Modeling of reaction‐induced flow maldistributions in packed beds

Stroh, Friedemann; Balakotaiah, Vemuri

doi:10.1002/aic.690370709

Cited by 19 publications

(6 citation statements)

References 33 publications

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“…Schmitz and Tsotsis [12] showed in their theoretical study that inter-particle interactions give rise to spatially patterned states under certain conditions. Balakotaiah and coworkers [13][14][15] have shown that flow misdistributions and hot spots may occur in down-flow packed-bed reactors and the regions of these instabilities are determined in terms of various transport and kinetic parameters. Benneker et al [16] indicated that hydrodynamic instabilities observed in packed-bed reactors may disturb the plug-flow character and may lead to hot spots and deactivated catalysts.…”

Section: Introductionmentioning

confidence: 99%

Linear stability analysis of high- and low-dimensional models for describing mixing-limited pattern formation in homogeneous autocatalytic reactors

Gupta

Chakraborty

2009

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Linear stability analysis of high- and low-dimensional models for describing mixing-limited pattern formation in homogeneous autocatalytic reactors

Gupta

Chakraborty

2009

Chemical Engineering Journal

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“…Significant modeling effort has been directed to predict the formation of transversal (normal to the flow direction) hot zones in packed‐bed reactors. Balakotaiah's research group16, 17 showed that when the flow rate is very low, convective instabilities may generate flow maldistribution, and hot zones in packed bed reactors. Similar predictions were made by Benneker et al18 Balakotaiah et al19, 20 showed that stationary transversal hot zones may form in an adiabatic packed bed reactor when the transversal effective heat conduction was lower than that of the species dispersion.…”

Section: Introductionmentioning

confidence: 99%

Reactor diameter impact on hot zone dynamics in an adiabatic packed bed reactor

2007

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in Wiley InterScience (www.interscience.wiley.com).Recent analysis revealed that a pseudohomogeneous model of a uniformly active, adiabatic packed bed reactor can predict formation of stable hot zones in the crosssection of the reactor if the kinetic rate expression can lead to isothermal rate oscillations. This prediction was confirmed by simulations of CO oxidation. We show that hot zone formation in a shallow reactor can be predicted also for C 2 H 4 hydrogenation, the kinetic model of which is structurally different from that of CO oxidation. Qualitatively different spatiotemporal temperature patterns may form under the same operating conditions. Their number increases as the reactor diameter is increased. An increase in the reactor diameter increases the time constant of the transversal heat dispersion and decreases the temperature synchronization among points on the same reactor crosssection. The interaction and conjugation among qualitatively different moving temperature patterns can lead to formation of complex motions.

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“…Viljoen et al10 pointed out that an exothermic chemical reaction may generate various convection and temperature patterns in a porous media. Stroh and Balakotaiah,11 Nguyen and Balakotaiah,12, 13 and Subramanian and Balakotaiah14 all showed that spatiotemporal flow and temperature patterns may evolve in packed‐bed reactors, when the feed flow rate is rather low. Schmitz and Tsotsis15 found that stationary patterns can form in a chain of interacting catalysts (cell model) only when the rate of species exchange exceeded that of heat exchange.…”

Section: Introductionmentioning

confidence: 99%