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Thermal conductivity of mixed beryllia/Li ceramic in sphere-pac forms

Author
Tam, S. W.
Published
United States : [publisher not identified], 1986
Springfield, Va.: National Technical Information Service, [approximately 1986]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Johnson, C. E.

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Summary
Lithium containing ceramic tritium breeder materials have been envisaged to be deployed within the blanket region of a fusion reactor in several possible configurations. One of these is the sphere-pac configuration. For this configuration an important material parameter is its thermal conductivity (Ksp). It is well known that Ksp demonstrates rather complex behavior as a function of temperature, gas pressure, gas composition, particle size, and packing fraction. The inter-relationship of these parameters has been satisfactorily accounted for with a hierarchical effective media theory (HEMT). For tritium self sufficiency most lithium ceramic breeder materials would require the presence of a neutron-multiplier (e.g., Be or BeO). Here, the influence of configuration on Ksp (i.e., how one put the different solid components together in the sphere-pac bed) becomes important. Using a generalized HEMT (i.e., a model with capability to describe systems with more than one solid material component) we have analyzed in detail the configurational dependence of Ksp for sphere-pac beds composed of lithium ceramic/BeO microspheres. Substantial improvements in Ksp can be achieved if a configuration of lithium ceramic spheres coated with BeO is chosen.
Report Numbers
DE86010521; CONF-860421-45
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: W-31-109-ENG-38
OSTI Identifier 5919062
Research organization: Argonne National Lab., IL (USA).
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