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Fusion Engineering and Design 17 (1991) 165-170 165 North-Holland

Summary: Fusion Engineering and Design 17 (1991) 165-170 165
Experimental studies of active temperature control in solid
breeder blankets
M.S. Tillack, A.R. Raffray, A.Y. Ying, M.A. Abdou and P.E. Huemer
Mechanical, Aerospace, and Nuclear Engineering Department, University of California Los Angeles, Los Angeles, CA 90066, USA
A program of model development and experimentation has been undertaken to develop innovative methods to provide
predictable and controllable thermal barrier regions for solid breeder blankets. In particular, particle beds have been studied
because of their unique thermalhydraulic properties. It has been demonstrated that large variations in thermal conductance
can be obtained in the thermal barrier region by external control over the gas pressure and composition in a metallic particle
bed. By providing this "active " control mechanism, adjustments in the blanket temperature profiles canbe made during
operation to accommodate changes in power levels, time-dependent changes in material behavior, and design uncertainties.
Data are presented for the effective thermal conductivity of several single-size and binary beds of aluminum, for a range of He
and N2 gas pressures, and for a number of different porosities. Data for the wall conductance also are presented. The relative
contribution to the temperature drop due to wall conductance is smallest in single-size beds with smaller particles. The
variation of wall conductance with pressure is small or non-existent suggesting that the wall region is dominated by
conduction through the solid particle contact points, rather than gas in the Smolukovski zones.
I. Introduction
One of the largest remaining uncertainties in the
operation of solid breeder blankets is thermomechanical


Source: Abdou, Mohamed - Fusion Science and Technology Center, University of California at Los Angeles
Raffray, A. René - Center for Energy Research, University of California at San Diego


Collections: Plasma Physics and Fusion