experimentally studied the flow in a rectangular channel with dimensions of 56×16 mm. For the first time, it was found that the presence of an initial flow disturbance leads to significant changes in the flow at a significant length (700 mm).

Three-Dimensional Numerical Analyses on Liquid-Metal Magnetohydrodynamic Flow in Magnetic-Field Inlet-Region

2002 ◽  
Author(s):  
Hiroshige Kumamaru
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Rectangular Channel ◽  
Three Dimensional ◽  
Sharp Decrease ◽  
Mhd Flow ◽  
Momentum Equation ◽  
Parabolic Profile ◽  
Inlet Region ◽  
Flat Profile

Three-dimensional numerical calculations have been performed on liquid-metal magnetohydrodynamic (MHD) flow through a rectangular channel in the inlet region of the magnetic field, including a region upstream the applied magnetic field section. The continuity equation, the momentum equation and the induction equation have been solved numerically by the finite difference method. Along the flow axis (i.e. the channel axis), the pressure decreases slightly as normal non-MHD flow, increases once, thereafter decreases sharply and finally decreases gradually as fully-developed MHD flow. The sharp decrease in the pressure in the inlet region is due to increase in the induced electric current in this region comparing with that in the fully-developed region. The flow velocity distribution also changes gradually from a parabolic profile of a laminar flow to a flat profile of a fully-developed MHD flow.

Hydrodynamics and heat transfer for downward liquid metal flow in a rectangular channel in the presence of a coplanar magnetic field

2016 ◽  
Vol 52 (1) ◽  
pp. 155-162
Author(s):  
N. Yu. Pyatnitskaya ◽  
◽  
E. V. Sviridov ◽  
N. G. Razuvanov ◽  
◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Liquid Metal ◽  
Rectangular Channel ◽  
Metal Flow ◽  
Liquid Metal Flow

Magnetohydrodynamic liquid‐metal flows in a rectangular channel with an axial magnetic field, a moving conducting wall and free surfaces

1990 ◽  
Vol 68 (9) ◽  
pp. 4446-4460 ◽  
Author(s):  
Gita Talmage ◽  
John S. Walker ◽  
Samuel H. Brown ◽  
Neal A. Sondergaard ◽  
Patricia E. Burt
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Axial Magnetic Field ◽  
Rectangular Channel ◽  
Free Surfaces ◽  
Conducting Wall

Numerical simulation of liquid-metal MHD flows in rectangular ducts

1990 ◽  
Vol 216 ◽  
pp. 161-191 ◽  
Author(s):  
A. Sterl
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Boundary Layers ◽  
Hartmann Number ◽  
Three Dimensional ◽  
Mhd Flow ◽  
Two Dimensional ◽  
Square Duct ◽  
Mhd Flows ◽  
Pressure Losses

To design self-cooled liquid metal blankets for fusion reactors, one must know about the behaviour of MHD flows at high Hartmann numbers. In this work, finite difference codes are used to investigate the influence of Hartmann number M, interaction parameter N, wall conductance ratio c, and changing magnetic field, respectively, on the flow.As liquid-metal MHD flows are characterized by thin boundary layers, resolution of these layers is the limiting issue. Hartmann numbers up to 103 are reached in the two-dimensional case of fully developed flow, while in three-dimensional flows the limit is 102. However, the calculations reveal the main features of MHD flows at large M. They are governed by electric currents induced in the fluid. Knowing the paths of these currents makes it possible to predict the flow structure.Results are shown for two-dimensional flows in a square duct at different Hartmann numbers and wall conductivities. While the Hartmann number governs the thickness of the boundary layers, the wall conductivities are responsible for the pressure losses and the structure of the flows. The most distinct feature is the side layers where the velocities can exceed those at the centre by orders of magnitude.The three-dimensional results are also for a square duct. The main interest here is to investigate the redistribution of the fluid in a region where the magnetic field changes. Large axial currents are induced leading to the ‘M-shaped’ velocity profiles characteristic of MHD flow. So-called Flow Channel Inserts (FCI), of great interest in blanket design, are investigated. They serve to decouple the load carrying wall from the currents in the fluid. The calculations show that the FCI is indeed a suitable measure to reduce the pressure losses in the blanket.

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