Packed bed pressure drop—an extension to higher Reynolds numbers

Tallmadge, John A.

doi:10.1002/aic.690160639

Cited by 137 publications

(42 citation statements)

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“…On the other hand there is considerable evidence that the Ergun equation overpredicts the pressure drop at values of Reynolds numbers above 300 (Dolejš and Machač, 1995;Hicks, 1970;Salatino and Massimilla, 1990;Tallmadge, 1970), with the difference becoming significant within the turbulent flow regime (Reynolds numbers above 900).…”

Section: Other Effectsmentioning

confidence: 95%

Flow through packed bed reactors: 1. Single-phase flow

Nemec

Levec

2005

Chemical Engineering Science

275

122

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Section: Other Effectsmentioning

confidence: 95%

Flow through packed bed reactors: 1. Single-phase flow

Nemec

Levec

2005

Chemical Engineering Science

275

122

View full text Add to dashboard Cite

“…Tallmadge (1970) proposed an extension of Ergun's (1952) equation apposite for estimation of pressure drop under higher Reynolds numbers:…”

Section: Reactor-side Modellingmentioning

confidence: 99%

Operation of an industrial steam reformer under severe condition: A simulation study

2008

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A rigorous two-dimensional model is developed for simulating the operation of a less-investigated type steam reformer having a considerably lower operating Reynolds number, higher tube diameter, and non-availability of extra steam in the feed compared with conventional steam reformers. Simulation results show that reasonable predictions can only be achieved when certain correlations for wall to fluid heat transfer equations are applied. In all cases, strong radial temperature gradients inside the reformer tubes have been found. Furthermore, the results show how a certain catalyst loading profile will affect the operation of the reformer.Un modèle bidimensionnel rigoureux est mis au point pour simuler le fonctionnement d'un reformeurà vapeur d'un type qui aété moinś etudié, ayant un nombre de Reynolds de fonctionnement bas, un diamètre de tubeélevé et une non disponibilité de vapeur excédentaire dans l'alimentation comparativement aux reformeurs de vapeur classiques. Les résultats de simulation montrent que des prédictions raisonnables peuventêtre obtenues seulement lorsque certaines corrélations pour leséquations de transfert de chaleur de la paroi vers le fluide sont appliquées. Dans tous les cas, de forts gradients de température radiaux dans les tubes de reformeur ontété trouvés. En outre, les résultats montrent comment un certain profil de chargement de catalyseur influe le fonctionnement du reformeur.

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“…However, as Jones and Krier (1983) where C 1 and C 2 are constants. Along these lines, Tallmadge (1970) suggests…”

Section: Critique Of Current Orthodoxymentioning

confidence: 99%