Liquid-metal MHD flow in a duct whose cross section changes from a rectangle to a trapezoid, with applications in fusion blanket designs

Technical Report · Tue Apr 01 00:00:00 EST 1986

DOI:https://doi.org/10.2172/5409989· OSTI ID:5409989

Walker, J S

This paper treats the liquid-metal MHD flow in a semi-infinite rectangular duct and a semi-infinite trapezoidal duct, which are connected by a finite-length transition duct. There is a strong, transverse, uniform magnetic field. The walls parallel to the magnetic field (sides) remain parallel, while the walls intersecting the magnetic field are twisted in the transition duct to provide the change in cross sectional shape. The left side has a constant height, while the height of the right side increases or decreases in the transition duct. This geometry gives a skewed velocity profile with a high velocity near the left side, provided the right side is relatively thick. All walls are thin and electrically conducting, but the sides are considerably thicker than the other walls. The application is to fusion-reactor blankets in which a high velocity near the first wall (separating the plasma chamber from the coolant) improves the thermal performance. Junctions of different ducts with walls parallel to the magnetic field are treated for the first time. In expansions, contractions and other geometric transition ducts, as well as in straight ducts with axially varying magnetic fields, the fluid flow and electric currents are concentrated in boundary layers adjacent to the sides and in the side. At a junction with a straight duct with a uniform magnetic field, the flow and current must transfer from the boundary layers adn sides to the core regions. These transfers at junctions play a key role in any three-dimensional flow.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States); Illinois Univ., Urbana (USA). Dept. of Theoretical and Applied Mechanics
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 5409989
• Report Number(s): ANL/FPP/TM-206; ON: DE86015005
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BREEDING BLANKETS
MAGNETOHYDRODYNAMICS
DUCTS
LIQUID FLOW
THERMONUCLEAR REACTOR COOLING SYSTEMS
BOUNDARY LAYERS
COOLING SYSTEMS
LIQUID METALS
VELOCITY
ELEMENTS
ENERGY SYSTEMS
FLUID FLOW
FLUID MECHANICS
FLUIDS
HYDRODYNAMICS
LAYERS
LIQUIDS
MECHANICS
METALS
REACTOR COMPONENTS
700204* - Fusion Power Plant Technology- Cooling Systems