Bifurcation analysis of chemically driven convection

Viljoen, Hendrik J.; Gatica, Jorge E.; Hlaváček, Vladimír

doi:10.1016/0009-2509(90)87037-s

Cited by 44 publications

(24 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Convection in a porous medium in a chemical reactor was studied in [49]. The articles [36], [47], [48] are devoted to convection caused by a concentration gradient in a reacting medium.…”

mentioning

confidence: 99%

Linear stability analysis of reaction fronts in liquids

Garbey¹,

Taik²,

Volpert³

1996

Quart. Appl. Math.

View full text Add to dashboard Cite

show abstract

“…Convection in a porous medium in a chemical reactor was studied in [49]. The articles [36], [47], [48] are devoted to convection caused by a concentration gradient in a reacting medium.…”

mentioning

confidence: 99%

Linear stability analysis of reaction fronts in liquids

Garbey¹,

Taik²,

Volpert³

1996

Quart. Appl. Math.

View full text Add to dashboard Cite

show abstract

“…This situation can occur for frontal polymerization as well as for some other processes, [20]- [21], [23]- [24], [25], [27]. The results of the analysis appear to be essentially different with respect to the case of a solid product.…”

Section: Different Types Of Instabilities Can Interactmentioning

confidence: 77%

Untitled

1998

Quart. Appl. Math.

View full text Add to dashboard Cite

Abstract.We study the influence of natural convection on stability of reaction fronts in liquids. In our previous article [6] we considered the case where the reactants were in a liquid phase and the product of the reaction was solid. In this paper we study the case where both of them are liquid. We carry out a linear stability analysis and show that the results are essentially different compared to the case of a solid product.

show abstract

“…The focus of the gravity-related studies was on intrasample effects [gas-solid reactions, where natural convection affects gas flow in the sample], but the conjugate flow problem [where natural convection outside the sample affects the combustion] has been largely overlooked. The interaction between natural convection and chemical reaction has been extensively studied for porous and homogeneous media [Viljoen and Hlavacek, 1988;Gatica et al, 1989;Viljoen et al, 1989Viljoen et al, , 1990, investigating the influence of natural convection on ignition and induction periods. Matkowsky and coworkers [1997a,b] did a comprehensive study of natural convection in the realm of filtration combustion.…”

Section: S E Whitney H J Viljoenmentioning

confidence: 99%

Natural convection and solid phase combustion

Whitney

Viljoen

2003

Chemical Engineering Communications

View full text Add to dashboard Cite

Self-propagating high-temperature synthesis [SHS] is a combustion process involving two or more solid reactants. The typical SHS configuration consists of a cylindrical preform of mixed powders, placed in an inert gas chamber, and ignited at one end. In past studies, interaction between the solid phase and the ambient gas phase has been limited to heat losses from the solid; the influence of natural convection on the solid phase has never been considered. In this study, computational fluid dynamics [CFD] is used, and it is shown that intense convection flow develops in the proximity of the combustion front. Gas flows adjacent to reacted solid material, heats up, and when it reaches the unreacted solid heat is transferred from the gas to the solid phase, which aids solid phase thermal conduction in preheating the material. The effect is stronger than expected, and it could stabilize the combustion of structured reactants like roll-ups of foils and wires. Combustion parallel and antiparallel to gravity is investigated for different burning velocities. At low propagation velocities, the natural convection cell forms a torus that is seated above the combustion front. At high propagation velocities, the convection flow cannot track the combustion front, and Tollmien-Schlichting waves form. Constant front propagation and planar oscillations of the combustion front lead to increasingly complex flows. Finally, the heat exchange between the gas and solid for constant front propagation is compared to analytical solutions.

show abstract

Bifurcation analysis of chemically driven convection

Cited by 44 publications

References 24 publications

Linear stability analysis of reaction fronts in liquids

Linear stability analysis of reaction fronts in liquids

Untitled

Natural convection and solid phase combustion

Contact Info

Product

Resources

About