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Out-of-Equilibrium Thermodynamics
Published in Pier Luigi Gentili, Untangling Complex Systems, 2018
It is evident that the entropy production corresponds to the product between two distinct terms: (1) the flow of heat, which is the rate of the irreversible process; and (2) (1/TA − 1/TB), which is the cause, or the “force” of the irreversible process since its sign rules the direction of the flow.
Reversibility and Work
Published in W. Li Kam, Applied Thermodynamics: Availability Method And Energy Conversion, 2018
where the equality holds for reversible processes and the inequality for irreversible processes. This equation frequently is referred to as the principle of entropy production. The rate of entropy production is used to indicate the quality of a design or the performance of a system operation. When the rate of entropy production is reduced, an improvement in design or system performance has been achieved. At the limit, when the system undergoes an ideal process, the rate of entropy production is expected to be zero.
Foundations of Heat Transfer
Published in Sadik Kakaç, Yaman Yener, Anchasa Pramuanjaroenkij, Convective Heat Transfer, 2013
Sadik Kakaç, Yaman Yener, Anchasa Pramuanjaroenkij
The most effective performance of systems in industrial applications involving heat transfer processes corresponds to the least generation of entropy; that is, the rate of loss of useful work in a process is directly proportional to the rate of entropy production during that process.
Entropy analysis in MHD convective flow of Carreau fluid over a curved stretching surface with soret and dufour effects
Published in Numerical Heat Transfer, Part A: Applications, 2023
Sami Ul-Haq, Muhammad Bilal Ashraf
The second law of thermodynamics has been used to analysis the entropy generation. Entropy generation can determined the irreversibility of viscous dissipation, heat and mass transfer. Entropy is generated by a variety of processes, including heat and mass transmission, viscous dissipation, and other factors such as joule heating. Entropy production eliminates available energy in many industrial and engineering operations. Entropy generation minimization EGM helps us to find the growing rate of irreversibility in a system. It is necessary to reduce the irreversibility process to increase the energy conservation. Khan et al. [18] examined entropy production in magnetohydrodynamic viscid fluid along a curved surface. Hayat et al. [19] demonstrated the irreversibility in magnetohydrodynamic transport of nanofluid across a stretched surface. Afridi et al. [20] examined the irreversibility in magnetic field incorporated in viscous liquid due to curved sheet in the existence of joule heating and variable thermal conductivity. Revathi et al. [21] investigated the entropy minimization in MHD transport of a hybrid nanofluid along a curved sheet using a combination of activation energy and joule heating. Panigrahi et al. [22] discussed the influence of induced magnetic field with entropy generation.
Analysis of nonlinear thermal radiation and entropy on combined convective ternary (SWCNT-MWCNT-Fe3O4) Eyring–Powell nanoliquid flow over a slender cylinder
Published in Numerical Heat Transfer, Part A: Applications, 2023
Prabhugouda M. Patil, Hadapad F. Shankar
The study of entropy generation is imperative to know about the irreversibility of the thermal energy of a particular system according to the second law of thermodynamics. In most industrial and engineering processes, entropy production destroys the available energy in the system. Thus entropy generation is vital in determining the performance of thermal machines such as heat engines, power plants, heat pumps, refrigerators, and air conditioners. Due to this immense importance, it is essential to find the rate of entropy generated for a system to optimize the energy in the system for efficient operation. Now, from the second law of thermodynamics, the expression for the entropy generation of the system dealing with the steady Eyring nanofluid flow in the presence of thermal radiation, viscous is given by
Entropy generation in a third-grade hydromagnetic fluid of generalised Arrhenius two-step exothermic reaction with convective cooling
Published in International Journal of Ambient Energy, 2022
A. W. Ogunsola, R. A. Oderinu, A. D. Ohaegbue
Since the flow of heat in a fluid is irreversible, these create an obvious change in the entropy due to temperature difference, which causes disorderliness and reduced the system efficiency. Entropy production formulations have emerged as a dynamic topic of thermal engineering and sciences in recent years. This was motivated by the fact that many thermal processes occur at high temperatures. An increase in entropy reduces the system’s energy level, this is crucial for assessing the configuration’s effectiveness. The approach is based on pioneering work of (Bejan 1996) which changed the way engineering processes are thermally optimised and was extended to viscoelastic fluids by Aziz (2006), Ibanez, Cuevas, and de Haro (2003), Hassan and Gbadeyan (2015). Akbar (2015) carried out an investigation on the rate of entropy formation and energy conversion for a peristaltic flow in the presence of magnetic field. It was observed that changing the viscosity factor may alter the rate of entropy generation. Many flow configurations have been studied recently for the formation of entropy and irreversibility of heat in a system, as reported in Abolbashari et al. (2014), Daniel et al. (2017), Falade et al. (2016), Khan and Khan (2018), Salawu and Fatunmbi (2017). No matter a reaction, there are always some quantities of heat which are released to the environment and such process is known as combustion.