Comments on discrimination of three approaches to evaluate heat fluxes for wall-cooled fixed bed chemical reactors

Westerterp, K.R.; Jong, Wiebren de; Benthem, G.H.W. van

doi:10.1016/0009-2509(93)80276-v

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Using the Linear Extrapolation 3 And Accounting For Mass Tra1

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1994

1996

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“…measured temperature was about 670 K). Other data in the same paper lead to much higher values of c", so these data should have been interpreted with a heterogeneous model; see also Westerterp et al (1993).…”

Section: Using the Linear Extrapolation 3 And Accounting For Mass Tramentioning

confidence: 79%

A more strict criterion for application of homogeneous models in modelling wall-cooled packed-bed reactors

Westerterp

Jong

Benthem

1994

Chemical Engineering Science

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Recently, Wijngaarden and Westerterp (1989) derived a dimensionless criterion as to whether or not a homogeneous model can be used instead of a heterogeneous one in modelling wall-cooled tubular reactors. Their work is an extension of the well-known criteria of e.g. Mears (1971) for the neglect of interparticle mass and heat transfer resistances. Important, but somewhat restrictive, assumptions in their article are the linearization of the reaction rate with respect to the coolant temperature and the neglect of an external mass @an&r limitation between the catalyst pellets and the gas phase. In this short communication we will demonstrate that simple extensions of their criterion, considerably enlarging its applicability, can be derived. Wijngaarden and Westerterp introduced a dimensionless number c:

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Section: Using the Linear Extrapolation 3 And Accounting For Mass Tramentioning

confidence: 79%