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Wrong‐way behavior of packed‐bed reactors: Influence of interphase transport
Author(s) -
Chen Y. C.,
Luss Dan
Publication year - 1989
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690350710
Subject(s) - dimensionless quantity , packed bed , mechanics , interphase , steady state (chemistry) , transient (computer programming) , thermodynamics , heat transfer , materials science , dispersion (optics) , ignition system , phase (matter) , chemistry , physics , chromatography , optics , computer science , genetics , operating system , organic chemistry , biology
Large transient temperature excursions may be caused by a sudden reduction in the feed temperature to a packed‐bed reactor operating at an intermediate conversion. When a unique steady state exists for all feed temperatures, the magnitude of the wrong‐way behavior predicted by a two‐phase model is very close to that predicted by a pseudohomogeneous model if Pe H is equal to the dimensionless heat transfer coefficient H . The two‐phase model enables a more efficient numerical simulation in such cases. The predictions of these two models may be rather different when steady‐state multiplicity exists for some feed temperatures. In such cases, a two‐phase model, which accounts for the axial dispersion of heat, should be used to simulate the transient behavior. The wrong‐way behavior may lead to an ignition of a low‐temperature state or an upstream propagation of a transient temperature wave.