Heat-transfer characteristics of flowing and stationary particle-bed-type fusion-reactor blankets Page: 22 of 282
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coefficient obtained (- 2000 W/m2K). The first wall can therefore
be operated at temperatures significantly lower than the blanket
breeder and coolant; this is important from a radiation damage
viewpoint. Meanwhile, the temperature of the coolant is chosen on
the basis of power cycle efficiency requirements. Such gravity-
flowing particle bed systems have generally not been discussed in
the literature.
1.2 Research Program Objectives
As will be discussed in the next few chapters, the heat transfer
data required for the design of the two types of particle bed
blankets presented in the previous section are not available in the
literature. Thus. this experimental investigation has been
undertaken to examine the heat transfer characteristics of
stationary and flowing particle bed type fusion reactor blankets.
All of the predictive models and many of the experiments which
have been presented for stationary packed beds correlate only the
contributions to heat transfer when the gas in the voids is
stationary. The turbulent contribution to heat transfer due to gas
flow is then left to be determined by experiment; most of these
experiments utilize particles larger than the range of interest for
blanket designs such as that for TMR. In all cases, the modified
Reynolds number for each experiment was greater than 10, the upper
limit of the range of interest here.S
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Nietert, R.E. Heat-transfer characteristics of flowing and stationary particle-bed-type fusion-reactor blankets, report, February 1, 1983; [Livermore,] California. (https://digital.library.unt.edu/ark:/67531/metadc1113214/m1/22/: accessed April 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.