Heat-transfer characteristics of flowing and stationary particle-bed-type fusion-reactor blankets Page: 72 of 282
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55
(4/6)DtE
tI(- E)(Dt/dp) + 1 (2.4-3)
The values of k0eZ/k and c3 obtained are presented in Table 2.4-4.
Gunn and Khalid (1975) presented an elaborate mathematical
treatment of the pseudohomogeneous problem incorporating three
parameters. A solution similar to that presented by Coberly and
Marshall for the two-parameter method was presented. A minimization
technique similar to that used by DeWasch and Froment was used in
obtaining the values of ker, kez, and hw. Results for the modified
Reynolds number in excess of 40 were then compared to the literature.
ker obtained in this fashion were in good agreement with previous
authors. The wall coefficient was also found to be in agreement
with some of the literature. Disagreement with the balance was
probably not due to the different method used (i.e. three parameters
instead of two), but due to disagreement in the literature to date
among those utilizing the two-parameter method.
Specchia, Baldi, and Sicardi (1980) quoted the work of Dixon,
Cresswell, and Paterson (1978) on axial effective conductivity.
These authors found that accounting for a separate kez independent
of ker was only important for shallow beds and at low fluid velocity.
When studying beds of ceramic beads and steel spheres with Dt/dp
between 5.6 and 11.2, L/dp greater than 10 or 15, and NRe between
70 and 380, the temperature profiles calculated with the two- and
three-parameter methods were found to be nearly identical.
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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/m1/72/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.