On inherent irreversibility in Sakiadis flow of nanofluids

Makinde, Oluwole Daniel; Khan, Waqar A.; Aziz, Ahmad Sukri Abd

doi:10.1504/ijex.2013.056131

Cited by 30 publications

(19 citation statements)

References 24 publications

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“…This renders an exergetic efficiency loss and results in reducing in the energy quality. In heat transfer processes, entropy generation has been reported in conduction [23][24][25] [26], convection [27][28][29], radiation [30] [31], and/or any combination of these modes of heat transfer [32] [33]. Further, there are other sources of irreversibilities such as viscous dissipation [27][28][29] and magnetic fields [34].…”

Section: Introductionmentioning

confidence: 99%

Entropy generation in thermal systems with solid structures – A concise review

Torabi

Zhang

Karimi

et al. 2016

International Journal of Heat and Mass Transfer

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Analysis of thermal systems on the basis of the second law of thermodynamics has recently gained considerable attention. This is, in part, due to the fact that this approach along with the powerful tools of entropy generation and exergy destruction provides a unique method for the analysis of a variety of systems encountered in science and engineering. Further, in recent years there has been a surge of interest in the thermal analysis of conductive media which include solid structures. In this work, the recent advances in the second law analyses of these systems are reviewed with an emphasis on the theoretical and modelling aspects. The effects of including solid components on the entropy generation within different thermal systems are first discussed. The mathematical methods used in this branch of thermodynamics are, then, reviewed. This is followed by the conclusions regarding the existing challenges and opportunities for further research.

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Section: Introductionmentioning

confidence: 99%

Entropy generation in thermal systems with solid structures – A concise review

Torabi

Zhang

Karimi

et al. 2016

International Journal of Heat and Mass Transfer

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“…Equation (19) shows that the Bejan number ranges from 0 to 1. The zero value of the Bejan number corresponds to the limit where the irreversibility is dominated by the effect of fluid friction while Be = 1 is the limit where the irreversibility due to heat transfer dominates the flow system.…”

Section: 1mentioning

confidence: 99%

“…Their results showed that the presence of nanoparticles is less effective in enhancement of the Nusselt number and in the reduction of the entropy generation. Makinde et al [19] numerically studied the entropy production and irreversibility due to flow and heat transfer of nanofluids over a moving flat surface. It was found that the entropy generation can be minimized by appropriate combination of parameter values together with nanoparticles volume fraction.…”

Section: Introductionmentioning

confidence: 99%

Second Law Analysis of Buoyancy Driven Unsteady Channel Flow of Nanofluids with Convective Cooling

Mkwizu¹

2015

ACM

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Abstract:We investigate the combined effects of buoyancy force and convective cooling on entropy generation in unsteady channel flow of water based nanofluids containing Copper (Cu) and Alumina (Al 2 O 3 ) as nanoparticles. Both first and second laws of thermodynamics are utilised to analyze the model problem. Using a semi discretization finite difference method together with Runge-Kutta Fehlberg integration scheme, the governing partial differential equations are solved numerically. Graphical results on the effects of parameter variation on velocity, temperature, skin friction, Nusselt number, entropy generation rate, irreversibility ratio and Bejan number are presented and discussed.

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“…There is no basis in physical science for interpreting entropy change as involving order and disorder. The original definition of entropy (change) involves a transfer of heat from a thermal reservoir to a system via a virtually reversible energy flow process (see Peters, 1995;Pakdemirli and Yilbas, 2006;Bianco et al, 2014;Lam and Arul Prakash, 2015;Akpinar and Kavak Akpinar, 2007;Abu-Nada, 2006;Adesanya and Makinde, 2014;Pitchandi, 2014;Makinde et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Entropy generation analysis for metachronal beating of ciliated Cu-water nanofluid with magnetic field

Akbar

Butt

2016

IJEX

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Abstract:In this paper, we have discussed the entropy generation on the ciliary motion of the peristaltic transport of fluids in human body. On the basis of the mathematical model of the copper nanofluids with pure water as the base fluid, the complete problem is analysed under the presence of heat transfer. It is considered that a group of cilia operate together and produce metachronal waves to transport the fluid. The governing flow equations are non-linear partial differential equations, which are reduced to ordinary differential equation form using the dimensionless variables. The investigation is carried out under the assumptions of low Reynold's number and long wavelength. Exact solutions of the fluid velocity, pressure gradient and temperature profile have been obtained. The obtained expressions are then described through graphs for various relevant parameters. Trapping phenomenon for nanoparticle volume fraction is presented at the end of the paper.

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On inherent irreversibility in Sakiadis flow of nanofluids

Cited by 30 publications

References 24 publications

Entropy generation in thermal systems with solid structures – A concise review

Entropy generation in thermal systems with solid structures – A concise review

Second Law Analysis of Buoyancy Driven Unsteady Channel Flow of Nanofluids with Convective Cooling

Entropy generation analysis for metachronal beating of ciliated Cu-water nanofluid with magnetic field

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