La Plata, Argentina
La Plata, Argentina
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Taulamet M.J.,PROIRQ | Taulamet M.J.,CONICET | Mariani N.J.,PROIRQ | Mariani N.J.,CONICET | And 4 more authors.
Reviews in Chemical Engineering | Year: 2015

A critical review of the available information about heat transfer between a packed bed with cocurrent downflow of gas and liquid and an external medium was undertaken. Several aspects such as experimental set-ups and methods employed to study heat transfer in trickle bed reactors, models used to interpret experimental data, and literature correlations of heat transfer parameters are addressed. From the analysis of the available experimental information, a refined database has been built, which allows comparing the performance of the existing correlations for the parameters of the extensively employed two-dimensional pseudohomogeneous plug flow model (i.e., effective radial thermal conductivity and wall heat transfer coefficient). In addition, new correlations for effective thermal conductivity have been developed. Identification of gaps in the current knowledge and recommendations for future works are summarized. © 2015 by De Gruyter.

Zambon M.T.,CONICET | Asensio D.A.,CONICET | Barreto G.F.,PROIRQ | Barreto G.F.,National University of La Plata | Mazza G.D.,CONICET
Industrial and Engineering Chemistry Research | Year: 2014

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, 3587-3605]. In particular, the model introduces a heat transfer coefficient hwf that accounts for an unmixed fluid film on the wall and a coefficient hf between the fluid channels at a distance Dp/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 (ε1 and εc) were employed. Reynolds and Prandtl numbers ranges were 100 < Rep < 2000 and 0.4 < Pr < 3.5. Calculated values of hwf and hf are well correlated with those of ε1, εc, Rep, and Pr. Results for ε1 and εc values typical of randomly packed beds of low ratio Dt/Dp show good agreement with carefully analyzed data from the literature. © 2014 American Chemical Society.

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