Special topics reports for the reference tandem mirror fusion breeder: liquid metal MHD pressure drop effects in the packed bed blanket. Vol. 1

Technical Report · Sat Sep 01 00:00:00 EDT 1984

DOI:https://doi.org/10.2172/6533592· OSTI ID:6533592

McCarville, T J; Berwald, D H; Wong, C P.C.

Magnetohydrodynamic (MHD) effects which result from the use of liquid metal coolants in magnetic fusion reactors include the modification of flow profiles (including the suppression of turbulence) and increases in the primary loop pressure drop and the hydrostatic pressure at the first wall of the blanket. In the reference fission-suppressed tandem mirror fusion breeder design concept, flow profile modification is a relatively minor concern, but the MHD pressure drop in flowing the liquid lithium coolant through an annular packed bed of beryllium/thorium pebbles is directly related to the required first wall structure thickness. As such, it is a major concern which directly impacts fissile breeding efficiency. Consequently, an improved model for the packed bed pressure drop has been developed. By considering spacial averages of electric fields, currents, and fluid flow velocities the general equations have been reduced to simple expressions for the pressure drop. The averaging approach results in expressions for the pressure drop involving a constant which reflects details of the flow around the pebbles. Such details are difficult to assess analytically, and the constant may eventually have to be evaluated by experiment. However, an energy approach has been used in this study to bound the possible values of the constant, and thus the pressure drop. In anticipation that an experimental facility might be established to evaluate the undetermined constant as well as to address other uncertainties, a survey of existing facilities is presented.

• Research Organization: TRW Energy Development Group, Redondo Beach, CA (USA); General Atomics, San Diego, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6533592
• Report Number(s): UCID-20166-Vol.1; ON: DE85002142
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
THERMONUCLEAR REACTOR COOLING SYSTEMS
MAGNETOHYDRODYNAMICS
PRESSURE DROP
BERYLLIUM
BREEDING BLANKETS
HYBRID REACTORS
LIQUID METALS
LITHIUM
PACKED BED
THORIUM
ACTINIDES
ALKALI METALS
ALKALINE EARTH METALS
COOLING SYSTEMS
ELEMENTS
ENERGY SYSTEMS
FLUID MECHANICS
FLUIDS
HYDRODYNAMICS
LIQUIDS
MECHANICS
METALS
REACTOR COMPONENTS
700204* - Fusion Power Plant Technology- Cooling Systems