1972
DOI: 10.1002/aic.690180225
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Prediction of breakthrough curves in packed beds: I. Applicability of single parameter models

Abstract: Applicability of Single Parameter ModelsConditions under which simplified, single parameter models may be used to predict breakthrough curves in linear, packed bed adsorbers and thermal regenerators are examined with reference, in particular, to earlier conditions proposed by Handley and Heggs and by Babcock and co-workers. I t is found that for high values of heat capacity ratio the Schumann model provides a satisfactory description of packed bed dynamics where fluids axial dispersion and solids conduction ef… Show more

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Cited by 87 publications
(15 citation statements)
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“…Therefore, the augmented-NTU, referred to as NTU Ã , associated with U = 0.3, R = 0.5, and NTU = 40 is 90.5. This approach is analogous to the idea of using a pseudo-Stanton number or apparent heat transfer coefficient to account for particle internal conductivity or axial dispersion, as described by Jeffreson [12]. Notice that the range of NTU shown in Fig.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Therefore, the augmented-NTU, referred to as NTU Ã , associated with U = 0.3, R = 0.5, and NTU = 40 is 90.5. This approach is analogous to the idea of using a pseudo-Stanton number or apparent heat transfer coefficient to account for particle internal conductivity or axial dispersion, as described by Jeffreson [12]. Notice that the range of NTU shown in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…Using the augmented-NTU in place of the actual NTU allows computationally simpler models that neglect the effect of entrained fluid to provide estimates of regenerator performance that account for this effect. The augmented-NTU approach can be used in conjunction with other correction factors such as those proposed by Jeffreson to account for temperature gradients that are internal to the regenerator matrix and axial dispersion [12].…”
Section: Introductionmentioning
confidence: 99%
“…It is known (Incropera, 2002) that when the Biot number of the heat transfer of a particle is larger than 0.1, the lumped capacitance assumption will result in increased inaccuracy. In order to correct the lumped capacitance approximation for a spherical 'particle' in fluid, Bradshaw et al (Bradshaw et al, 1970) and Jeffreson (Jeffreson, 1972) proposed to correct the convective heat transfer coefficient between the solid spherical 'particle' and the fluid. The modified heat transfer coefficient is then used in the equations for the transient temperature in the 'particle' from the standard lumped capacitance method.…”
Section: Modification Of Lumped Capacitance Methodsmentioning
confidence: 99%
“…Following from Jeffreson (1972), the isothermal particle assumption can be relaxed by modifying the inter-phase heat transfer coefficient according to…”
Section: Constitutive Equationsmentioning
confidence: 99%