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World Journal of Engineering
Research and Technology

( An ISO 9001:2015 Certified International Journal )

An International Peer Reviewed Journal for Engineering Research and Technology

ISSN 2454-695X

Impact Factor : 5.924

ICV : 79.45

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Abstract

MODELLING HYDROTHERMAL SYNTHESIS OF OXIDE MATERIALS IN AUTOCLAVE REACTORS WITH CONSIDERING NATURAL CONVECTION

F. I. Sharikov and I. V. Sharikov*

ABSTRACT

Hydrothermal synthesis is widely used for the production of various nanodispersed oxide materials. Reactions under hydrothermal conditions are complicated and usually they are accompanied with heat generation or heat absorption. Heat flux calorimetry is a powerful instrument for kinetic study and developing mathematical models of hydrothermal reactions. In order to apply the kinetic data to reactors of larger volume one should take into account heat transfer, mass transfer phenomena and the possibility of non-uniform temperature distribution in a definite apparatus at the chosen initial conditions in course of hydrothermal synthesis. To predict the reaction course in a larger apparatus a mathematical model of the hydrothermal process has been developed. It takes into account natural convection inside a hydrothermal reactor together with the chemical reaction. Convective flows can be described at the base of Bussinesque approach. The differential equations system may be solved with applying a dedicated ConvEx program package that takes into account size and geometry of the reactor, reaction mixture properties, heat transfer peculiarities inside and outside and heat generation due to chemical reaction.

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