Abstract
ABSTRACT This paper presents a numerical analysis of entropy generation in a two-dimensional rectangular channel where the inlet flow undergoes thermal decomposition resulting from a chemical reaction. The model considered viscosity and thermal conductivity to be dependent of temperature. Irreversibility due to mass transport was included in the entropy generation analysis. Relevant applications of this study are possible for the design of power generation systems and reactors. The effects of the Reynolds number, Schmidt number, and length of the heat source on thermal fluid dynamics, mass transfer, and irreversibility were also investigated. It was found that thermal decomposition increases at: a) low Reynolds numbers, b) low Schmidt numbers, and c) increased length of heat source. Additionally, overall entropy generation increased when Reynolds number and length of heat source were increased, although in all cases, overall irreversibility attains a minimum value at a specific Schmidt number.
Highlights
Over the past decades, flow simulations in open systems have received considerable attention due to their relevance for a number of engineering, industrial, and natural applications; there is a lack of research related to hydrodynamics and entropy generation in systems where chemical reactions take place in the fluid
The main objective of the present study is to analyze the effects of Reynolds number, Schmidt number, and length of the heat source on the generation of entropy in flow inside an open rectangular system due to thermal decomposition driven by a chemical reaction
This paper presents a two-dimensional steadystate numerical study of the entropy generated by fluid friction, heat transfer, and mass transfer in a ventilated cavity with thermal decomposition driven by a chemical reaction
Summary
Flow simulations in open systems have received considerable attention due to their relevance for a number of engineering, industrial, and natural applications; there is a lack of research related to hydrodynamics and entropy generation in systems where chemical reactions take place in the fluid. Harfash and Alshara (2015) analyzed the effect of chemical reactions on a double diffusive convection model in a porous cavity, and presented the stability analysis and numerical simulations of the convective motion of an incompressible fluid. Luo et al (2004) discussed the results of computations aimed toward an acceptable scaled-up version of an impinging jet chemical reactor modeled as an open cavity. They were successful in determining geometry and a range of appropriate flow parameters by Guillermo E.
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