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  • 1
    Electronic Resource
    Electronic Resource
    Influence of secondary flows on the stability of chemically reacting systems (1988)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 34 (1988), S. 209-222 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A model is presented for convection and chemical reacton in porous media. An irreversible chemical reaction of arbitrary order is considered. Reactant depletion allows for basic solutions in either the kinetic or the diffusion regime. The cases of forced flow parallel to the lateral walls of the cavity and a closed system are addressed. A linear stability analysis of the basic states is performed and critical values of the thermal Rayleigh number for the onset of natural convection are determined. A dispersion relation is derived and a graphical representation of the linear stability analysis results is provided for typical values of the system parameters. Analytical predictions are verified by results obtained by numerical integration of the complete set of nonlinear partial differential equations. The effect of natural convection is discussed when the basic state is either in the kinetic or in the diffusion regime. For large gradients, associated with the diffusion regime, chemical reaction can drive free convection even for low values of the Rayleigh number. In forced flow systems, natural convection can change substantially the flow pattern of the system.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690340205
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reaction front propagation in nonadiabatic exothermic reaction flow systems (1987)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 819-833 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A general analysis of the reaction wave propagation in nonlinear exothermic nonadiabatic diffusion-convection-reaction systems is presented. The following topics are considered: approximation of temperature profiles based on the idea of infinitesimaly thin reaction front, estimation of maximum temperature, estimation of the conversion at the hot spot, a priori calculation of the front velocity, analysis of the self-ignition phenomena and their relation to wave propagation, and discussion of the effect of the heat loss parameter on the direction of propagation and shape of traveling waves. A comparison of the analytical work with exact numerical results reveals excellent agreement. The main objective of this paper is to provide a definite analysis of reaction wave propagation in reacting flow systems.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690330515
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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