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• W4213296778 endingPage "122699" @default.
• W4213296778 startingPage "122699" @default.
• W4213296778 abstract "• Propose the concept of irreversibility indicator for transport processes. • Entropy generation cannot measure irreversibility of standalone transport processes. • Entropy generation-based optimization may deteriorate process performance instead. • Irreversibility of a transport process should be measured by its energy dissipation. The entropy generation has been widely used for evaluating irreversibility of transport processes and optimize their performance. However, there still exist challenges against this methodology. This work revisits the irreversibility evaluation in typical transport processes. The irreversibility indicator of transport processes is proposed combining aspects of physical essence and practical application. It is expected to be able to recover the constitutive relation, characterize the evolution direction of process, and optimize standalone transport processes. The entropy generation rate is examined against these conditions, and results show that it fails to meet them. These failures challenge the legitimacy of entropy generation rate in characterizing transport processes’ irreversibility. In contrast, the irreversibility of heat, mass, and momentum diffusion processes can be measured by the entransy dissipation, mass entransy dissipation, and momentum entransy dissipation, respectively. A one-dimensional “volume-to-point” heat conduction and a mass diffusion optimization problem are numerically studied, respectively. Results show that the entransy dissipation-based optimization reduces the average temperature by 3–5 K, giving a better performance than entropy generation optimization, which increases the average temperature up to 17.55 K. In the mass diffusion problem, the mass entransy dissipation-based optimization reduces the average concentration by 3.67%, showing a much better performance than the entropy generation optimization, which yields a 26% increase. Finally, these irreversibility indicators are found to be equivalent to their corresponding energy dissipations." @default.
• W4213296778 created "2022-02-24" @default.
• W4213296778 creator A5007992168 @default.
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• W4213296778 date "2022-06-01" @default.
• W4213296778 modified "2023-09-30" @default.
• W4213296778 title "Irreversibility evaluation for transport processes revisited" @default.
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• W4213296778 doi "https://doi.org/10.1016/j.ijheatmasstransfer.2022.122699" @default.
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