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ELSEVIER Journal of Nuclear Materials 212-215 (1994)885-890 Effect of external pressure on particle bed effective

Summary: ELSEVIER Journal of Nuclear Materials 212-215 (1994)885-890
Effect of external pressure on particle bed effective
thermal conductivity
Fatollah Tehranian, Mohamed A. Abdou, Mark S. Tillack
Mechanical, Aerospace and Nuclear Engineering Department, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles,
CA 90024, USA
Accurate prediction of the thermomechanical responses of particle beds in fusion blankets depends strongly on
the availability of experimental data on their thermal properties as a function of the blanket operating conditions. In
this study, a series of experiments was conducted to measure the effective conductivity and interface conductance of
singe-size aluminum, beryllium and lithium zirconate particle beds as a function of applied external load in the range
O-l.6 MPa. Experiments were carried out with both helium and air as wver gas over a range of pressure 30-760
Torr. In both aluminum and beryllium beds, as the applied load was increased to 1.5 MPa, the effective thermal
conductivity increased by a factor of N 3-7 in an air cover gas, and a factor of u 2-3 in helium. With 1.2 mm
lithium zirconate particles and air as the cover gas, changes in the bed thermal conductivity when the applied load
was varied in the range of O-l.6 MPa were small and within the experimental error. The increase in the interface
conductance values with applied external load shows variatic& similar to those of the thermal conductivity.
1. Introduction
Particle beds have been considered as an alternative
to liquid metals and solid blocks for use as breeder and


Source: Abdou, Mohamed - Fusion Science and Technology Center, University of California at Los Angeles


Collections: Plasma Physics and Fusion