Comments on “Evaluation of entropy generation with thermal radiation on MHD Carreau fluid stream past a wedge”

Purpose This study aims to investigate the irreversibility associated with the Fe3O4–Co/kerosene hybrid-nanofluid past a wedge with nonlinear radiation and heat source. Design/methodology/approach This study reports the numerical analysis of the hybrid nanofluid model under the implications of the heat source and magnetic field over a static and moving wedge with slips. The second law of thermodynamics is applied with nonlinear thermal radiation. The system that comprises differential equations of partial derivatives is remodeled into the system of differential equations via similarity transformations and then solved through the Runge–Kutta–Fehlberg with shooting technique. The physical parameters, which emerges from the derived system, are discussed in graphical formats. Excellent proficiency in the numerical process is analyzed by comparing the results with available literature in limiting scenarios. Findings The significant outcomes of the current investigation are that the velocity field uplifts for higher velocity slip and magnetic strength. Further, the heat transfer rate is reduced with the incremental values of the Eckert number, while it uplifts with thermal slip and radiation parameters. An increase in Brinkmann’s number uplifts the entropy generation rate, while that peters out the Bejan number. The results of this study are of importance involving in the assessment of the effect of some important design parameters on heat transfer and, consequently, on the optimization of industrial processes. Originality/value This study is original work that reports the hybrid nanofluid model of Fe3O4–Co/kerosene.

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Thermal transport of hybrid nanofluids with entropy generation: A numerical simulation

International Journal of Modern Physics B ◽

10.1142/s0217979221502180 ◽

2021 ◽

pp. 2150218

Author(s):

Hassan Waqas ◽

Faisal Fareed Bukhari ◽

Taseer Muhammad ◽

Umar Farooq

Keyword(s):

Thermal Conductivity ◽

Thermal Radiation ◽

Entropy Generation ◽

Industrial Process ◽

Velocity Slip ◽

Variable Thermal Conductivity ◽

Process Improvements ◽

Radiation Entropy ◽

Hybrid Nanofluids ◽

Nonlinear Pattern

In this research, thermal radiation, entropy generation and variable thermal conductivity effects on hybrid nanofluids by moving sheet are analyzed. The liquid is placed by stretchable flat wall that is flowing in a nonlinear pattern. Thermal conductivity changes with temperature governed by thermal radiation and MHD is incorporated. Approximations of boundary layer correspond to a set of PDEs which are then changed into ODEs by considering suitable variables. The resulting ODEs are solved using the bvp4c method. The implication with considerable physical characteristics on temperature, entropy generation and velocity profile is graphically represented and numerically discussed. Entropy generation increases for increasing Reynolds number, velocity slip parameter, Brinkman number and magnetic parameter. Scientists have recently established a rising interest in the importance of nanoparticles due to their numerous technical, industrial and commercial uses. The provided insights can be used in extrusion application areas, macromolecules, biomimetic systems, energy production and industrial process improvements.

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Entropy Generation for a Mixed Convection Nanofluid Flow in an Inclined Channel Filled with Porous Medium with Thermal Radiation

Mathematical Modeling and Computational Tools - Springer Proceedings in Mathematics & Statistics ◽

10.1007/978-981-15-3615-1_12 ◽

2020 ◽

pp. 171-190

Author(s):

Lalrinpuia Tlau ◽

Surender Ontela

Keyword(s):

Porous Medium ◽

Mixed Convection ◽

Thermal Radiation ◽

Entropy Generation ◽

Nanofluid Flow ◽

Inclined Channel

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Entropy generation optimisation in the nanofluid flow of a second grade fluid with nonlinear thermal radiation

Pramana ◽

10.1007/s12043-019-1809-0 ◽

2019 ◽

Vol 93 (4) ◽

Cited By ~ 4

Author(s):

Tasawar Hayat ◽

Mehreen Kanwal ◽

Sumaira Qayyum ◽

M Ijaz Khan ◽

Ahmed Alsaedi

Keyword(s):

Thermal Radiation ◽

Entropy Generation ◽

Second Grade ◽

Nonlinear Thermal Radiation ◽

Second Grade Fluid ◽

Nanofluid Flow ◽

Grade Fluid

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Time, Irreversibility and Entropy Production in Nonequilibrium Systems

Entropy ◽

10.3390/e22080887 ◽

2020 ◽

Vol 22 (8) ◽

pp. 887 ◽

Cited By ~ 1

Author(s):

Umberto Lucia ◽

Giulia Grisolia ◽

Alexander L. Kuzemsky

Keyword(s):

Thermal Radiation ◽

Entropy Production ◽

Entropy Generation ◽

Temporal Evolution ◽

Nonequilibrium Systems ◽

Time Irreversibility ◽

Shed Light

The aim of this review is to shed light on time and irreversibility, in order to link macroscopic to microscopic approaches to these complicated problems. After a brief summary of the standard notions of thermodynamics, we introduce some considerations about certain fundamental aspects of temporal evolution of out-of-equilibrium systems. Our focus is on the notion of entropy generation as the marked characteristic of irreversible behaviour. The concept of time and the basic aspects of the thermalization of thermal radiation, due to the interaction of thermal radiation with matter, are explored concisely from complementary perspectives. The implications and relevance of time for the phenomenon of thermal radiation and irreversible thermophysics are carefully discussed. The concept of time is treated from a different viewpoint, in order to make it as clear as possible in relation to its different fundamental problems.

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