6.2 Size Effects
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Fig. 6.9 Numerical transient results of the two-region pebble bed, a, b, and c for Case 1 (R L = 3.0,
R D = 1.0), d, e, and f for Case 3 (R L = 3.0, R D = 2.0), g, h, and i for Case 4 (R L = 3.0, R D = 0.5).
a t = 3s, f = 0.38; b t = 50 s, f = 0.31; c t = 150 s, f = 0.28; d t = 3s, f = 0.070; e t = 20s, f =
0.049; f t = 150 s, f = 0.039; g t = 4s, f = 0.83; h t = 150 s, f = 0.82; i t = 280 s, f = 0.76