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Journal of Materials Processing Technology 181 (2007) 206212 Experimental measurements of the effective thermal conductivity
 

Summary: Journal of Materials Processing Technology 181 (2007) 206212
Experimental measurements of the effective thermal conductivity
of a lithium titanate (Li2TiO3) pebbles-packed bed
Ali Abou-Sena, Alice Ying, Mohamed Abdou
Mechanical and Aerospace Engineering Department, University of California, Los Angeles, CA 90095-1597, USA
Abstract
Tritium breeding materials, which have the ability to react with neutrons and produce tritium, are required to fuel fusion reactions. Tritium is
produced inside the fusion blanket by neutron irradiation of lithium ceramics (tritium breeders). Using the lithium ceramics in form of pebbles-
packed bed is a promising concept for fusion blankets, and worldwide efforts have been dedicated to its R&D. Thermal properties of lithium
ceramic pebble beds have a significant impact upon the thermal performance of the fusion blanket. Specifically, the effective thermal conductivity
of lithium ceramic pebble beds is important for the design and analysis of fusion blankets. The experimental apparatus of this study was designed
and built based on the principles of the steady state and axial heat flow methods in order to conduct the required measurements. The objective of
this study is to measure the effective thermal conductivity of a Li2TiO3 pebble bed as a function of the average bed temperature. The pebble bed
has pebbles of 1.72.0 mm diameter and a packing fraction of 61%. Helium at atmospheric pressure was used as a filling gas. The experimental
results showed that the effective thermal conductivity decreased from 1.40 to 0.94 W/m K with the increase of the average bed temperature from
50 to 500
C. The results presented in this work will help to create a database of the effective thermal conductivity of Li2TiO3 pebble beds which
can be used for the design and analysis of fusion blankets.
2006 Elsevier B.V. All rights reserved.
Keywords: Effective conductivity; Pebble bed; Fusion blanket

  

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

 

Collections: Plasma Physics and Fusion