A model to simulate the behavior of multitubular packed-bed catalytic reactors was recently proposed [Asensio, D. A.; Zambon, M. T.; Mazza, G. D.; Barreto, G. F. Ind. Eng. Chem. Res. 2014, 53, 35873605]. In particular, the model introduces a heat transfer coefficient h(wf) that accounts for an unmixed fluid film on the wall and a coefficient hf between the fluid channels at a distance D-p/2 from the wall. Computational fluid dynamics simulations intended to evaluate these parameters are described. Four regular sphere arrays between parallel planes that provide different combinations of wall and core channel voidages (epsilon(1) and epsilon(c)) were employed. Reynolds and Prandtl numbers ranges were 100 < Re-p < 2000 and 0.4 < Pr < 3.5. Calculated values of h(wf) and h(f) are well correlated with those of epsilon(1), epsilon(c), Re-p, and Pr. Results for epsilon(1) and epsilon(c) values typical of randomly packed beds of low ratio D-t/D-p show good agreement with carefully analyzed data from the literature.