Thermodynamic Optimization

Awad, Mohamed M.; Muzychk, Y.S.

doi:10.5772/34711

Cited by 7 publications

(4 citation statements)

References 63 publications

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“…But none of the above works looked into the entropy generation; rather, many or all of these focus on the prediction of temperature, velocity profiles and parametric effects of these factors on the Nusselt number as well as friction factor. A comprehensive discussion on S gen and Be can be found in many literatures (Awad and Muzychka, 2012; Awad, 2015, 2016; Patil and Shashikanta, 2018; Patil et al., 2018, 2019; Gireesha and Sindhu, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effects of velocity, thermal and concentration slips on the entropy generation of nanofluid over an inclined sheet

Barik,

Rout,

Senapati

et al. 2024

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Purpose This paper aims at studying numerically the entropy generation of nanofluid flowing over an inclined sheet in the presence of external magnetic field, heat source/sink, chemical reaction along with slip boundary conditions imposed on an impermeable wall. Design/methodology/approach A suitable similarity transformation technique has been used to convert the coupled nonlinear partial differential equations to ordinary differential equations (ODEs). The ODEs are then solved simultaneously using the finite difference method implemented through an in-house computer program. The effects of different controlling parameters such as magnetic parameter, radiation parameter, Brownian motion parameter, thermophoresis parameter, chemical reaction parameter, Reynolds number, Brinkmann number, Prandtl number, velocity slip parameter, temperature slip parameter and the concentration slip parameter on the entropy generation and Bejan number have been discussed comprehensively through the relevant physical insights for the first time. Findings The relative strengths of the irreversibilities due to heat transfer, fluid friction and the mass diffusion arising due to the change in each of the controlling variables have been delineated both in the near-wall and far-away-wall regions, which may be helpful for a better understanding of the thermo-fluid dynamics of nanofluid in boundary layer flows. The numerical results obtained from the present study have also been validated with results published in open literature. Originality/value The effects of different controlling parameters such as magnetic parameter, radiation parameter, Brownian motion parameter, thermophoresis parameter, chemical reaction parameter, Reynolds number, Brinkmann number, Prandtl number, velocity slip parameter, temperature slip parameter and the concentration slip parameter on the entropy generation and Bejan number have been discussed comprehensively through the relevant physical insights for the first time.

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Section: Introductionmentioning

confidence: 99%

Effects of velocity, thermal and concentration slips on the entropy generation of nanofluid over an inclined sheet

Barik,

Rout,

Senapati

et al. 2024

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“…In the last few decades, various noncircular ducts have been used for enhancing the heat transfer characteristics and performance of compact heat exchangers. In enormous applications, such as heat exchangers, solar collectors, and several heat transfer applications, triangular ducts have been used due to their lower pressure drop across the entire length and lower maintenance …”

Section: Introductionmentioning

confidence: 99%

“…In enormous applications, such as heat exchangers, solar collectors, and several heat transfer applications, triangular ducts have been used due to their lower pressure drop across the entire length and lower maintenance. [1][2][3][4][5][6][7] Ahmed et al 8 carried out numerical and experimental investigations on triangular ducts using Al 2 O 3 and SiO 2 nanofluids and a turbulator in a laminar flow regime. It was concluded that the effect of turbulators and nanoparticles (NPs) in the fluid increased the performance index as the pressure drop increased.…”

Section: Introductionmentioning

confidence: 99%

Thermal and hydraulic characteristics of a triangular duct using an Al₂O₃ nanofluid in a turbulent flow regime

Taamneh

Kabeel

Prakash

et al. 2019

Heat Trans. Asian Res.

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This paper presents the computational analysis of convective heat transfer characteristics, pressure drop, and entropy generation characteristics of Al2O3/water nanofluids in a noncircular duct (triangular) using a single phase approach under a turbulent flow regime. The thermal and pressure drop characteristics of different concentrations of Al2O3 nanoparticles (NPs) and the analysis were carried out in Fluent software using a k‐ε approach under constant wall heat flux around the boundary. The results show that there is an increase in pressure drop and thereby an increase in friction by 20% for the smooth condition. The total pressure drop between the entry and exit section of the duct is increased to approximately 84.2% and 85.6% for a higher Reynolds number (Re = 10 000) compared with that of base fluid. Similarly, the entropy generation of water is increased by 40% as compared with 0.05% and 0.1% Al2O3 NPs. There is also a decrease in entropy generation identified while there is an increase in the Reynolds number. The convective heat transfer of 0.05% and 0.1% nanofluid has a similar trend with increased Reynolds number. The maximum performance is observed at the Reynolds number (Re = 4000) and found to be 1.29 for 0.1% concentration, whereas, the fluid at 0.05% is observed to be at 1.23. At a higher Reynolds number (Re = 10 000) the performance index decreased to approximately 1.19 and 1.25 for 0.05% and 0.1%, respectively.

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“…In AMRs, the structure and geometry of the solid matrix have to be optimized to reduce the thermal, viscous and magnetic losses and achieve the desired operating conditions of temperature span, cooling capacity and cycle efficiency. A concise review of applications of the method in the context of heat exchangers and storage systems was presented by Awad and Muzychka (2012). For passive regenerators (i.e., those without a magnetic-thermal interaction), several optimization procedures have been implemented (de Waele et al 1997, Das and Sahoo 1999, Steijaert 1999, Nam and Jeong 2006, Trevizoli and Barbosa 2015.…”

Section: Demagnetizationmentioning

confidence: 99%

Entropy Generation Minimization Analysis of Active Magnetic Regenerators

Trevizoli

Barbosa

2017

An. Acad. Bras. Ciênc.

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A performance assessment of active magnetocaloric regenerators using entropy generation minimization is presented. The model consists of the Brinkman-Forchheimer equation to describe the fluid flow and coupled energy equations for the fluid and solid phases. Entropy generation contributions due to axial heat conduction, fluid friction and interstitial heat transfer are considered. Based on the velocity and temperature profiles, local rates of entropy generation per unit volume were integrated to give the cycle-average entropy generation in the regenerator, which is the objective function of the optimization procedure. The solid matrix is a bed of gadolinium spherical particles and the working fluid is water. Performance evaluation criteria of fixed cross-section (face) area (FA) and variable geometry (VG) are incorporated into the optimization procedure to identify the most appropriate parameters and operating conditions under fixed constraints of specified temperature span and cooling capacity.

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Thermodynamic Optimization

Cited by 7 publications

References 63 publications

Effects of velocity, thermal and concentration slips on the entropy generation of nanofluid over an inclined sheet

Effects of velocity, thermal and concentration slips on the entropy generation of nanofluid over an inclined sheet

Thermal and hydraulic characteristics of a triangular duct using an Al₂O₃ nanofluid in a turbulent flow regime

Entropy Generation Minimization Analysis of Active Magnetic Regenerators

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Thermodynamic Optimization

Cited by 7 publications

References 63 publications

Effects of velocity, thermal and concentration slips on the entropy generation of nanofluid over an inclined sheet

Effects of velocity, thermal and concentration slips on the entropy generation of nanofluid over an inclined sheet

Thermal and hydraulic characteristics of a triangular duct using an Al2O3 nanofluid in a turbulent flow regime

Entropy Generation Minimization Analysis of Active Magnetic Regenerators

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Thermal and hydraulic characteristics of a triangular duct using an Al₂O₃ nanofluid in a turbulent flow regime