Variational entropy generation minimization of a channel flow: Convective heat transfer in a gas flow

Avellaneda, J.M.; Bataille, Françoise; Toutant, Adrien; Flamant, Gilles

doi:10.1016/j.ijheatmasstransfer.2020.120168

Cited by 17 publications

(6 citation statements)

References 49 publications

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“…The solution of ( 31) is ℎ 0 (𝑦) = 𝑒 −𝑆 𝑐 𝑣 0 𝑦 (32) We assume that ( 32) is a small perturbation to the solution of (31), that is ℎ 0 (𝑦) = 𝑒 −𝑆 𝑐 𝑣 0 𝑦 + 𝜀𝛾 0 (𝑦) + 𝑂(𝜀 2 ) (33) The function 𝛾 0 (𝑦) need to be determined. The initial condition for 𝛾 0 (𝑦) is found as follows ℎ 0 (0…”

Section: Mean Velocity Temperature and Chemical Speciementioning

confidence: 99%

“…The influence of fluid viscosity on the entropy generation due to turbulent pipe flow heated from the pipe wall at constant temperature is investigated by Al-Zaharnah and Yilbas [28]. Some other studies regarding entropy generation due to heat transfer and fluid flows under various conditions are presented by Abbas et al [29]; Tayebi et al [30]; Avellaneda et al [31]; Hayat et al [32]; Ramesh et al [33]; Waqas [34]; Khan et al [35]; Sahin [36,37]; and Makinde et al [38]).…”

Section: Introductionmentioning

confidence: 99%

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Entropy generation in unsteady MHD convective flow past a flat porous oscillating plate with suction or injection

Panya¹,

Akinyemi²,

Okedoye³

2023

Global J. Eng. Technol. Adv.

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In this study, Entropy generation in MHD convective flow past a flat porous oscillating plate with suction or injection are presented for an unsteady, one-dimensional flow of a viscous incompressible fluid. The importance of Entropy generation is noticed in industrial and scientific fields including heat transfer in thermal systems which includes viscous dissipation, chemical reaction, mass transfer, heat transfer, and electrical conduction etc. The role of flow parameters like magnetic parameter, Radiation parameters, Grashof number, Heat generation/absorption, irreversibility distribution ratio on entropy generation are presented and elaborated through graphs. The obtained results reveal that for various values of Hartmann number, the entropy generation and Bejan number are increased, a larger radiation parameter increases the entropy generation and the Entropy generation due to viscous irreversibility decreases with the increase in Grashof number and Hartmann number.

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Section: Mean Velocity Temperature and Chemical Speciementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Entropy generation in unsteady MHD convective flow past a flat porous oscillating plate with suction or injection

Panya¹,

Akinyemi²,

Okedoye³

2023

Global J. Eng. Technol. Adv.

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“…Previously, it has been extensively used for analysis of thermofluid systems. [31][32][33][34][35][36][37][38][39][40][41] In a recent study by Charoen-amornkitt et al 18 the authors used NET to describe entropy generation in a chemical reactor. The entropy production approach based on NET of physical processes at the interfaces has been applied for efficiency improvement in PEM fuel cells with porous electrodes.…”

Section: A Oxmentioning

confidence: 99%

A Numerical Simulation of Evolution Processes and Entropy Generation for Optimal Architecture of an Electrochemical Reaction-Diffusion System: Comparison of Two Optimization Strategies

Alizadeh,

Charoen-amornkitt,

Suzuki

et al. 2023

J. Electrochem. Soc.

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Employment of electrochemical energy devices is being expanded as the world is shifting toward more sustainable power resources. To meet the required cost efficiency standards for commercialization, there is a need for optimal design of the electrodes. In this study, a topology optimization method is proposed to increase the performance of an electrochemical reaction-diffusion system. A dimensionless model is developed to characterize the transport and rate processes in the system. Two optimization strategies are introduced to improve system performance using a heterogeneous distribution of constituents. In addition, an entropy generation model is proposed to evaluate the system irreversibilities quantitatively. The findings show that the system performance could be enhanced up to 116.7% with an optimal tree-root-like structure. Such a heterogeneous material distribution provides a balance among various competing transport and rate processes. The proposed methodology could be employed in optimal design of electrodes for various electrochemical devices. This study also offers a fundamental comprehension of optimal designs by showing the connection between the optimal designs and the entropy generation. It is revealed that a less dissipating system corresponds to a more uniform current and entropy generation. Some recommendations are also made in choosing a proper optimization approach for electrochemical systems.

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“…Some studies about entropy rate are mentioned in Refs. [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48].…”

Section: : Introductionmentioning

confidence: 99%

Mathematical modeling and numerical computation for the entropy based radiated hybrid (Polyethylene glycol+Water/Zirconium dioxide+Magnesium oxide) nanofluid flow

Alzahrani

Khan

Eldin

2022

Preprint

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The objective of this article is to discuss the entropy rate in spinning nanofluid (PEG-H2O/ZrO2) and hybrid (PEG-H2O/ZrO2-MgO) nanofluid subject to stretched surface. Here mixture of water (H2O) and polyethylene glycol (C2nH4n + 2On+1) are used as base fluid. Zirconium dioxide (ZrO2) and magnesium oxide (MgO) are considered as nanoparticles. Heat expression is modeled by implementation of heat flux, heat source and viscous dissipation. Furthermore, the entropy generation problem is addressed by second law of thermodynamics. Nonlinear dimensionless differentials systems are developed by suitable variables. The given dimensionless systems are solved by using numerical technique (ND-solve method). Effects of influential variables on fluid flow, temperature, Bejan number and entropy rate for both (PEG-H2O/ZrO2) and (PEG-H2O/ZrO2-MgO) fluids are graphically examined. Higher approximation of volume fractions rises the velocity profile, while reverse impact seen for Bejan number. An increment in rotation variable corresponds to boosts up velocity. A similar scenario is seen for thermal field and entropy rate through radiation effect. An opposite impact is seen for Bejan number and entropy rate through Brinkman number. An augmentation in temperature is seen for Eckert number. Furthermore, we noticed that heat transport in hybrid nanofluid (PEG-H2O/ZrO2-MgO) is higher than compared to nanofluid (PEG-H2O/ZrO2).

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Variational entropy generation minimization of a channel flow: Convective heat transfer in a gas flow

Cited by 17 publications

References 49 publications

Entropy generation in unsteady MHD convective flow past a flat porous oscillating plate with suction or injection

Entropy generation in unsteady MHD convective flow past a flat porous oscillating plate with suction or injection

A Numerical Simulation of Evolution Processes and Entropy Generation for Optimal Architecture of an Electrochemical Reaction-Diffusion System: Comparison of Two Optimization Strategies

Mathematical modeling and numerical computation for the entropy based radiated hybrid (Polyethylene glycol+Water/Zirconium dioxide+Magnesium oxide) nanofluid flow

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